Disinfection byproducts · 2024
Chlorate in San Mateo, CA tap water
San Mateo, CA's 2024 report shows Chlorate detected, but the EPA has not set an enforceable federal limit for it.
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Range SFPUC Water | 24–597 ug/L | 800 ug/L NL |
Average SFPUC Water | 144 ug/L | 800 ug/L NL |
Verbatim from San Mateo, CA's 2024 Consumer Confidence Report — source document ↗
About Chlorate
A byproduct that can form during disinfection, especially when hypochlorite solutions degrade.
Has no enforceable federal limit but is on the EPA contaminant candidate list; high levels can affect the thyroid.
How San Mateo, CA compares
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People also ask
+Is there Chlorate in San Mateo, CA tap water?
Yes — San Mateo, CA's 2024 Consumer Confidence Report lists Chlorate at 144 ug/L. San Mateo, CA's 2024 report shows Chlorate detected, but the EPA has not set an enforceable federal limit for it.
+What's the federal limit for Chlorate in drinking water?
The federal NL for Chlorate is 800 ug/L. The EPA enforces this against the regulated reporting statistic (running annual average or 90th percentile), not a single-sample spike.
+What is Chlorate?
A byproduct that can form during disinfection, especially when hypochlorite solutions degrade. Has no enforceable federal limit but is on the EPA contaminant candidate list; high levels can affect the thyroid.
+Where does this Chlorate measurement come from?
This page reproduces the Chlorate entry from the 2024 Consumer Confidence Report published by the San Mateo, 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/san-mateo/2024/source.