PFAS ("forever chemicals")
N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) in U.S. tap water
29 public water systems across 11 U.S. states report N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) in their annual Consumer Confidence Report. 1 sit at or above the federal limit.
What it is
N-methyl perfluorooctanesulfonamidoacetic acid, a PFAS-related compound.
Why it's regulated
Monitored under EPA rules as part of broad PFAS surveillance.
At or above the federal limit (1)
| Water system | Measured | vs. limit |
|---|---|---|
| Boonsboro Keedysville, MD 2024 annual report | 2355–9 | 1.5× the limit |
Within the federal limit (27)
| Water system | Measured |
|---|---|
| Albuquerque, NM 2024 annual report | Not detected |
| Brown Deer, WI 2024 annual report | Not detected ug/L |
| Butler, WI 2024 annual report | Not detected ug/L |
| Calvert Manor, MD 2024 annual report | Not detected |
| Chandler, AZ 2024 annual report | 0 ng/L |
| Dallas, TX 2024 annual report | Not detected ng/L |
| Dearborn, MI 2024 annual report | Not detected ug/L |
| Franklin, WI 2024 annual report | Not detected ug/L |
| Greendale, WI 2024 annual report | Not detected ug/L |
| Greenfield, WI 2024 annual report | Not detected ug/L |
| Hales Corners, WI 2024 annual report | Not detected ug/L |
| Menomonee Falls, WI 2024 annual report | Not detected ug/L |
| Mequon, WI 2024 annual report | Not detected ug/L |
| Milwaukee, WI 2024 annual report | Not detected ug/L |
| New Berlin, WI 2024 annual report | Not detected ug/L |
| Pasadena, CA 2023 annual report | Not detected ug/L |
| Salem, OR 2023 annual report | Not detected ug/L |
| Santa Clarita, CA 2024 annual report | Not detected ug/L |
| Shorewood, WI 2024 annual report | Not detected ug/L |
| St. Francis, WI 2024 annual report | Not detected ug/L |
| Thiensville, WI 2024 annual report | Not detected ug/L |
| Tracy, CA 2024 annual report | Not detected |
| Waukesha, WI 2024 annual report | Not detected ug/L |
| Wauwatosa, WI 2024 annual report | Not detected ug/L |
| West Allis, WI 2024 annual report | Not detected ug/L |
| West Valley City, UT 2024 annual report | Not detected ug/L |
| Wilmington, NC 2024 annual report | Not detected ng/L |
Frequently asked
+What is N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)?
N-methyl perfluorooctanesulfonamidoacetic acid, a PFAS-related compound. Monitored under EPA rules as part of broad PFAS surveillance.
+What is the federal limit for N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) in drinking water?
The federal MCL for N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) is 1.8 . The EPA enforces this against the regulated reporting statistic (typically a running annual average or 90th percentile), not a single-sample spike.
+How many U.S. water systems have N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) over the federal limit?
1 of the 29 public water systems on The Water Map report N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) at or above its federal limit, spanning 11 U.S. states. The full list is on this page.
+How can I check if N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) is in my city's tap water?
Search your city on The Water Map (https://www.thewatermap.com/) or browse the list on this page. Every U.S. public water utility is required to publish an annual Consumer Confidence Report that lists every contaminant it measured, including N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA).
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