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James Orlando (Former Employee)

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Delta wetland near Rio Vista, California.

High-frequency Monitoring of Delta Island Drainage Waters

From the second half of the 19th century, land reclamation has transformed the Sacramento-San Joaquin Delta (Delta). The landscape of the Delta has gone from a network of shifting waterways and tidal marshland to channels and islands fixed in position by hardened levees.
By
Ecosystems Mission Area, Water Resources Mission Area, National Water Quality Program, Water Availability and Use Science Program, California Water Science Center
High-frequency Monitoring of Delta Island Drainage Waters

High-frequency Monitoring of Delta Island Drainage Waters

From the second half of the 19th century, land reclamation has transformed the Sacramento-San Joaquin Delta (Delta). The landscape of the Delta has gone from a network of shifting waterways and tidal marshland to channels and islands fixed in position by hardened levees.
Learn More
Picture of a agriculture field in California

Neonicotinoid Seed Treatment Study

Neonicotinoids are a new class of insecticides chemically related to nicotine. Like nicotine, they act on receptors in the nerves and are generally much more toxic to insects, than they are to mammals and other higher organisms. Their use has increased rapidly over the last decade, driven in large part by their use for seed coating. Seed coating is when a seed is treated with an insecticide prior...
By
California Water Science Center
Neonicotinoid Seed Treatment Study

Neonicotinoid Seed Treatment Study

Neonicotinoids are a new class of insecticides chemically related to nicotine. Like nicotine, they act on receptors in the nerves and are generally much more toxic to insects, than they are to mammals and other higher organisms. Their use has increased rapidly over the last decade, driven in large part by their use for seed coating. Seed coating is when a seed is treated with an insecticide prior...
Learn More
Satellite view showing locations of sites sampled during study.

Occurrence of Current-use Pesticides in Suisun Bay and Potential Effects on Phytoplankton

Suisun Bay is an area identified as critical habitat for the threatened Delta Smelt. Several important changes in the pelagic food web of this area have been documented over the last two decades indicating that food for Delta Smelt and other threatened fishes is in short.
By
California Water Science Center
Occurrence of Current-use Pesticides in Suisun Bay and Potential Effects on Phytoplankton

Occurrence of Current-use Pesticides in Suisun Bay and Potential Effects on Phytoplankton

Suisun Bay is an area identified as critical habitat for the threatened Delta Smelt. Several important changes in the pelagic food web of this area have been documented over the last two decades indicating that food for Delta Smelt and other threatened fishes is in short.
Learn More
map showing pesticide study area

Pesticide Studies in the Sacramento/San Joaquin Delta and San Francisco Bay Estuary

The objectives of this specific study are to characterize the mixtures of current-use pesticides and pesticide degradates entering the Sacramento/San Joaquin Delta from its two main river sources over a period of 12 consecutive months.
By
California Water Science Center, San Francisco Bay and Sacramento-San Joaquin Delta Estuary
Pesticide Studies in the Sacramento/San Joaquin Delta and San Francisco Bay Estuary

Pesticide Studies in the Sacramento/San Joaquin Delta and San Francisco Bay Estuary

The objectives of this specific study are to characterize the mixtures of current-use pesticides and pesticide degradates entering the Sacramento/San Joaquin Delta from its two main river sources over a period of 12 consecutive months.
Learn More
Map showing sampling site locations in the Yolo Bypass

Pesticide Occurrence in California – Yolo Bypass Pesticide Analyses

The project is part of an overarching Interagency Ecological Program (IEP)/Department of Water Resources (DWR) study that is focused on understanding the processes by which the Yolo Bypass may provide a fall food web supply for the Cache Slough Complex and downstream regions of the Sacramento/San Joaquin Delta. Several studies conducted since 2011 have shown that phytoplankton blooms can be...
By
California Water Science Center
Pesticide Occurrence in California – Yolo Bypass Pesticide Analyses

Pesticide Occurrence in California – Yolo Bypass Pesticide Analyses

The project is part of an overarching Interagency Ecological Program (IEP)/Department of Water Resources (DWR) study that is focused on understanding the processes by which the Yolo Bypass may provide a fall food web supply for the Cache Slough Complex and downstream regions of the Sacramento/San Joaquin Delta. Several studies conducted since 2011 have shown that phytoplankton blooms can be...
Learn More
proposed locations in the Delta region

Delta Regional Monitoring Program: Current-use Pesticides

This study will utilize the unique analytical capabilities of the USGS Pesticide Fate Research Group (PFRG), Organic Chemistry Research Laboratory (OCRL) to assess the occurrence of a large suite of understudied, current-use pesticides and pesticide degradates in surface waters entering the Sacramento/San Joaquin Delta.
By
California Water Science Center
Delta Regional Monitoring Program: Current-use Pesticides

Delta Regional Monitoring Program: Current-use Pesticides

This study will utilize the unique analytical capabilities of the USGS Pesticide Fate Research Group (PFRG), Organic Chemistry Research Laboratory (OCRL) to assess the occurrence of a large suite of understudied, current-use pesticides and pesticide degradates in surface waters entering the Sacramento/San Joaquin Delta.
Learn More
Map showing approximate sampling locations.

Coordinated Pesticide Reconnaissance Study of Surface Waters in California

Pesticides are used throughout the State of California in both urban and agricultural settings and are routinely detected in surface water. Each year, new pesticides are introduced to the market and often become detected in surface water. It can take several years or more for routine monitoring programs to acquire the capability to detect new and understudied pesticides of concern because...
By
California Water Science Center
Coordinated Pesticide Reconnaissance Study of Surface Waters in California

Coordinated Pesticide Reconnaissance Study of Surface Waters in California

Pesticides are used throughout the State of California in both urban and agricultural settings and are routinely detected in surface water. Each year, new pesticides are introduced to the market and often become detected in surface water. It can take several years or more for routine monitoring programs to acquire the capability to detect new and understudied pesticides of concern because...
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USGS

Pesticides in Suspended Sediment of the Alamo and New Rivers

Previous studies have detected current-use pesticides and DDT metabolites in water and suspended sediments from the Alamo and New Rivers. Additional studies have found water samples from both rivers to be toxic to aquatic organisms in laboratory bioassays, and implicated certain current-use pesticides as the source of this toxicity. Recent requirements under the Clean Water Act for the Regional...
By
California Water Science Center
Pesticides in Suspended Sediment of the Alamo and New Rivers

Pesticides in Suspended Sediment of the Alamo and New Rivers

Previous studies have detected current-use pesticides and DDT metabolites in water and suspended sediments from the Alamo and New Rivers. Additional studies have found water samples from both rivers to be toxic to aquatic organisms in laboratory bioassays, and implicated certain current-use pesticides as the source of this toxicity. Recent requirements under the Clean Water Act for the Regional...
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A yellow crop duster lets fall a cloud of spray on a cotton crop

Pesticide Fate Research Group (PFRG)

Pesticides are used in both agricultural and urban settings to manage unwanted plants, insects, fungi, and other pests. However, these substances and their breakdown products can move beyond their intended application sites through various means, ending up in areas where they weren't meant to be. This movement can happen via the air, through water (both surface and groundwater), and by sticking to...
By
California Water Science Center, Organic Chemistry Research Laboratory
Pesticide Fate Research Group (PFRG)

