California · system CA1910090 · serves 37,931 people
Band placed by this system's most recent reported result within a rolling three-year window; the three-year range below shows the full spread.
The reading
A single reading is not a complete account of what a household drinks, so the three-year range and the number of tests behind it are shown too — a reading backed by many tests over three years is a fuller picture than one from a single sample.
Source: California State Water Resources Control Board - Division of Drinking Water drinking-water records (bulk data feed; no per-record link) · California · system CA1910090 · the three years from August 9, 2023 to August 9, 2026
Where this ranks
This system's nitrate sits in the top 19% nationally. Systems reporting less serve about 81% of everyone on NitrateSmart's tracked supply; the other about 19% are on systems reporting the same or more. That compares what systems reported, not what comes out of any one tap.
What "Human impact likely" means
Nitrate here is low, but a little above natural background[1] — enough to suggest that fertilizer, manure, a septic system, or wastewater has reached the source. This is a statement about where the nitrate came from, not about harm.
Sources
The bands describe how strongly human activity, read from nitrate, has marked a water source — they are not a safety verdict. More on what the numbers mean and where nitrate comes from.
Nitrate in community water systems, from the utilities’ own compliance reporting.
Results reaching back to July 2023 · current through August 9, 2026.
Educational information, not medical or personal safety advice.