PFAS ("forever chemicals") · 2025
PFOS in Lees Summit, MO tap water
Lees Summit, MO's 2025 PFOS measurement is below the federal limit of 4 ng/L (MCL).
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Maximum Sampled Result | 0.86 ng/L | 4 ng/L MCL |
Range System-wide | 0–0.86 ng/L | 4 ng/L MCL |
Reported level Water System Name | 2 ng/L | 4 ng/L MCL |
Verbatim from Lees Summit, MO's 2025 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.
People also ask
+Is there PFOS in Lees Summit, MO tap water?
Yes — Lees Summit, MO's 2025 Consumer Confidence Report lists PFOS at 2 ng/L. Lees Summit, MO's 2025 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.
+Where does this PFOS measurement come from?
This page reproduces the PFOS entry from the 2025 Consumer Confidence Report published by the Lees Summit, MO 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/mo/lees-summit/2025/source.