Pesticide Fate Research Group (PFRG)

Pesticides are used in both agricultural and urban settings to manage unwanted plants, insects, fungi, and other pests. However, these substances and their breakdown products can move beyond their intended application sites through various means, ending up in areas where they weren't meant to be. This movement can happen via the air, through water (both surface and groundwater), and by sticking to...
Learn More
Filter Total Items: 15

Concurrent Occurrence of Pesticides and Per- and Polyfluoroalkyl Substances (PFAS) in Agricultural Streams in California, USA Concurrent Occurrence of Pesticides and Per- and Polyfluoroalkyl Substances (PFAS) in Agricultural Streams in California, USA

Per-and polyfluoroalkyl substances (PFAS) are frequently found in streams, with most research focusing on urban sources of PFAS to surface water (e.g., firefighting foams, industrial releases, and wastewater treatment plant discharges). Pesticide applications are an under-investigated source of PFAS to streams in both agricultural and urban areas. There are few studies that analyze the...
By
California Water Science Center

Pesticide Concentrations Measured in Zooplankton Samples Collected from the Sacramento River, Yolo Bypass, and Cache Slough Region, California, 2024 Pesticide Concentrations Measured in Zooplankton Samples Collected from the Sacramento River, Yolo Bypass, and Cache Slough Region, California, 2024

Zooplankton samples were collected in the summer/fall of 2024 at multiple sites in the Sacramento River, Yolo Bypass, and Cache Slough Region of California and analyzed for a suite of 160 current-use pesticides and pesticide degradates by the U.S. Geological Survey Organic Chemistry Research Laboratory. Samples were collected at two sites in the Bypass, at a comparison site on the...
By
California Water Science Center

6PPD-quinone concentrations in the Sacramento-San Joaquin Delta, California, 2018-2024 6PPD-quinone concentrations in the Sacramento-San Joaquin Delta, California, 2018-2024

The Sacramento-San Joaquin Delta is a crucial river delta that supplies a significant portion of California's freshwater for agricultural and residential use and serves as critical habitat for numerous state and federally listed species of concern. In several areas, urban stormwater drains discharge directly into the Delta. 6PPD-quinone (6PPD-Q, 2-anilo-5-[(4-methylpentan-2- yl)amino...
By
California Water Science Center

Pesticide Concentrations Measured in Zooplankton Samples Collected from the Sacramento River, Yolo Bypass, and Cache Slough Region, California, 2022 and 2023 Pesticide Concentrations Measured in Zooplankton Samples Collected from the Sacramento River, Yolo Bypass, and Cache Slough Region, California, 2022 and 2023

Zooplankton samples were collected in the summer/fall of 2022 and 2023 at multiple sites in the Sacramento River, Yolo Bypass, and Cache Slough Region of California and analyzed for a suite of 160 current-use pesticides and pesticide degradates by the U.S. Geological Survey Organic Chemistry Research Laboratory. In 2022 samples were collected at two sites in the Bypass and at a...
By
California Water Science Center

Geochemical data for water, sediment, and biota in areas affected by historical mining, northwestern Sierra Nevada and Trinity Mountains, California Geochemical data for water, sediment, and biota in areas affected by historical mining, northwestern Sierra Nevada and Trinity Mountains, California

This dataset includes data for water, sediment, and biota samples collected at 250 locations in the northwestern Sierra Nevada and the Trinity Mountains during 1999–2012. The locations were chosen to assess potential effects from historical mining, with a focus primarily on mercury contamination associated with placer gold mines in the Sierra Nevada and the Trinity Mountains, and a hard...
By
California Water Science Center

Pesticide Concentrations Measured in Zooplankton Samples Collected from the Sacramento River and Yolo Bypass, California, 2021 Pesticide Concentrations Measured in Zooplankton Samples Collected from the Sacramento River and Yolo Bypass, California, 2021

Zooplankton samples were collected at one site upstream of the Yolo Bypass in Northern California, three sites within the Bypass, and at a comparison site on the Sacramento River below the city of Sacramento and analyzed for a large suite of current-use pesticides and degradates. Samples were collected every two weeks from early August 2021 to mid-October 2021. Samples were collected by...
By
California Water Science Center

Pesticide Concentrations Measured in Zooplankton Samples Collected from the Sacramento River and Yolo Bypass, California, 2017-2020 Pesticide Concentrations Measured in Zooplankton Samples Collected from the Sacramento River and Yolo Bypass, California, 2017-2020

Zooplankton samples were collected at a site in the Yolo Bypass in Northern California and at a comparison site on the Sacramento River below the city of Sacramento and analyzed for a large suite of current-use pesticides and degradates. Samples were collected biweekly in the summer/fall 2017 and 2018, and from May 2019-March 2020. Samples were collected by towing a 150-micron conical...
By
California Water Science Center

Shallow Sediment Geochemistry in a Mercury-Contaminated Multi-Habitat Floodplain: Cache Creek Settling Basin, Yolo County, California (version 2.0, August 2021) Shallow Sediment Geochemistry in a Mercury-Contaminated Multi-Habitat Floodplain: Cache Creek Settling Basin, Yolo County, California (version 2.0, August 2021)

The Cache Creek Settling Basin (CCSB) is a 13.3 km2 leveed basin located at the terminal drainage of the Cache Creek watershed, immediately NE of the town of Woodland (Yolo County), California and approximately 18 km NW of Sacramento, California. The basin was constructed by the U.S. Army Corps of Engineers (completed in 1937 and modified in 1993) for the purpose of trapping suspended...
By
Water Resources Mission Area

Update of the Mineral Resources Data System for California including Mineral Deposit Types Update of the Mineral Resources Data System for California including Mineral Deposit Types

There are more than 42,000 entries in the USGS Mineral Resources Data System (MRDS) for the State of California. Previously, the field for deposit type was sparsely populated, which made it difficult to evaluate mine sites needing environmental remediation. This has been rectified by populating the deposit type field using 100 deposit types cited in previous USGS publications, and 137...
By
California Water Science Center

Pesticide detections in streams throughout the foothills of the Sierra Nevada range using passive samplers from 2017 to 2019 Pesticide detections in streams throughout the foothills of the Sierra Nevada range using passive samplers from 2017 to 2019

This dataset was produced from analyzing Affinisep SDB-RPS, Affinisep HLB, and Restek Resprep C18 disks that were deployed with the use of Chemcatcher� passive sampling devices. Silicone bands were also deployed and used for exploring economical methods of sampling for pesticides in surface water. Sampling assemblies were deployed in streams throughout the foothills of the Sierra Nevada...
By
California Water Science Center

Insecticide and fungicide concentrations in irrigation runoff and soils from a lettuce field in the Salinas Valley, California, 2019 and 2020 Insecticide and fungicide concentrations in irrigation runoff and soils from a lettuce field in the Salinas Valley, California, 2019 and 2020

