USGS Technician Jonathan Cohl servicing an in-situ continuous water quality multi-parameter sonde (YSI 6920 V2-2) at 01408000 Manasquan River at Squankum, New Jersey to calculate fouling and drift to apply corrections to multiple time series for real-time data.
Molly Schreiner
Molly is a Hydrologist working with the New Jersey Water Science Center Water-Quality Processes Team with a strong foundation of water quality and is with the Environmental Health Program focusing on human and animal health and the ecosystems they share through water quality data.
Molly started her career with USGS in 2012 as a Hydrologic Technician and primarily focused on surface and ground water quality, with an emphasis on data collection and refinement of emerging contaminant sampling techniques. Additionally, Molly has experience with ecological assessments, storm-response sediment/water data collection, continuous water quality monitors, and groundwater level collection. She is motivated by collaboration with peers and upholding the integrity to gather the highest caliber of data to strengthen reliable scientific conclusions.
Science and Products
Per and Polyfluoroalkyl Substances (PFAS) in New Jersey Waters
In vitro bioactivity results analyzed in private, public, and bottled drinking-water samples, 2016-20 In vitro bioactivity results analyzed in private, public, and bottled drinking-water samples, 2016-20
Water quality and contaminants in stream surface waters collected in the Delmarva Peninsula, 2022 (ver. 1.1, June 2026) Water quality and contaminants in stream surface waters collected in the Delmarva Peninsula, 2022 (ver. 1.1, June 2026)
Per- and polyfluoroalkyl substances (PFAS) concentration results in the Wanaque, Ramapo, Pompton, and Passaic River watersheds, New Jersey 2025 Per- and polyfluoroalkyl substances (PFAS) concentration results in the Wanaque, Ramapo, Pompton, and Passaic River watersheds, New Jersey 2025
Concentration results for inorganic constituents in discrete tapwater samples, Montana, 2024. Concentration results for inorganic constituents in discrete tapwater samples, Montana, 2024.
Target chemical concentrations of mixed-organic compounds and microbiological indicators in tapwater, Montana, 2024 Target chemical concentrations of mixed-organic compounds and microbiological indicators in tapwater, Montana, 2024
Concentration results for per- and polyfluoroalkyl substances (PFAS) analyzed in fish tissue, bed sediment, and biofilm samples, Montana, 2023 Concentration results for per- and polyfluoroalkyl substances (PFAS) analyzed in fish tissue, bed sediment, and biofilm samples, Montana, 2023
Water quality and contaminants in stream surface waters collected in Southeast Pennsylvania and Maryland Piedmont mixed agriculture, 2023 (ver. 1.1, June 2026) Water quality and contaminants in stream surface waters collected in Southeast Pennsylvania and Maryland Piedmont mixed agriculture, 2023 (ver. 1.1, June 2026)
Contaminants in bed sediment from surface waters collected in the Chesapeake Bay Watershed, 2021-24 (ver. 1.1, June 2026). Contaminants in bed sediment from surface waters collected in the Chesapeake Bay Watershed, 2021-24 (ver. 1.1, June 2026).
Per- and polyfluoroalkyl substances (PFAS) results in tapwater samples, in select areas within the United States, beginning 2023 (ver. 2.0, June 2025) Per- and polyfluoroalkyl substances (PFAS) results in tapwater samples, in select areas within the United States, beginning 2023 (ver. 2.0, June 2025)
Nutrient and trace element results for the U.S. Geological Survey vernal ponds study, Pleasant Grove, New Jersey, 2022-23 Nutrient and trace element results for the U.S. Geological Survey vernal ponds study, Pleasant Grove, New Jersey, 2022-23
Quarterly sample results for per- and polyfluoroalkyl substances (PFAS) for locations in Campbell, Wisconsin, 2021-24 (ver. 2.0, March 2025) Quarterly sample results for per- and polyfluoroalkyl substances (PFAS) for locations in Campbell, Wisconsin, 2021-24 (ver. 2.0, March 2025)
Organic and inorganic constituents in surface water and native and non-native fish and frog health data collected from streams, impoundments and wetlands in the New Jersey Pinelands, 2017-2020 (ver. 1.1, August 2022) Organic and inorganic constituents in surface water and native and non-native fish and frog health data collected from streams, impoundments and wetlands in the New Jersey Pinelands, 2017-2020 (ver. 1.1, August 2022)
USGS Technician Jonathan Cohl servicing an in-situ continuous water quality multi-parameter sonde (YSI 6920 V2-2) at 01408000 Manasquan River at Squankum, New Jersey to calculate fouling and drift to apply corrections to multiple time series for real-time data.
