PFAS ("forever chemicals") · 2024
PFOS in Poolesville, MD tap water
Poolesville, MD's 2024 PFOS measurement is below the federal limit of 4 ng/L (MCL).
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Average System-wide | 2.653 ng/L | 4 ng/L MCL |
Range of Level Detected | 0–6.5 ng/L | 4 ng/L MCL |
Verbatim from Poolesville, MD's 2024 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 Poolesville, MD compares
4 of the 11 MD 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 Poolesville, MD tap water?
Yes — Poolesville, MD's 2024 Consumer Confidence Report lists PFOS at 2.653 ng/L. Poolesville, MD's 2024 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?
4 of the 11 MD systems on The Water Map measuring PFOS report it at or above the federal limit. Examples include Boh Nak Mhp, MD, Backbone Mountain Boys Camp, MD, Cheltenham Youth Facility, MD.
+Where does this PFOS measurement come from?
This page reproduces the PFOS entry from the 2024 Consumer Confidence Report published by the Poolesville, MD 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/md/poolesville/2024/source.