Irrigation runoff and soil samples were collected from a lettuce field located at the USDA-ARS Spence Research farm in the Salinas Valley, California to measure neonicotinoid insecticides (clothianidin and imidacloprid) and a fungicide (azoxystrobin) applied via coated seed and drench treatments. The field trial was designed to evaluate four treatments with replication: 1) control...
By
California Water Science Center

Pesticide concentrations in surface waters of the Sacramento Valley rice-growing regions, 2010 Pesticide concentrations in surface waters of the Sacramento Valley rice-growing regions, 2010

Surface water samples were collected from four stream/agricultural drain sites in the Sacramento Valley of California to measure pesticides commonly applied to rice. Samples were collected weekly from May through August 2010 to capture the rice pesticide application season. Water samples were filtered (0.7 ?m) and extracted via solid-phase extraction. Additionally, the filter paper was...
By
California Water Science Center
USGS scientist collecting water samples from an amphibian monitoring site
USGS scientist collecting water samples from an amphibian monitoring
USGS scientist collecting water samples from an amphibian monitoring
USGS scientist collecting water samples from an amphibian monitoring site

USGS scientist collecting water samples from an amphibian monitoring

USGS scientist collecting water samples from an amphibian monitoring

USGS scientist collecting water samples from an amphibian monitoring site in Livermore, California.

By
Toxic Substances Hydrology, Contaminant Biology, Environmental Health Program, California Water Science Center, Western Ecological Research Center (WERC)
USGS scientist collecting water samples from an amphibian monitoring site

USGS scientist collecting water samples from an amphibian monitoring

USGS scientist collecting water samples from an amphibian monitoring

USGS scientist collecting water samples from an amphibian monitoring site in Livermore, California.

By
Toxic Substances Hydrology, Contaminant Biology, Environmental Health Program, California Water Science Center, Western Ecological Research Center (WERC)
Image: USGS Scientist Collect Water Samples
USGS Scientist Collect Water Samples
USGS Scientist Collect Water Samples
Image: USGS Scientist Collect Water Samples

USGS Scientist Collect Water Samples

USGS Scientist Collect Water Samples

USGS scientist collecting water samples for pesticide analysis at Woodward Resevoir Pond near Oakdale, California.

By
Contaminant Biology, Toxic Substances Hydrology, Environmental Health Program, Communications and Publishing
Image: USGS Scientist Collect Water Samples

USGS Scientist Collect Water Samples

USGS Scientist Collect Water Samples

USGS scientist collecting water samples for pesticide analysis at Woodward Resevoir Pond near Oakdale, California.

By
Contaminant Biology, Toxic Substances Hydrology, Environmental Health Program, Communications and Publishing
USGS scientist dissecting a summer flounder
USGS scientist dissecting a summer flounder
USGS scientist dissecting a summer flounder
USGS scientist dissecting a summer flounder

USGS scientist dissecting a summer flounder

USGS scientist dissecting a summer flounder

USGS scientist dissecting a summer flounder.  Science Feature that the image was used on was Pesticides Common in California Estuary

 

By
Toxic Substances Hydrology, Contaminant Biology, Environmental Health Program
USGS scientist dissecting a summer flounder

USGS scientist dissecting a summer flounder

USGS scientist dissecting a summer flounder

USGS scientist dissecting a summer flounder.  Science Feature that the image was used on was Pesticides Common in California Estuary

 

By
Toxic Substances Hydrology, Contaminant Biology, Environmental Health Program
Filter Total Items: 51

Effects of flow on pesticides in water and zooplankton in the northern Sacramento-San Joaquin Delta Effects of flow on pesticides in water and zooplankton in the northern Sacramento-San Joaquin Delta

Zooplankton are a key food source for juvenile fishes in estuaries worldwide, including California’s Sacramento–San Joaquin Delta (hereafter Delta); both zooplankton quality and quantity are critical to ecosystem health. Zooplankton may be affected by pesticides in water and the food web, and the Delta is known to contain complex pesticide mixtures. In this study, we evaluated pesticide
Authors
James Orlando, Laura Twardochleb, David Bosworth, Michelle Hladik, Corey Sanders, Matt De Parsia, Brittany E. Davis
By
California Water Science Center

Environmental characteristics of select managed ponds in the Sacramento–San Joaquin Delta—Implications for native fish conservation and research Environmental characteristics of select managed ponds in the Sacramento–San Joaquin Delta—Implications for native fish conservation and research

The use of wetlands to support native fish research and conservation efforts in the Sacramento–San Joaquin Delta (Delta) of California is a growing priority. The purpose of our study was to examine the physiochemical and biological characteristics of select managed ponds in the Delta to determine if they would be suitable habitats for research involving the conservation of delta smelt...
Authors
Frederick V. Feyrer, Shawn Acuña, Jordan M. Buxton, Ethan R. Enos, Michelle L. Hladik, James Orlando, Matthew J. Young
By
California Water Science Center

6PPD-quinone in water from the San Francisco-San Joaquin Delta, California, 2018-2024 6PPD-quinone in water from the San Francisco-San Joaquin Delta, California, 2018-2024

The Sacramento-San Joaquin Delta (Delta) is an expansive river delta supplying a large portion of California’s fresh water for agriculture and residential use, and it is also an area of critical habitat for numerous state and federally listed species of concern. In many locations, urban stormwater flows directly into the Delta. 6PPD-quinone (6PPD-Q), an ozonation byproduct of a tire...
Authors
Gabrielle Pecora Black, Matthew D. De Parsia, Matthew Uychutin, Rachael F. Lane, James Orlando, Michelle L. Hladik
By
Central Plains Water Science Center, California Water Science Center

Pesticide concentrations of surface water and suspended sediment in Yolo By-Pass and Cache Slough Complex, California, 2019–2021 Pesticide concentrations of surface water and suspended sediment in Yolo By-Pass and Cache Slough Complex, California, 2019–2021

Managed flow pulses in the north Sacramento-San Joaquin Delta are an adaptive management tool used in efforts to enhance food availability in delta smelt (Hypomesus transpacificus) habitat as part of the North Delta Food Subsidies Action. The California Department of Water Resources (DWR) monitors non-managed seasonal and local flow pulses and managed flow pulses from agricultural...
Authors
Matthew Uychutin, James L. Orlando, Michelle L. Hladik, Corey J. Sanders, Michael S. Gross, Matthew D. De Parsia, Elisabeth M. LaBarbera, Laura Twardochleb, Brittany E. Davis
By
Water Resources Mission Area, California Water Science Center

Assessing the presence of current-use pesticides in mid-elevation Sierra Nevada streams using passive samplers, California, 2018–19 Assessing the presence of current-use pesticides in mid-elevation Sierra Nevada streams using passive samplers, California, 2018–19

Passive sampler devices were deployed in six northern California streams five times between November 2018 and December 2019 to measure the presence or absence of current-use pesticides in surface water. In the targeted areas, there are reported pesticide uses for agriculture, commercial forestry, and rights of way maintenance along with unreported pesticide use at private residences and...
Authors
Matthew D. De Parsia, James L. Orlando, Michelle L. Hladik
By
Water Resources Mission Area, California Water Science Center

