PFAS ("forever chemicals")
Perfluorononanoic acid in U.S. tap water
68 public water systems across 19 U.S. states report Perfluorononanoic acid in their annual Consumer Confidence Report. 1 sit at or above the federal limit.
What it is
Perfluorononanoic acid, a PFAS 'forever chemical.'
Why it's regulated
Regulated by the EPA at 10 parts per trillion and included in the PFAS Hazard Index.
At or above the federal limit (1)
| Water system | Measured | vs. limit |
|---|---|---|
| Pomona, CA 2024 annual report | 5 ng/L | 1.3× the limit |
Within the federal limit (56)
| Water system | Measured |
|---|---|
| City of Hialeah, FL 2023 annual report | 0–5 ng/L |
| City of Homestead, FL 2023 annual report | 0–5 ng/L |
| City of North Miami Beach, FL 2023 annual report | 0–5 ng/L |
| Miami Dade, FL 2023 annual report | 0–5 ng/L |
| Goodyear, AZ 2024 annual report | 4 ng/L |
| Boonsboro Keedysville, MD 2024 annual report | 375–1 |
| Newark, NJ 2024 annual report | 0.69 ng/L |
| Rockville, MD 2024 annual report | 0.27 |
| Green Bay, WI 2024 annual report | 0–0.57 ng/L |
| Albuquerque, NM 2024 annual report | Not detected |
| Anchorage, AK 2024 annual report | Not detected ng/L |
| 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 |
| City of Baltimore, MD 2024 annual report | Not detected |
| Dallas, TX 2024 annual report | Not detected ng/L |
| Dearborn, MI 2024 annual report | Not detected ug/L |
| El Cajon, CA 2024 annual report | Not detected ng/L |
| Franklin, WI 2024 annual report | Not detected ug/L |
| Glendale, AZ 2024 annual report | Not detected ng/L |
| Grand Rapids, MI 2025 annual report | Not detected ng/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 |
| Jersey City, NJ 2024 annual report | Not detected ng/L |
| Louisville, KY 2024 annual report | 0 |
| Lubbock, TX 2024 annual report | Not detected ng/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 |
| Mobile, AL 2024 annual report | Not detected |
| New Berlin, WI 2024 annual report | Not detected ug/L |
| Oxnard, CA 2024 annual report | Not detected |
| Pasadena, CA 2023 annual report | Not detected ug/L |
| Raleigh, NC 2024 annual report | Not detected |
| 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 |
| Suffolk, VA 2024 annual report | Not detected ng/L |
| Tempe, AZ 2024 annual report | Not detected ng/L |
| Thiensville, WI 2024 annual report | Not detected ug/L |
| Town of Garner, NC 2024 annual report | Not detected |
| Town of Knightdale, NC 2024 annual report | Not detected |
| Town of Rolesville, NC 2024 annual report | Not detected |
| Town of Wake Forest, NC 2024 annual report | Not detected |
| Town of Wendell, NC 2024 annual report | Not detected |
| Town of Zebulon, NC 2024 annual report | Not detected |
| Tracy, CA 2024 annual report | Not detected |
Showing 50 of 56. The full list is in the JSON API.
Frequently asked
+What is Perfluorononanoic acid?
Perfluorononanoic acid, a PFAS 'forever chemical.' Regulated by the EPA at 10 parts per trillion and included in the PFAS Hazard Index.
+What is the federal limit for Perfluorononanoic acid in drinking water?
The federal MCL for Perfluorononanoic acid 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 Perfluorononanoic acid over the federal limit?
1 of the 68 public water systems on The Water Map report Perfluorononanoic acid at or above its federal limit, spanning 19 U.S. states. The full list is on this page.
+How can I check if Perfluorononanoic acid 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 Perfluorononanoic acid.