Danielle Dupuy
Danielle is a geographer with the California Water Science Center specializing in geospatial analysis, web application development, and data visualization. She provides GIS support to various projects related to water quality research. Her work includes building interactive dashboards, automating geospatial workflows, and developing tools that make scientific data more accessible.
Education and Certifications
M.S. in Geographic Information Systems (GIS) from University of Maryland
B.S. in Environmental Science and Technology from University of Maryland
Science and Products
Predictions of groundwater PFAS occurrence at drinking water supply depths in the United States Predictions of groundwater PFAS occurrence at drinking water supply depths in the United States
Per- and polyfluoroalkyl substances (PFAS), known colloquially as “forever chemicals”, have been associated with adverse human health effects and have contaminated drinking water supplies across the United States owing to their long-term and widespread use. People in the United States may unknowingly be drinking water that contains PFAS because of a lack of systematic analysis...
Authors
Andrea K. Tokranov, Katherine Marie Ransom, Laura M. Bexfield, Bruce D. Lindsey, Elise Watson, Danielle Dupuy, Paul E. Stackelberg, Miranda S. Fram, Stefan Voss, James A. Kingsbury, Bryant C. Jurgens, Kelly L. Smalling, Paul M. Bradley
Predicting redox conditions in groundwater at a national scale using random forest classification Predicting redox conditions in groundwater at a national scale using random forest classification
Redox conditions in groundwater may markedly affect the fate and transport of nutrients, volatile organic compounds, and trace metals, with significant implications for human health. While many local assessments of redox conditions have been made, the spatial variability of redox reaction rates makes the determination of redox conditions at regional or national scales problematic. In...
Authors
Anthony J. Tesoriero, Susan Wherry, Danielle Dupuy, Tyler D. Johnson
Modeling the dynamic penetration depth of post-1950s water in unconfined aquifers using environmental tracers: Central Valley, California Modeling the dynamic penetration depth of post-1950s water in unconfined aquifers using environmental tracers: Central Valley, California
The penetration depth of post-1950s recharge (D-1950) in aquifers is a marker that is frequently used to identify groundwater that is susceptible to anthropogenic contamination. Here, we compute D-1950 values at wells, interpolate them in space, and project them across time to map the moving front of modern recharge in four dimensions in the Central Valley aquifer system, California, USA...
Authors
Kirsten E. Faulkner, Bryant C. Jurgens, Stefan Voss, Danielle Dupuy, Zeno F. Levy
Data for evaluating sustainable management of groundwater-quality and trends for groundwater basins in the Gilroy-Hollister Valley and northern San Joaquin Valley, California Data for evaluating sustainable management of groundwater-quality and trends for groundwater basins in the Gilroy-Hollister Valley and northern San Joaquin Valley, California
This data release documents five tables and one geographic information systems shapefile feature used to evaluate groundwater quality and concentration trends for groundwater basins in the Gilroy-Hollister Valley and northern San Joaquin Valley, California. This dataset provides a framework for evaluating groundwater quality data at the spatial scale of groundwater basins and the...
Potential Explanatory Variables for Groundwater Quality in California Potential Explanatory Variables for Groundwater Quality in California
This data release codifies and attributes values for potential explanatory factors to groundwater well locations and to groundwater basins in California. The groundwater sites are 282,000 wells that have water-quality data and are listed in the California State Water Resources Control Boards' Groundwater Ambient Monitoring and Assessment Program Groundwater Information System (GAMA GIS)...
Groundwater-quality data in the Western Slope of the Sierra Nevada Domestic-Supply Aquifer Study Unit, 2024: Results from the California GAMA Priority Basin Project (ver. 1.2, March 2026) Groundwater-quality data in the Western Slope of the Sierra Nevada Domestic-Supply Aquifer Study Unit, 2024: Results from the California GAMA Priority Basin Project (ver. 1.2, March 2026)
The U.S. Geological Survey collected groundwater samples from 38 wells used for domestic and small system drinking water supplies in the south-central Sierra Nevada region, California in 2023 and 2024. The wells were sampled for the Western Slope of the Sierra Nevada domestic-supply aquifer study unit of the California Groundwater Ambient Monitoring and Assessment Program Priority Basin...
Groundwater-quality data in the Western Central Valley Domestic-Supply Aquifer Study Unit, 2023: Results from the California GAMA Priority Basin Project Groundwater-quality data in the Western Central Valley Domestic-Supply Aquifer Study Unit, 2023: Results from the California GAMA Priority Basin Project
The U.S. Geological Survey collected groundwater samples from 44 wells used for domestic and small system drinking water supplies in the western Central Valley, California in 2023. The wells were sampled for the Western Central Valley domestic-supply aquifer study unit of the State Water Resources Control Board Groundwater Ambient Monitoring and Assessment (GAMA) Program Priority Basin...