Comparing imidacloprid, clothianidin, and azoxystrobin runoff from lettuce fields using a soil drench or treated seeds in the Salinas Valley, California Comparing imidacloprid, clothianidin, and azoxystrobin runoff from lettuce fields using a soil drench or treated seeds in the Salinas Valley, California

Neonicotinoid insecticide use has increased over the last decade, including as agricultural seed treatments (application of chemical in a coating to the seed prior to planting). In California, multiple crops, including lettuce, can be grown using neonicotinoid treated seeds or receive a direct neonicotinoid soil application (drenching) at planting. Using research plots, this study...
Authors
Emily Woodward, Michelle Hladik, Anson Main, Michael Cahn, James Orlando, Jennifer Teerlink
By
Water Resources Mission Area, California Water Science Center

Pesticide concentrations associated with augmented flow pulses in the Yolo Bypass and Cache Slough Complex, California Pesticide concentrations associated with augmented flow pulses in the Yolo Bypass and Cache Slough Complex, California

Surface-water and suspended-sediment samples were collected and analyzed by the U.S. Geological Survey for multiple current-use pesticides and pesticide degradates approximately every 2 weeks at up to five sites in the Yolo Bypass and Cache Slough Complex before, during, and after augmented flow pulses in summer and fall 2016 and 2018 as well as during ambient flow conditions in summer...
Authors
James L. Orlando, Matt De Parsia, Corey J. Sanders, Michelle L. Hladik, Jared Frantzich
By
Water Resources Mission Area, California Water Science Center

Pesticide mixtures in the Sacramento–San Joaquin Delta, 2016–17: Results from year 2 of the Delta Regional Monitoring Program Pesticide mixtures in the Sacramento–San Joaquin Delta, 2016–17: Results from year 2 of the Delta Regional Monitoring Program

The Delta Regional Monitoring Program was developed by the Central Valley Regional Water Quality Control Board in response to the decline of pelagic fish species in the Sacramento–San Joaquin Delta that was observed in the early 2000s. The U.S. Geological Survey, in cooperation with the Delta Regional Monitoring Program, has been responsible for collecting and analyzing surface-water...
Authors
Matthew D. De Parsia, Emily E. Woodward, James L. Orlando, Michelle L. Hladik
By
Water Resources Mission Area, California Water Science Center

Review of and recommendations for monitoring contaminants and their effects in the San Francisco Bay−Delta Review of and recommendations for monitoring contaminants and their effects in the San Francisco Bay−Delta

Legacy and current-use contaminants enter into and accumulate throughout the San Francisco Bay−Delta (Bay−Delta), and are present at concentrations with known effects on species important to this diverse watershed. There remains major uncertainty and a lack of focused research able to address and provide understanding of effects across multiple biological scales, despite previous and...
Authors
Richard E Connon, Simone Hasenbein, Susanne M. Brander, Helen C. Poynton, Erika B Holland, Daniel Schlenk, James Orlando, Michelle L. Hladik, Tracy K. Collier, Nathaniel L Scholz, John P Incardona, Nancy D. Denslow, Amro Hamdoun, Sascha Nicklisch, Natalia Garcia-Reyero, Edward J. Perkins, Evan P Gallagher, Xin Deng, Dan Wang, Stephanie Fong, Richard S Breuer, Mehrdad Hajibabei, James B Brown, John K Colbourne, Thomas M Young, Gary Cherr, Andrew Whitehead, Anne E. Todgham
By
Water Resources Mission Area, California Water Science Center

Spatial variability of phytoplankton in a shallow tidal freshwater system reveals complex controls on abundance and community structure Spatial variability of phytoplankton in a shallow tidal freshwater system reveals complex controls on abundance and community structure

Estuaries worldwide are undergoing changes to patterns of aquatic productivity because of human activities that alter flow, impact sediment delivery and thus the light field, and contribute nutrients and contaminants like pesticides and metals. These changes can influence phytoplankton communities, which in turn can alter estuarine food webs. We used multiple approaches-including high...
Authors
Elizabeth B. Stumpner, Brian A. Bergamaschi, Tamara E. C. Kraus, Alexander Parker, Francis Wilkerson, Bryan D. Downing, Richard Dugdale, Michael T. Murrell, Kurt D. Carpenter, James Orlando, Carol Kendall
By
Water Resources Mission Area, California Water Science Center, Oregon Water Science Center

Reconnaissance of mixed organic and inorganic chemicals in private and public supply tapwaters at selected residential and workplace sites in the United States Reconnaissance of mixed organic and inorganic chemicals in private and public supply tapwaters at selected residential and workplace sites in the United States

Safe drinking water at the point-of-use (tapwater, TW) is a United States public health priority. Multiple lines of evidence were used to evaluate potential human health concerns of 482 organics and 19 inorganics in TW from 13 (7 public supply, 6 private well self-supply) home and 12 (public supply) workplace locations in 11 states. Only uranium (61.9 μg L–1, private well) exceeded a...
Authors
Paul M. Bradley, Dana W. Kolpin, Kristin M. Romanok, Kelly L. Smalling, Michael J. Focazio, Juliane B. Brown, Mary C. Cardon, Kurt D. Carpenter, Steven R. Corsi, Laura A. DeCicco, Julie E. Dietze, Nicola Evans, Edward T. Furlong, Carrie E. Givens, James L. Gray, Dale W. Griffin, Christopher P. Higgins, Michelle L. Hladik, Luke R. Iwanowicz, Celeste A. Journey, Kathryn Kuivila, Jason R. Masoner, Carrie A. McDonough, Michael T. Meyer, James L. Orlando, Mark J. Strynar, Christopher P. Weis, Vickie S. Wilson
By
Ecosystems Mission Area, Water Resources Mission Area, Contaminant Biology, Environmental Health Program, Toxic Substances Hydrology, Central Plains Water Science Center, California Water Science Center, Central Midwest Water Science Center, Colorado Water Science Center, Eastern Ecological Science Center, New Jersey Water Science Center, Oregon Water Science Center, South Atlantic Water Science Center (SAWSC), St. Petersburg Coastal and Marine Science Center, Upper Midwest Environmental Sciences Center, Upper Midwest Water Science Center, National Water Quality Laboratory

Dissolved pesticide concentrations in the lower Sacramento River and its source waters, California, 2016 Dissolved pesticide concentrations in the lower Sacramento River and its source waters, California, 2016

As part of a collaborative study designed to better understand water-quality conditions in the Sacramento River, surface-water samples were collected from the lower Sacramento River and five of its tributaries and then analyzed by the U.S. Geological Survey for a suite of 162 current-use pesticides and pesticide degradates. Samples were collected in May and October 2016 at 16 sites on...
Authors
Sean M. Stout, James L. Orlando, Megan McWayne-Holmes, Corey Sanders, Michelle L. Hladik
By
Water Resources Mission Area, California Water Science Center

Legacy Mercury Contamination from Historical Gold Mining Legacy Mercury Contamination from Historical Gold Mining

To understand the contamination caused by historic mining in California, researchers sampled sediment, water, and biota (animals) during the years 1999–2004 and 2011–2012. From the data collected, a set of interactive maps were produced. The maps, along with the data release and introductory video, explain the results of the research.
By
California Water Science Center

Science and Products

Delta wetland near Rio Vista, California.

