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This report describes a survey of groundwater used by domestic and small drinking-water systems in California's Gilroy-Hollister basin and surrounding uplands. Its focus is the water present in the aquifer before filtration or treatment, rather than the water eventually delivered at a household tap.
Samples from thirty-three wells are examined within a grid-based assessment of the region. The study compares measured constituents with federal and California benchmarks and considers inorganic chemicals, dissolved solids, organic compounds, and microbiological indicators.
The publication explains how groundwater age and local hydrogeologic conditions help interpret the results. Readers will find maps, methods, and a systematic account of water-quality patterns across the study area. The complete report includes references and associated-data links, offering a geographically specific example of how a regional monitoring programme characterises groundwater resources used outside large public supply systems.
Kirsten E. Faulkner; Bryant C. Jurgens. Quality of Groundwater Used for Domestic Supply in the Gilroy-Hollister Basin and Surrounding Areas, California, 2022. U.S. Geological Survey, 2025. https://doi.org/10.3133/sir20255097. Public domain U.S. Government publication. Original agency, author and photograph credits retained.