PFAS ("forever chemicals") · 2023
PFOS in Alameda County Water District — Fremont, Ca, CA tap water
Alameda County Water District — Fremont, Ca, CA's 2023 PFOS measurement is below the federal limit of 4 ng/L (MCL).
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Average Desalinated Water | Not detected ng/L | 4 ng/L MCL |
Average Blended Water | Not detected ng/L | 4 ng/L MCL |
Range Blended Water | 0–20 ng/L | 4 ng/L MCL |
Range Purchased San Francisco Water | Not detected ng/L | 4 ng/L MCL |
Range Desalinated Water | Not detected ng/L | 4 ng/L MCL |
Average Treated Surface Water | Not detected ng/L | 4 ng/L MCL |
Range Treated Surface Water | Not detected ng/L | 4 ng/L MCL |
Average Purchased San Francisco Water | Not detected ng/L | 4 ng/L MCL |
Verbatim from Alameda County Water District — Fremont, Ca, CA's 2023 Consumer Confidence Report — source document ↗
About PFOS
Perfluorooctanesulfonic acid, a PFAS 'forever chemical' once used in firefighting foam and coatings.
Linked to cancer, thyroid disease, and immune effects; the EPA set an enforceable limit of 4 parts per trillion.
How Alameda County Water District — Fremont, Ca, CA compares
5 of the 328 systems measuring PFOS on The Water Map have it at or above the federal limit:
Nearby systems also reporting PFOS:
People also ask
+Is there PFOS in Alameda County Water District — Fremont, Ca, CA tap water?
Yes — Alameda County Water District — Fremont, Ca, CA's 2023 Consumer Confidence Report lists PFOS at Not detected ng/L. Alameda County Water District — Fremont, Ca, CA's 2023 PFOS measurement is below the federal limit of 4 ng/L (MCL).
+What's the federal limit for PFOS in drinking water?
The federal MCL for PFOS is 4 ng/L. The EPA enforces this against the regulated reporting statistic (running annual average or 90th percentile), not a single-sample spike.
+What is PFOS?
Perfluorooctanesulfonic acid, a PFAS 'forever chemical' once used in firefighting foam and coatings. Linked to cancer, thyroid disease, and immune effects; the EPA set an enforceable limit of 4 parts per trillion.
+Which other U.S. cities have PFOS over the federal limit?
5 of the 328 systems on The Water Map measuring PFOS report it at or above the federal limit. Examples include Greensboro, NC, Riverside Highland Water Company — Grand Terrace, Ca, CA, Abilene, TX.
+Where does this PFOS measurement come from?
This page reproduces the PFOS entry from the 2023 Consumer Confidence Report published by the Alameda County Water District — Fremont, Ca, 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/alameda-county-water-district-fremont-ca/2023/source.