High-frequency Monitoring of Delta Island Drainage Waters

From the second half of the 19th century, land reclamation has transformed the Sacramento-San Joaquin Delta (Delta). The landscape of the Delta has gone from a network of shifting waterways and tidal marshland to channels and islands fixed in position by hardened levees.
By
Ecosystems Mission Area, Water Resources Mission Area, National Water Quality Program, Water Availability and Use Science Program, California Water Science Center
High-frequency Monitoring of Delta Island Drainage Waters

High-frequency Monitoring of Delta Island Drainage Waters

From the second half of the 19th century, land reclamation has transformed the Sacramento-San Joaquin Delta (Delta). The landscape of the Delta has gone from a network of shifting waterways and tidal marshland to channels and islands fixed in position by hardened levees.
Learn More
Picture of a agriculture field in California

Neonicotinoid Seed Treatment Study

Neonicotinoids are a new class of insecticides chemically related to nicotine. Like nicotine, they act on receptors in the nerves and are generally much more toxic to insects, than they are to mammals and other higher organisms. Their use has increased rapidly over the last decade, driven in large part by their use for seed coating. Seed coating is when a seed is treated with an insecticide prior...
By
California Water Science Center
Neonicotinoid Seed Treatment Study

Neonicotinoid Seed Treatment Study

Neonicotinoids are a new class of insecticides chemically related to nicotine. Like nicotine, they act on receptors in the nerves and are generally much more toxic to insects, than they are to mammals and other higher organisms. Their use has increased rapidly over the last decade, driven in large part by their use for seed coating. Seed coating is when a seed is treated with an insecticide prior...
Learn More
Satellite view showing locations of sites sampled during study.

Occurrence of Current-use Pesticides in Suisun Bay and Potential Effects on Phytoplankton

Suisun Bay is an area identified as critical habitat for the threatened Delta Smelt. Several important changes in the pelagic food web of this area have been documented over the last two decades indicating that food for Delta Smelt and other threatened fishes is in short.
By
California Water Science Center
Occurrence of Current-use Pesticides in Suisun Bay and Potential Effects on Phytoplankton

Occurrence of Current-use Pesticides in Suisun Bay and Potential Effects on Phytoplankton

Suisun Bay is an area identified as critical habitat for the threatened Delta Smelt. Several important changes in the pelagic food web of this area have been documented over the last two decades indicating that food for Delta Smelt and other threatened fishes is in short.
Learn More
map showing pesticide study area

Pesticide Studies in the Sacramento/San Joaquin Delta and San Francisco Bay Estuary

The objectives of this specific study are to characterize the mixtures of current-use pesticides and pesticide degradates entering the Sacramento/San Joaquin Delta from its two main river sources over a period of 12 consecutive months.
By
California Water Science Center, San Francisco Bay and Sacramento-San Joaquin Delta Estuary
Pesticide Studies in the Sacramento/San Joaquin Delta and San Francisco Bay Estuary

Pesticide Studies in the Sacramento/San Joaquin Delta and San Francisco Bay Estuary

The objectives of this specific study are to characterize the mixtures of current-use pesticides and pesticide degradates entering the Sacramento/San Joaquin Delta from its two main river sources over a period of 12 consecutive months.
Learn More
Map showing sampling site locations in the Yolo Bypass

Pesticide Occurrence in California – Yolo Bypass Pesticide Analyses

The project is part of an overarching Interagency Ecological Program (IEP)/Department of Water Resources (DWR) study that is focused on understanding the processes by which the Yolo Bypass may provide a fall food web supply for the Cache Slough Complex and downstream regions of the Sacramento/San Joaquin Delta. Several studies conducted since 2011 have shown that phytoplankton blooms can be...
By
California Water Science Center
Pesticide Occurrence in California – Yolo Bypass Pesticide Analyses

Pesticide Occurrence in California – Yolo Bypass Pesticide Analyses

The project is part of an overarching Interagency Ecological Program (IEP)/Department of Water Resources (DWR) study that is focused on understanding the processes by which the Yolo Bypass may provide a fall food web supply for the Cache Slough Complex and downstream regions of the Sacramento/San Joaquin Delta. Several studies conducted since 2011 have shown that phytoplankton blooms can be...
Learn More
proposed locations in the Delta region

Delta Regional Monitoring Program: Current-use Pesticides

This study will utilize the unique analytical capabilities of the USGS Pesticide Fate Research Group (PFRG), Organic Chemistry Research Laboratory (OCRL) to assess the occurrence of a large suite of understudied, current-use pesticides and pesticide degradates in surface waters entering the Sacramento/San Joaquin Delta.
By
California Water Science Center
Delta Regional Monitoring Program: Current-use Pesticides

Delta Regional Monitoring Program: Current-use Pesticides

This study will utilize the unique analytical capabilities of the USGS Pesticide Fate Research Group (PFRG), Organic Chemistry Research Laboratory (OCRL) to assess the occurrence of a large suite of understudied, current-use pesticides and pesticide degradates in surface waters entering the Sacramento/San Joaquin Delta.
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Map showing approximate sampling locations.

Coordinated Pesticide Reconnaissance Study of Surface Waters in California

Pesticides are used throughout the State of California in both urban and agricultural settings and are routinely detected in surface water. Each year, new pesticides are introduced to the market and often become detected in surface water. It can take several years or more for routine monitoring programs to acquire the capability to detect new and understudied pesticides of concern because...
By
California Water Science Center
Coordinated Pesticide Reconnaissance Study of Surface Waters in California

Coordinated Pesticide Reconnaissance Study of Surface Waters in California

Pesticides are used throughout the State of California in both urban and agricultural settings and are routinely detected in surface water. Each year, new pesticides are introduced to the market and often become detected in surface water. It can take several years or more for routine monitoring programs to acquire the capability to detect new and understudied pesticides of concern because...
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USGS

Pesticides in Suspended Sediment of the Alamo and New Rivers

Previous studies have detected current-use pesticides and DDT metabolites in water and suspended sediments from the Alamo and New Rivers. Additional studies have found water samples from both rivers to be toxic to aquatic organisms in laboratory bioassays, and implicated certain current-use pesticides as the source of this toxicity. Recent requirements under the Clean Water Act for the Regional...
By
California Water Science Center
Pesticides in Suspended Sediment of the Alamo and New Rivers

Pesticides in Suspended Sediment of the Alamo and New Rivers

Previous studies have detected current-use pesticides and DDT metabolites in water and suspended sediments from the Alamo and New Rivers. Additional studies have found water samples from both rivers to be toxic to aquatic organisms in laboratory bioassays, and implicated certain current-use pesticides as the source of this toxicity. Recent requirements under the Clean Water Act for the Regional...
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A yellow crop duster lets fall a cloud of spray on a cotton crop

Pesticide Fate Research Group (PFRG)

Pesticides are used in both agricultural and urban settings to manage unwanted plants, insects, fungi, and other pests. However, these substances and their breakdown products can move beyond their intended application sites through various means, ending up in areas where they weren't meant to be. This movement can happen via the air, through water (both surface and groundwater), and by sticking to...
By
California Water Science Center, Organic Chemistry Research Laboratory
Pesticide Fate Research Group (PFRG)