Predictions of PFAS in groundwater used as a source of drinking water and related data in the conterminous United States Predictions of PFAS in groundwater used as a source of drinking water and related data in the conterminous United States
An extreme gradient boosting ensemble tree model predicting per- and polyfluoroalkyl substances (PFAS) occurrence in groundwater at the depths typical of the bottom of public and domestic drinking water supplies across the conterminous United States was developed. PFAS data used to train the model were collected between 2019 and 2022 by the U.S. Geological Survey National Water Quality...
Input and results from a random forest classification (RFC) model that predicts redox conditions in groundwater in the contiguous United States Input and results from a random forest classification (RFC) model that predicts redox conditions in groundwater in the contiguous United States
This data release provides model inputs and outputs for a model that predicts redox conditions in groundwater in the contiguous United States. Input variables describe the hydrology, soils, geology, and hydrologic position of groundwater sample locations. The data release accompanies a journal article that describes model development and applications (Tesoriero_and_others_2023).
Groundwater-quality data in the Gilroy Hollister basin and surrounding areas Domestic-Supply Aquifer Study Unit, 2022: Results from the California GAMA Priority Basin Project Groundwater-quality data in the Gilroy Hollister basin and surrounding areas Domestic-Supply Aquifer Study Unit, 2022: Results from the California GAMA Priority Basin Project
The U.S. Geological Survey collected groundwater samples from 33 wells used for domestic and small system drinking water supplies in Santa Clara and San Benito Counties, California in 2022. The wells were sampled for the Gilroy Hollister basin and surrounding areas Domestic-Supply Aquifer Study Unit of the State Water Resources Control Board Groundwater Ambient Monitoring and Assessment...
Groundwater-quality data in the Kern County Domestic-Supply Aquifer Study Unit, 2022: Results from the California GAMA Priority Basin Project Groundwater-quality data in the Kern County Domestic-Supply Aquifer Study Unit, 2022: Results from the California GAMA Priority Basin Project
The U.S. Geological Survey collected groundwater samples from 33 wells used for domestic and small system drinking water supplies in Kern County, California in 2022. The wells were sampled for the Kern County Domestic-Supply Aquifer Study Unit of the State Water Resources Control Board Groundwater Ambient Monitoring and Assessment (GAMA) Program Priority Basin Project’s assessment of the...
Groundwater-quality data in the Butte-Sutter-Yuba Domestic-Supply Aquifer Study Unit, 2021: Results from the California GAMA Priority Basin Project Groundwater-quality data in the Butte-Sutter-Yuba Domestic-Supply Aquifer Study Unit, 2021: Results from the California GAMA Priority Basin Project
The U.S. Geological Survey collected groundwater samples from 38 wells used for domestic and small system drinking water supplies in Butte, Sutter, and Yuba counties of California during 2021. The wells were sampled for the Butte-Sutter-Yuba Domestic-Supply Aquifer Study Unit of the State Water Resources Control Board Groundwater Ambient Monitoring and Assessment (GAMA) Program Priority...
Groundwater-quality data in the Modesto-Turlock-Merced Domestic-Supply Aquifer Study Unit, 2020-2021: Results from the California GAMA Priority Basin Project Groundwater-quality data in the Modesto-Turlock-Merced Domestic-Supply Aquifer Study Unit, 2020-2021: Results from the California GAMA Priority Basin Project
The U.S. Geological Survey collected groundwater samples from 71 wells used for domestic and small system drinking water supplies in Stanislaus and Merced counties of California during 2020-2021. The wells were sampled for the Modesto-Turlock-Merced Domestic-Supply Aquifer Study Unit of the State Water Resources Control Board Groundwater Ambient Monitoring and Assessment (GAMA) Program...
Central Valley Aquifer Dating Central Valley Aquifer Dating
Central Valley Aquifer Age Dating | USGS California Water Science Center
Indigenous communities and migratory pathways Indigenous communities and migratory pathways
In both Native Hawaiian and Alaska Native traditions, birds play important roles in tracking seasons, signaling weather changes, guiding navigation, and locating food resources. Their movements and behaviors are read as part of an ongoing dialogue with the natural world.
Public-Supply Well Water Quality Results: Inorganic Data and Trends, 1974 - 2014 (California GAMA-PBP) Public-Supply Well Water Quality Results: Inorganic Data and Trends, 1974 - 2014 (California GAMA-PBP)
The GAMA-PBP Public-Supply Well Results data viewer allows the user to visualize and download California water-quality data and trends for1974 - 2014. Groundwater-quality data for 38 inorganic constituents are captured and can be downloaded for individual sites or by grid cell.
