Other · 2025
Diquat in Contra Costa Water District, CA tap water
Contra Costa Water District, CA's 2025 Consumer Confidence Report tested for Diquat and reported no detectable amount.
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Highest single sample Entry point | Not detected UG/L | 20 UG/L MCL |
Highest single sample Source water | Not detected UG/L | 20 UG/L MCL |
Verbatim from Contra Costa Water District, CA's 2025 Consumer Confidence Report — source document ↗
How Contra Costa Water District, CA compares
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People also ask
+Is there Diquat in Contra Costa Water District, CA tap water?
Contra Costa Water District, CA's 2025 Consumer Confidence Report tested for Diquat and found no detectable amount.
+What's the federal limit for Diquat in drinking water?
The federal MCL for Diquat is 20 UG/L. The EPA enforces this against the regulated reporting statistic (running annual average or 90th percentile), not a single-sample spike.
+Where does this Diquat measurement come from?
This page reproduces the Diquat entry from the 2025 Consumer Confidence Report published by the Contra Costa Water District, CA water utility — the annual drinking-water report every U.S. utility is required by federal law to publish. The original source document is archived at /water/ca/contra-costa-water-district/2025/source.