Pesticide Fate Research Group (PFRG)

Pesticides are used in both agricultural and urban settings to manage unwanted plants, insects, fungi, and other pests. However, these substances and their breakdown products can move beyond their intended application sites through various means, ending up in areas where they weren't meant to be. This movement can happen via the air, through water (both surface and groundwater), and by sticking to...
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Filter Total Items: 15

Concurrent Occurrence of Pesticides and Per- and Polyfluoroalkyl Substances (PFAS) in Agricultural Streams in California, USA Concurrent Occurrence of Pesticides and Per- and Polyfluoroalkyl Substances (PFAS) in Agricultural Streams in California, USA

Per-and polyfluoroalkyl substances (PFAS) are frequently found in streams, with most research focusing on urban sources of PFAS to surface water (e.g., firefighting foams, industrial releases, and wastewater treatment plant discharges). Pesticide applications are an under-investigated source of PFAS to streams in both agricultural and urban areas. There are few studies that analyze the...
By
California Water Science Center

Pesticide Concentrations Measured in Zooplankton Samples Collected from the Sacramento River, Yolo Bypass, and Cache Slough Region, California, 2024 Pesticide Concentrations Measured in Zooplankton Samples Collected from the Sacramento River, Yolo Bypass, and Cache Slough Region, California, 2024

Zooplankton samples were collected in the summer/fall of 2024 at multiple sites in the Sacramento River, Yolo Bypass, and Cache Slough Region of California and analyzed for a suite of 160 current-use pesticides and pesticide degradates by the U.S. Geological Survey Organic Chemistry Research Laboratory. Samples were collected at two sites in the Bypass, at a comparison site on the...
By
California Water Science Center

6PPD-quinone concentrations in the Sacramento-San Joaquin Delta, California, 2018-2024 6PPD-quinone concentrations in the Sacramento-San Joaquin Delta, California, 2018-2024

The Sacramento-San Joaquin Delta is a crucial river delta that supplies a significant portion of California's freshwater for agricultural and residential use and serves as critical habitat for numerous state and federally listed species of concern. In several areas, urban stormwater drains discharge directly into the Delta. 6PPD-quinone (6PPD-Q, 2-anilo-5-[(4-methylpentan-2- yl)amino...
By
California Water Science Center

Pesticide Concentrations Measured in Zooplankton Samples Collected from the Sacramento River, Yolo Bypass, and Cache Slough Region, California, 2022 and 2023 Pesticide Concentrations Measured in Zooplankton Samples Collected from the Sacramento River, Yolo Bypass, and Cache Slough Region, California, 2022 and 2023

Zooplankton samples were collected in the summer/fall of 2022 and 2023 at multiple sites in the Sacramento River, Yolo Bypass, and Cache Slough Region of California and analyzed for a suite of 160 current-use pesticides and pesticide degradates by the U.S. Geological Survey Organic Chemistry Research Laboratory. In 2022 samples were collected at two sites in the Bypass and at a...
By
California Water Science Center

Geochemical data for water, sediment, and biota in areas affected by historical mining, northwestern Sierra Nevada and Trinity Mountains, California Geochemical data for water, sediment, and biota in areas affected by historical mining, northwestern Sierra Nevada and Trinity Mountains, California

This dataset includes data for water, sediment, and biota samples collected at 250 locations in the northwestern Sierra Nevada and the Trinity Mountains during 1999–2012. The locations were chosen to assess potential effects from historical mining, with a focus primarily on mercury contamination associated with placer gold mines in the Sierra Nevada and the Trinity Mountains, and a hard...
By
California Water Science Center

Pesticide Concentrations Measured in Zooplankton Samples Collected from the Sacramento River and Yolo Bypass, California, 2021 Pesticide Concentrations Measured in Zooplankton Samples Collected from the Sacramento River and Yolo Bypass, California, 2021

Zooplankton samples were collected at one site upstream of the Yolo Bypass in Northern California, three sites within the Bypass, and at a comparison site on the Sacramento River below the city of Sacramento and analyzed for a large suite of current-use pesticides and degradates. Samples were collected every two weeks from early August 2021 to mid-October 2021. Samples were collected by...
By
California Water Science Center

Pesticide Concentrations Measured in Zooplankton Samples Collected from the Sacramento River and Yolo Bypass, California, 2017-2020 Pesticide Concentrations Measured in Zooplankton Samples Collected from the Sacramento River and Yolo Bypass, California, 2017-2020

Zooplankton samples were collected at a site in the Yolo Bypass in Northern California and at a comparison site on the Sacramento River below the city of Sacramento and analyzed for a large suite of current-use pesticides and degradates. Samples were collected biweekly in the summer/fall 2017 and 2018, and from May 2019-March 2020. Samples were collected by towing a 150-micron conical...
By
California Water Science Center

Shallow Sediment Geochemistry in a Mercury-Contaminated Multi-Habitat Floodplain: Cache Creek Settling Basin, Yolo County, California (version 2.0, August 2021) Shallow Sediment Geochemistry in a Mercury-Contaminated Multi-Habitat Floodplain: Cache Creek Settling Basin, Yolo County, California (version 2.0, August 2021)

The Cache Creek Settling Basin (CCSB) is a 13.3 km2 leveed basin located at the terminal drainage of the Cache Creek watershed, immediately NE of the town of Woodland (Yolo County), California and approximately 18 km NW of Sacramento, California. The basin was constructed by the U.S. Army Corps of Engineers (completed in 1937 and modified in 1993) for the purpose of trapping suspended...
By
Water Resources Mission Area

Update of the Mineral Resources Data System for California including Mineral Deposit Types Update of the Mineral Resources Data System for California including Mineral Deposit Types

There are more than 42,000 entries in the USGS Mineral Resources Data System (MRDS) for the State of California. Previously, the field for deposit type was sparsely populated, which made it difficult to evaluate mine sites needing environmental remediation. This has been rectified by populating the deposit type field using 100 deposit types cited in previous USGS publications, and 137...
By
California Water Science Center

Pesticide detections in streams throughout the foothills of the Sierra Nevada range using passive samplers from 2017 to 2019 Pesticide detections in streams throughout the foothills of the Sierra Nevada range using passive samplers from 2017 to 2019

This dataset was produced from analyzing Affinisep SDB-RPS, Affinisep HLB, and Restek Resprep C18 disks that were deployed with the use of Chemcatcher� passive sampling devices. Silicone bands were also deployed and used for exploring economical methods of sampling for pesticides in surface water. Sampling assemblies were deployed in streams throughout the foothills of the Sierra Nevada...
By
California Water Science Center

Insecticide and fungicide concentrations in irrigation runoff and soils from a lettuce field in the Salinas Valley, California, 2019 and 2020 Insecticide and fungicide concentrations in irrigation runoff and soils from a lettuce field in the Salinas Valley, California, 2019 and 2020