Tapwater contaminant mixtures and cumulative risk screening on the Crow (Apsáalooke) Reservation Tapwater contaminant mixtures and cumulative risk screening on the Crow (Apsáalooke) Reservation
Comparative screening of private, public, and bottled drinking water in vitro bioactivity Comparative screening of private, public, and bottled drinking water in vitro bioactivity
Understanding the occurrence and distribution of per- and polyfluoroalkyl substances (PFAS) in surface waters of the nontidal Passaic River Basin Understanding the occurrence and distribution of per- and polyfluoroalkyl substances (PFAS) in surface waters of the nontidal Passaic River Basin
Per- and polyfluoroalkyl substances (PFAS) and other contaminants of concern in tribal waters of Montana Per- and polyfluoroalkyl substances (PFAS) and other contaminants of concern in tribal waters of Montana
Tapwater-contaminant mixtures and risk in a biofuel-facility impacted private-well community Tapwater-contaminant mixtures and risk in a biofuel-facility impacted private-well community
Tapwater exposures, residential risk, and mitigation in a PFAS-impacted-groundwater community Tapwater exposures, residential risk, and mitigation in a PFAS-impacted-groundwater community
Public, bottled, and private drinking water: Shared contaminant-mixture exposures and effects challenge Public, bottled, and private drinking water: Shared contaminant-mixture exposures and effects challenge
Science and Products
Per and Polyfluoroalkyl Substances (PFAS) in New Jersey Waters
In vitro bioactivity results analyzed in private, public, and bottled drinking-water samples, 2016-20 In vitro bioactivity results analyzed in private, public, and bottled drinking-water samples, 2016-20
Water quality and contaminants in stream surface waters collected in the Delmarva Peninsula, 2022 (ver. 1.1, June 2026) Water quality and contaminants in stream surface waters collected in the Delmarva Peninsula, 2022 (ver. 1.1, June 2026)
Per- and polyfluoroalkyl substances (PFAS) concentration results in the Wanaque, Ramapo, Pompton, and Passaic River watersheds, New Jersey 2025 Per- and polyfluoroalkyl substances (PFAS) concentration results in the Wanaque, Ramapo, Pompton, and Passaic River watersheds, New Jersey 2025
Concentration results for inorganic constituents in discrete tapwater samples, Montana, 2024. Concentration results for inorganic constituents in discrete tapwater samples, Montana, 2024.
Target chemical concentrations of mixed-organic compounds and microbiological indicators in tapwater, Montana, 2024 Target chemical concentrations of mixed-organic compounds and microbiological indicators in tapwater, Montana, 2024
Concentration results for per- and polyfluoroalkyl substances (PFAS) analyzed in fish tissue, bed sediment, and biofilm samples, Montana, 2023 Concentration results for per- and polyfluoroalkyl substances (PFAS) analyzed in fish tissue, bed sediment, and biofilm samples, Montana, 2023
Water quality and contaminants in stream surface waters collected in Southeast Pennsylvania and Maryland Piedmont mixed agriculture, 2023 (ver. 1.1, June 2026) Water quality and contaminants in stream surface waters collected in Southeast Pennsylvania and Maryland Piedmont mixed agriculture, 2023 (ver. 1.1, June 2026)
Contaminants in bed sediment from surface waters collected in the Chesapeake Bay Watershed, 2021-24 (ver. 1.1, June 2026). Contaminants in bed sediment from surface waters collected in the Chesapeake Bay Watershed, 2021-24 (ver. 1.1, June 2026).
Per- and polyfluoroalkyl substances (PFAS) results in tapwater samples, in select areas within the United States, beginning 2023 (ver. 2.0, June 2025) Per- and polyfluoroalkyl substances (PFAS) results in tapwater samples, in select areas within the United States, beginning 2023 (ver. 2.0, June 2025)
Nutrient and trace element results for the U.S. Geological Survey vernal ponds study, Pleasant Grove, New Jersey, 2022-23 Nutrient and trace element results for the U.S. Geological Survey vernal ponds study, Pleasant Grove, New Jersey, 2022-23
Quarterly sample results for per- and polyfluoroalkyl substances (PFAS) for locations in Campbell, Wisconsin, 2021-24 (ver. 2.0, March 2025) Quarterly sample results for per- and polyfluoroalkyl substances (PFAS) for locations in Campbell, Wisconsin, 2021-24 (ver. 2.0, March 2025)
Organic and inorganic constituents in surface water and native and non-native fish and frog health data collected from streams, impoundments and wetlands in the New Jersey Pinelands, 2017-2020 (ver. 1.1, August 2022) Organic and inorganic constituents in surface water and native and non-native fish and frog health data collected from streams, impoundments and wetlands in the New Jersey Pinelands, 2017-2020 (ver. 1.1, August 2022)
USGS Technician Jonathan Cohl servicing an in-situ continuous water quality multi-parameter sonde (YSI 6920 V2-2) at 01408000 Manasquan River at Squankum, New Jersey to calculate fouling and drift to apply corrections to multiple time series for real-time data.
USGS Technician Jonathan Cohl servicing an in-situ continuous water quality multi-parameter sonde (YSI 6920 V2-2) at 01408000 Manasquan River at Squankum, New Jersey to calculate fouling and drift to apply corrections to multiple time series for real-time data.