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Federal
Sucralose Concentrations in Groundwater in California's Sacramento Valley Shallow Aquifer System
Department of the Interior —
This data release comprises a set of environmental sucralose occurrence data in the Sacramento area. Groundwater samples were collected throughout the Sacramento... -
Federal
California Groundwater Ambient Monitoring and Assessment (GAMA) Program Shallow Aquifer Assessment Study Unit Boundaries for Assessment of Groundwater Resources
Department of the Interior —
The California Groundwater Ambient Monitoring and Assessment Program (GAMA) is a statewide assessment of groundwater quality designed to help better understand and... -
Federal
Groundwater-Quality Data in the Mojave Basin Shallow Aquifer Study Unit, 2018
Department of the Interior —
The U.S. Geological Survey collected groundwater samples from 49 wells used for domestic and small system drinking water supplies and 10 monitoring wells in San... -
Federal
WRTDS-K nutrient and sediment loads at Illinois EPA Ambient Water Quality Monitoring Network sites through water year 2020
Department of the Interior —
This data release contains estimates of annual nitrate, suspended sediment, phosphorus, and chloride loads and uncertainty from sites in the Illinois Environmental... -
Federal
Groundwater-quality data in the Mokelumne, Cosumnes, and American River Watersheds Shallow Aquifer Study Unit, 2016-2017: Results from the California GAMA Priority Basin Project
Department of the Interior —
The U.S. Geological Survey collected groundwater samples from 67 wells and 1 spring used for domestic and small system drinking water supplies in Placer, El Dorado,... -
Federal
Study area boundaries of the Tulare Shallow Aquifer Study Unit
Department of the Interior —
The U.S. Geological Survey collected groundwater samples from 95 domestic wells in Tulare and Kings Counties, California in 2014-2015. The wells were sampled for the... -
Federal
Data for assessing groundwater age and recharge rates using environmental tracers for groundwater basins in the Gilroy-Hollister area and northern San Joaquin Valley, California
Department of the Interior —
This dataset provides groundwater age estimates for 203 wells used as public- and domestic-supply in two selected areas of California. Groundwater ages were estimated... -
Federal
NARSTO EPA Supersite (SS) Pittsburgh Particulate Matter (PM) Composition Data
National Aeronautics and Space Administration —
NARSTO_EPA_SS_PITTSBURGH_PM_COMPOSITION_DATA is the North American Research Strategy for Tropospheric Ozone (NARSTO) Environmental Protection Agency (EPA) Supersite... -
Federal
Compilation of lithologic data from public supply well completion reports submitted to the California Department of Water Resources (ver. 3.0 July 2025)
Department of the Interior —
This data release was prepared as part of an agreement between the California Department of Water Resources (DWR) and the United States Geological Survey (USGS) to... -
Federal
Groundwater-quality data in the Mokelumne, Cosumnes, and American River Watersheds Shallow Aquifer Study Unit, 2016-2017: Tables
Department of the Interior —
The U.S. Geological Survey collected groundwater samples from 67 wells and 1 spring used for domestic and small system drinking water supplies in Placer, El Dorado,... -
Federal
Groundwater-quality data in the Redding-Red Bluff Shallow Aquifer Study Unit, 2018-2019: Results from the California GAMA Priority Basin Project
Department of the Interior —
The U.S. Geological Survey collected groundwater samples from 50 wells used for domestic and small system drinking water supplies in Shasta and Tehama Counties,... -
Federal
Groundwater-Quality Data in the Mojave Basin Shallow Aquifer Study Unit, 2018: Results from the California GAMA Priority Basin Project
Department of the Interior —
The U.S. Geological Survey collected groundwater samples from 49 wells used for domestic and small system drinking water supplies and 10 monitoring wells in San... -
Federal
Groundwater-quality data in the Modesto-Turlock-Merced Domestic-Supply Aquifer Study Unit, 2020-2021: Results from the California GAMA Priority Basin Project
Department of the Interior —
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... -
Federal
Potential Explanatory Factors for Groundwater Quality in the Sacramento Metropolitan Domestic-Supply Aquifer Study Unit, 2017: California GAMA Priority Basin Project
Department of the Interior —
This data release codifies and attributes explanatory factors that could potentially impact groundwater quality at 49 groundwater sites used for domestic water supply... -
Federal
Groundwater-quality data in the Sacramento Metro shallow aquifer study unit, 2017: Results from the California GAMA Priority Basin Project
Department of the Interior —
The U.S. Geological Survey collected groundwater samples from 49 wells used for domestic and small system drinking water supplies in Amador, Placer, Sutter, and... -
Federal
Water use information for sites sampled by the California Groundwater Ambient Monitoring and Assessment Program Priority Basin Project (GAMA-PBP), 2004-2021 (ver. 4.0, April 2025)
Department of the Interior —
The U.S. Geological Survey collected water-quality samples from 3,359 sites between May 2004 and November 2024 for the California Groundwater Ambient Monitoring and... -
Federal
California Groundwater Ambient Monitoring and Assessment (GAMA) Program Domestic-Supply (Shallow) Aquifer Assessment Study Unit Grid Cells for Assessment of Groundwater Resources
Department of the Interior —
The California Groundwater Ambient Monitoring and Assessment Program (GAMA) is a statewide assessment of groundwater quality designed to help better understand and... -
Federal
Groundwater-quality data in the Butte-Sutter-Yuba Domestic-Supply Aquifer Study Unit, 2021: Results from the California GAMA Priority Basin Project
Department of the Interior —
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... -
Federal
Groundwater-quality data in the Coachella Valley Domestic Supply Aquifer Study Unit, 2020: Results from the California GAMA Priority Basin Project (ver. 2.0, April 2022)
Department of the Interior —
The U.S. Geological Survey collected groundwater samples from 38 wells used for domestic and small system drinking water supply in the Coachella Valley of California... -
Federal
Cell boundaries of the Tulare Shallow Aquifer Study Unit
Department of the Interior —
The U.S. Geological Survey collected groundwater samples from 95 domestic wells in Tulare and Kings Counties, California in 2014-2015. The wells were sampled for the...