Science and Products
Predictions of groundwater PFAS occurrence at drinking water supply depths in the United States Predictions of groundwater PFAS occurrence at drinking water supply depths in the United States
Per- and polyfluoroalkyl substances (PFAS), known colloquially as “forever chemicals”, have been associated with adverse human health effects and have contaminated drinking water supplies across the United States owing to their long-term and widespread use. People in the United States may unknowingly be drinking water that contains PFAS because of a lack of systematic analysis...
Authors
Andrea K. Tokranov, Katherine Marie Ransom, Laura M. Bexfield, Bruce D. Lindsey, Elise Watson, Danielle Dupuy, Paul E. Stackelberg, Miranda S. Fram, Stefan Voss, James A. Kingsbury, Bryant C. Jurgens, Kelly L. Smalling, Paul M. Bradley
Predicting redox conditions in groundwater at a national scale using random forest classification Predicting redox conditions in groundwater at a national scale using random forest classification
Redox conditions in groundwater may markedly affect the fate and transport of nutrients, volatile organic compounds, and trace metals, with significant implications for human health. While many local assessments of redox conditions have been made, the spatial variability of redox reaction rates makes the determination of redox conditions at regional or national scales problematic. In...
Authors
Anthony J. Tesoriero, Susan Wherry, Danielle Dupuy, Tyler D. Johnson
Modeling the dynamic penetration depth of post-1950s water in unconfined aquifers using environmental tracers: Central Valley, California Modeling the dynamic penetration depth of post-1950s water in unconfined aquifers using environmental tracers: Central Valley, California
The penetration depth of post-1950s recharge (D-1950) in aquifers is a marker that is frequently used to identify groundwater that is susceptible to anthropogenic contamination. Here, we compute D-1950 values at wells, interpolate them in space, and project them across time to map the moving front of modern recharge in four dimensions in the Central Valley aquifer system, California, USA...
Authors
Kirsten E. Faulkner, Bryant C. Jurgens, Stefan Voss, Danielle Dupuy, Zeno F. Levy
Data for evaluating sustainable management of groundwater-quality and trends for groundwater basins in the Gilroy-Hollister Valley and northern San Joaquin Valley, California Data for evaluating sustainable management of groundwater-quality and trends for groundwater basins in the Gilroy-Hollister Valley and northern San Joaquin Valley, California
This data release documents five tables and one geographic information systems shapefile feature used to evaluate groundwater quality and concentration trends for groundwater basins in the Gilroy-Hollister Valley and northern San Joaquin Valley, California. This dataset provides a framework for evaluating groundwater quality data at the spatial scale of groundwater basins and the...
Potential Explanatory Variables for Groundwater Quality in California Potential Explanatory Variables for Groundwater Quality in California
This data release codifies and attributes values for potential explanatory factors to groundwater well locations and to groundwater basins in California. The groundwater sites are 282,000 wells that have water-quality data and are listed in the California State Water Resources Control Boards' Groundwater Ambient Monitoring and Assessment Program Groundwater Information System (GAMA GIS)...
Groundwater-quality data in the Western Slope of the Sierra Nevada Domestic-Supply Aquifer Study Unit, 2024: Results from the California GAMA Priority Basin Project (ver. 1.2, March 2026) Groundwater-quality data in the Western Slope of the Sierra Nevada Domestic-Supply Aquifer Study Unit, 2024: Results from the California GAMA Priority Basin Project (ver. 1.2, March 2026)
The U.S. Geological Survey collected groundwater samples from 38 wells used for domestic and small system drinking water supplies in the south-central Sierra Nevada region, California in 2023 and 2024. The wells were sampled for the Western Slope of the Sierra Nevada domestic-supply aquifer study unit of the California Groundwater Ambient Monitoring and Assessment Program Priority Basin...
Groundwater-quality data in the Western Central Valley Domestic-Supply Aquifer Study Unit, 2023: Results from the California GAMA Priority Basin Project Groundwater-quality data in the Western Central Valley Domestic-Supply Aquifer Study Unit, 2023: Results from the California GAMA Priority Basin Project
The U.S. Geological Survey collected groundwater samples from 44 wells used for domestic and small system drinking water supplies in the western Central Valley, California in 2023. The wells were sampled for the Western Central Valley domestic-supply aquifer study unit of the State Water Resources Control Board Groundwater Ambient Monitoring and Assessment (GAMA) Program Priority Basin...
