Metals · 2025
Thallium in City of Fairfield, CA tap water
City of Fairfield, CA's 2025 Consumer Confidence Report tested for Thallium and reported no detectable amount.
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Highest single sample Source water | Not detected UG/L | 2 UG/L MCL |
Highest single sample Entry point | Not detected UG/L | 2 UG/L MCL |
Verbatim from City of Fairfield, CA's 2025 Consumer Confidence Report — source document ↗
How City of Fairfield, CA compares
1 of the 188 systems measuring Thallium on The Water Map have it at or above the federal limit:
Nearby systems also reporting Thallium:
People also ask
+Is there Thallium in City of Fairfield, CA tap water?
City of Fairfield, CA's 2025 Consumer Confidence Report tested for Thallium and found no detectable amount.
+What's the federal limit for Thallium in drinking water?
The federal MCL for Thallium is 2 UG/L. The EPA enforces this against the regulated reporting statistic (running annual average or 90th percentile), not a single-sample spike.
+Which other U.S. cities have Thallium over the federal limit?
1 of the 188 systems on The Water Map measuring Thallium report it at or above the federal limit. Examples include St George, UT.
+Where does this Thallium measurement come from?
This page reproduces the Thallium entry from the 2025 Consumer Confidence Report published by the City of Fairfield, 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/fairfield/2025/source.