Irrigation runoff and soil samples were collected from a lettuce field located at the USDA-ARS Spence Research farm in the Salinas Valley, California to measure neonicotinoid insecticides (clothianidin and imidacloprid) and a fungicide (azoxystrobin) applied via coated seed and drench treatments. The field trial was designed to evaluate four treatments with replication: 1) control...
By
California Water Science Center

Pesticide concentrations in surface waters of the Sacramento Valley rice-growing regions, 2010 Pesticide concentrations in surface waters of the Sacramento Valley rice-growing regions, 2010

Surface water samples were collected from four stream/agricultural drain sites in the Sacramento Valley of California to measure pesticides commonly applied to rice. Samples were collected weekly from May through August 2010 to capture the rice pesticide application season. Water samples were filtered (0.7 ?m) and extracted via solid-phase extraction. Additionally, the filter paper was...
By
California Water Science Center
USGS scientist collecting water samples from an amphibian monitoring site
USGS scientist collecting water samples from an amphibian monitoring
USGS scientist collecting water samples from an amphibian monitoring
USGS scientist collecting water samples from an amphibian monitoring site

USGS scientist collecting water samples from an amphibian monitoring

USGS scientist collecting water samples from an amphibian monitoring

USGS scientist collecting water samples from an amphibian monitoring site in Livermore, California.

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Toxic Substances Hydrology, Contaminant Biology, Environmental Health Program, California Water Science Center, Western Ecological Research Center (WERC)
USGS scientist collecting water samples from an amphibian monitoring site

USGS scientist collecting water samples from an amphibian monitoring

USGS scientist collecting water samples from an amphibian monitoring

USGS scientist collecting water samples from an amphibian monitoring site in Livermore, California.

By
Toxic Substances Hydrology, Contaminant Biology, Environmental Health Program, California Water Science Center, Western Ecological Research Center (WERC)
Image: USGS Scientist Collect Water Samples
USGS Scientist Collect Water Samples
USGS Scientist Collect Water Samples
Image: USGS Scientist Collect Water Samples

USGS Scientist Collect Water Samples

USGS Scientist Collect Water Samples

USGS scientist collecting water samples for pesticide analysis at Woodward Resevoir Pond near Oakdale, California.

By
Contaminant Biology, Toxic Substances Hydrology, Environmental Health Program, Communications and Publishing
Image: USGS Scientist Collect Water Samples

USGS Scientist Collect Water Samples

USGS Scientist Collect Water Samples

USGS scientist collecting water samples for pesticide analysis at Woodward Resevoir Pond near Oakdale, California.

By
Contaminant Biology, Toxic Substances Hydrology, Environmental Health Program, Communications and Publishing
USGS scientist dissecting a summer flounder
USGS scientist dissecting a summer flounder
USGS scientist dissecting a summer flounder
USGS scientist dissecting a summer flounder

USGS scientist dissecting a summer flounder

USGS scientist dissecting a summer flounder

USGS scientist dissecting a summer flounder.  Science Feature that the image was used on was Pesticides Common in California Estuary

 

By
Toxic Substances Hydrology, Contaminant Biology, Environmental Health Program
USGS scientist dissecting a summer flounder

USGS scientist dissecting a summer flounder

USGS scientist dissecting a summer flounder

USGS scientist dissecting a summer flounder.  Science Feature that the image was used on was Pesticides Common in California Estuary

 

By
Toxic Substances Hydrology, Contaminant Biology, Environmental Health Program
Filter Total Items: 51

Effects of flow on pesticides in water and zooplankton in the northern Sacramento-San Joaquin Delta Effects of flow on pesticides in water and zooplankton in the northern Sacramento-San Joaquin Delta

Zooplankton are a key food source for juvenile fishes in estuaries worldwide, including California’s Sacramento–San Joaquin Delta (hereafter Delta); both zooplankton quality and quantity are critical to ecosystem health. Zooplankton may be affected by pesticides in water and the food web, and the Delta is known to contain complex pesticide mixtures. In this study, we evaluated pesticide
Authors
James Orlando, Laura Twardochleb, David Bosworth, Michelle Hladik, Corey Sanders, Matt De Parsia, Brittany E. Davis
By
California Water Science Center

Environmental characteristics of select managed ponds in the Sacramento–San Joaquin Delta—Implications for native fish conservation and research Environmental characteristics of select managed ponds in the Sacramento–San Joaquin Delta—Implications for native fish conservation and research

The use of wetlands to support native fish research and conservation efforts in the Sacramento–San Joaquin Delta (Delta) of California is a growing priority. The purpose of our study was to examine the physiochemical and biological characteristics of select managed ponds in the Delta to determine if they would be suitable habitats for research involving the conservation of delta smelt...
Authors
Frederick V. Feyrer, Shawn Acuña, Jordan M. Buxton, Ethan R. Enos, Michelle L. Hladik, James Orlando, Matthew J. Young
By
California Water Science Center

6PPD-quinone in water from the San Francisco-San Joaquin Delta, California, 2018-2024 6PPD-quinone in water from the San Francisco-San Joaquin Delta, California, 2018-2024

The Sacramento-San Joaquin Delta (Delta) is an expansive river delta supplying a large portion of California’s fresh water for agriculture and residential use, and it is also an area of critical habitat for numerous state and federally listed species of concern. In many locations, urban stormwater flows directly into the Delta. 6PPD-quinone (6PPD-Q), an ozonation byproduct of a tire...
Authors
Gabrielle Pecora Black, Matthew D. De Parsia, Matthew Uychutin, Rachael F. Lane, James Orlando, Michelle L. Hladik
By
Central Plains Water Science Center, California Water Science Center

Pesticide concentrations of surface water and suspended sediment in Yolo By-Pass and Cache Slough Complex, California, 2019–2021 Pesticide concentrations of surface water and suspended sediment in Yolo By-Pass and Cache Slough Complex, California, 2019–2021

Managed flow pulses in the north Sacramento-San Joaquin Delta are an adaptive management tool used in efforts to enhance food availability in delta smelt (Hypomesus transpacificus) habitat as part of the North Delta Food Subsidies Action. The California Department of Water Resources (DWR) monitors non-managed seasonal and local flow pulses and managed flow pulses from agricultural...
Authors
Matthew Uychutin, James L. Orlando, Michelle L. Hladik, Corey J. Sanders, Michael S. Gross, Matthew D. De Parsia, Elisabeth M. LaBarbera, Laura Twardochleb, Brittany E. Davis
By
Water Resources Mission Area, California Water Science Center

Assessing the presence of current-use pesticides in mid-elevation Sierra Nevada streams using passive samplers, California, 2018–19 Assessing the presence of current-use pesticides in mid-elevation Sierra Nevada streams using passive samplers, California, 2018–19

Passive sampler devices were deployed in six northern California streams five times between November 2018 and December 2019 to measure the presence or absence of current-use pesticides in surface water. In the targeted areas, there are reported pesticide uses for agriculture, commercial forestry, and rights of way maintenance along with unreported pesticide use at private residences and...
Authors
Matthew D. De Parsia, James L. Orlando, Michelle L. Hladik
By
Water Resources Mission Area, California Water Science Center