Predictions of PFAS in groundwater used as a source of drinking water and related data in the conterminous United States Predictions of PFAS in groundwater used as a source of drinking water and related data in the conterminous United States
An extreme gradient boosting ensemble tree model predicting per- and polyfluoroalkyl substances (PFAS) occurrence in groundwater at the depths typical of the bottom of public and domestic drinking water supplies across the conterminous United States was developed. PFAS data used to train the model were collected between 2019 and 2022 by the U.S. Geological Survey National Water Quality...
Input and results from a random forest classification (RFC) model that predicts redox conditions in groundwater in the contiguous United States Input and results from a random forest classification (RFC) model that predicts redox conditions in groundwater in the contiguous United States
This data release provides model inputs and outputs for a model that predicts redox conditions in groundwater in the contiguous United States. Input variables describe the hydrology, soils, geology, and hydrologic position of groundwater sample locations. The data release accompanies a journal article that describes model development and applications (Tesoriero_and_others_2023).
Groundwater-quality data in the Gilroy Hollister basin and surrounding areas Domestic-Supply Aquifer Study Unit, 2022: Results from the California GAMA Priority Basin Project Groundwater-quality data in the Gilroy Hollister basin and surrounding areas Domestic-Supply Aquifer Study Unit, 2022: Results from the California GAMA Priority Basin Project
The U.S. Geological Survey collected groundwater samples from 33 wells used for domestic and small system drinking water supplies in Santa Clara and San Benito Counties, California in 2022. The wells were sampled for the Gilroy Hollister basin and surrounding areas Domestic-Supply Aquifer Study Unit of the State Water Resources Control Board Groundwater Ambient Monitoring and Assessment...
Groundwater-quality data in the Kern County Domestic-Supply Aquifer Study Unit, 2022: Results from the California GAMA Priority Basin Project Groundwater-quality data in the Kern County Domestic-Supply Aquifer Study Unit, 2022: Results from the California GAMA Priority Basin Project
The U.S. Geological Survey collected groundwater samples from 33 wells used for domestic and small system drinking water supplies in Kern County, California in 2022. The wells were sampled for the Kern County Domestic-Supply Aquifer Study Unit of the State Water Resources Control Board Groundwater Ambient Monitoring and Assessment (GAMA) Program Priority Basin Project’s assessment of the...
Groundwater-quality data in the Butte-Sutter-Yuba Domestic-Supply Aquifer Study Unit, 2021: Results from the California GAMA Priority Basin Project Groundwater-quality data in the Butte-Sutter-Yuba Domestic-Supply Aquifer Study Unit, 2021: Results from the California GAMA Priority Basin Project
The U.S. Geological Survey collected groundwater samples from 38 wells used for domestic and small system drinking water supplies in Butte, Sutter, and Yuba counties of California during 2021. The wells were sampled for the Butte-Sutter-Yuba Domestic-Supply Aquifer Study Unit of the State Water Resources Control Board Groundwater Ambient Monitoring and Assessment (GAMA) Program Priority...
Groundwater-quality data in the Modesto-Turlock-Merced Domestic-Supply Aquifer Study Unit, 2020-2021: Results from the California GAMA Priority Basin Project Groundwater-quality data in the Modesto-Turlock-Merced Domestic-Supply Aquifer Study Unit, 2020-2021: Results from the California GAMA Priority Basin Project
The U.S. Geological Survey collected groundwater samples from 71 wells used for domestic and small system drinking water supplies in Stanislaus and Merced counties of California during 2020-2021. The wells were sampled for the Modesto-Turlock-Merced Domestic-Supply Aquifer Study Unit of the State Water Resources Control Board Groundwater Ambient Monitoring and Assessment (GAMA) Program...
Central Valley Aquifer Dating Central Valley Aquifer Dating
Central Valley Aquifer Age Dating | USGS California Water Science Center
Indigenous communities and migratory pathways Indigenous communities and migratory pathways
In both Native Hawaiian and Alaska Native traditions, birds play important roles in tracking seasons, signaling weather changes, guiding navigation, and locating food resources. Their movements and behaviors are read as part of an ongoing dialogue with the natural world.
Public-Supply Well Water Quality Results: Inorganic Data and Trends, 1974 - 2014 (California GAMA-PBP) Public-Supply Well Water Quality Results: Inorganic Data and Trends, 1974 - 2014 (California GAMA-PBP)
The GAMA-PBP Public-Supply Well Results data viewer allows the user to visualize and download California water-quality data and trends for1974 - 2014. Groundwater-quality data for 38 inorganic constituents are captured and can be downloaded for individual sites or by grid cell.