Comparing imidacloprid, clothianidin, and azoxystrobin runoff from lettuce fields using a soil drench or treated seeds in the Salinas Valley, California Comparing imidacloprid, clothianidin, and azoxystrobin runoff from lettuce fields using a soil drench or treated seeds in the Salinas Valley, California

Neonicotinoid insecticide use has increased over the last decade, including as agricultural seed treatments (application of chemical in a coating to the seed prior to planting). In California, multiple crops, including lettuce, can be grown using neonicotinoid treated seeds or receive a direct neonicotinoid soil application (drenching) at planting. Using research plots, this study...
Authors
Emily Woodward, Michelle Hladik, Anson Main, Michael Cahn, James Orlando, Jennifer Teerlink
By
Water Resources Mission Area, California Water Science Center

Pesticide concentrations associated with augmented flow pulses in the Yolo Bypass and Cache Slough Complex, California Pesticide concentrations associated with augmented flow pulses in the Yolo Bypass and Cache Slough Complex, California

Surface-water and suspended-sediment samples were collected and analyzed by the U.S. Geological Survey for multiple current-use pesticides and pesticide degradates approximately every 2 weeks at up to five sites in the Yolo Bypass and Cache Slough Complex before, during, and after augmented flow pulses in summer and fall 2016 and 2018 as well as during ambient flow conditions in summer...
Authors
James L. Orlando, Matt De Parsia, Corey J. Sanders, Michelle L. Hladik, Jared Frantzich
By
Water Resources Mission Area, California Water Science Center

Pesticide mixtures in the Sacramento–San Joaquin Delta, 2016–17: Results from year 2 of the Delta Regional Monitoring Program Pesticide mixtures in the Sacramento–San Joaquin Delta, 2016–17: Results from year 2 of the Delta Regional Monitoring Program

The Delta Regional Monitoring Program was developed by the Central Valley Regional Water Quality Control Board in response to the decline of pelagic fish species in the Sacramento–San Joaquin Delta that was observed in the early 2000s. The U.S. Geological Survey, in cooperation with the Delta Regional Monitoring Program, has been responsible for collecting and analyzing surface-water...
Authors
Matthew D. De Parsia, Emily E. Woodward, James L. Orlando, Michelle L. Hladik
By
Water Resources Mission Area, California Water Science Center

Review of and recommendations for monitoring contaminants and their effects in the San Francisco Bay−Delta Review of and recommendations for monitoring contaminants and their effects in the San Francisco Bay−Delta

Legacy and current-use contaminants enter into and accumulate throughout the San Francisco Bay−Delta (Bay−Delta), and are present at concentrations with known effects on species important to this diverse watershed. There remains major uncertainty and a lack of focused research able to address and provide understanding of effects across multiple biological scales, despite previous and...
Authors
Richard E Connon, Simone Hasenbein, Susanne M. Brander, Helen C. Poynton, Erika B Holland, Daniel Schlenk, James Orlando, Michelle L. Hladik, Tracy K. Collier, Nathaniel L Scholz, John P Incardona, Nancy D. Denslow, Amro Hamdoun, Sascha Nicklisch, Natalia Garcia-Reyero, Edward J. Perkins, Evan P Gallagher, Xin Deng, Dan Wang, Stephanie Fong, Richard S Breuer, Mehrdad Hajibabei, James B Brown, John K Colbourne, Thomas M Young, Gary Cherr, Andrew Whitehead, Anne E. Todgham
By
Water Resources Mission Area, California Water Science Center

Spatial variability of phytoplankton in a shallow tidal freshwater system reveals complex controls on abundance and community structure Spatial variability of phytoplankton in a shallow tidal freshwater system reveals complex controls on abundance and community structure

Estuaries worldwide are undergoing changes to patterns of aquatic productivity because of human activities that alter flow, impact sediment delivery and thus the light field, and contribute nutrients and contaminants like pesticides and metals. These changes can influence phytoplankton communities, which in turn can alter estuarine food webs. We used multiple approaches-including high...
Authors
Elizabeth B. Stumpner, Brian A. Bergamaschi, Tamara E. C. Kraus, Alexander Parker, Francis Wilkerson, Bryan D. Downing, Richard Dugdale, Michael T. Murrell, Kurt D. Carpenter, James Orlando, Carol Kendall
By
Water Resources Mission Area, California Water Science Center, Oregon Water Science Center

Reconnaissance of mixed organic and inorganic chemicals in private and public supply tapwaters at selected residential and workplace sites in the United States Reconnaissance of mixed organic and inorganic chemicals in private and public supply tapwaters at selected residential and workplace sites in the United States

Safe drinking water at the point-of-use (tapwater, TW) is a United States public health priority. Multiple lines of evidence were used to evaluate potential human health concerns of 482 organics and 19 inorganics in TW from 13 (7 public supply, 6 private well self-supply) home and 12 (public supply) workplace locations in 11 states. Only uranium (61.9 μg L–1, private well) exceeded a...
Authors
Paul M. Bradley, Dana W. Kolpin, Kristin M. Romanok, Kelly L. Smalling, Michael J. Focazio, Juliane B. Brown, Mary C. Cardon, Kurt D. Carpenter, Steven R. Corsi, Laura A. DeCicco, Julie E. Dietze, Nicola Evans, Edward T. Furlong, Carrie E. Givens, James L. Gray, Dale W. Griffin, Christopher P. Higgins, Michelle L. Hladik, Luke R. Iwanowicz, Celeste A. Journey, Kathryn Kuivila, Jason R. Masoner, Carrie A. McDonough, Michael T. Meyer, James L. Orlando, Mark J. Strynar, Christopher P. Weis, Vickie S. Wilson
By
Ecosystems Mission Area, Water Resources Mission Area, Contaminant Biology, Environmental Health Program, Toxic Substances Hydrology, Central Plains Water Science Center, California Water Science Center, Central Midwest Water Science Center, Colorado Water Science Center, Eastern Ecological Science Center, New Jersey Water Science Center, Oregon Water Science Center, South Atlantic Water Science Center (SAWSC), St. Petersburg Coastal and Marine Science Center, Upper Midwest Environmental Sciences Center, Upper Midwest Water Science Center, National Water Quality Laboratory

Dissolved pesticide concentrations in the lower Sacramento River and its source waters, California, 2016 Dissolved pesticide concentrations in the lower Sacramento River and its source waters, California, 2016

As part of a collaborative study designed to better understand water-quality conditions in the Sacramento River, surface-water samples were collected from the lower Sacramento River and five of its tributaries and then analyzed by the U.S. Geological Survey for a suite of 162 current-use pesticides and pesticide degradates. Samples were collected in May and October 2016 at 16 sites on...
Authors
Sean M. Stout, James L. Orlando, Megan McWayne-Holmes, Corey Sanders, Michelle L. Hladik
By
Water Resources Mission Area, California Water Science Center

Legacy Mercury Contamination from Historical Gold Mining Legacy Mercury Contamination from Historical Gold Mining

To understand the contamination caused by historic mining in California, researchers sampled sediment, water, and biota (animals) during the years 1999–2004 and 2011–2012. From the data collected, a set of interactive maps were produced. The maps, along with the data release and introductory video, explain the results of the research.
By
California Water Science Center
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