perfluoroheptanoic acid is a chemical contaminant that is a potential threat to human health.
| Commonwealth Utilities Corp. (Saipan) | 0.41 µg/L (on 2/22/2015) | MP |
|---|---|---|
| Doylestown Twp. Muni. Authority | 0.08691 µg/L (on 2/18/2014) | PA |
| Suffolk County Water Authority | 0.0820 µg/L (on 11/26/2013) | NY |
| Artesian Water Company | 0.08 µg/L (on 1/28/2014) | DE |
| POTRERO ELEMENTARY SCHOOL | 0.0727 µg/L (on 5/15/2024) | CA |
| Warminster Municipal Authority | 0.0710 µg/L (on 6/9/2014) | PA |
| Security WSD | 0.07 µg/L (on 1/15/2014) | CO |
| Emerald Coast Utilities Authority | 0.0690 µg/L (on 11/11/2014) | FL |
| City of Dunn | 0.06 µg/L (on 9/22/2015) | NC |
| Hyannis Water System | 0.0580 µg/L (on 5/22/2014) | MA |
| Oakdale | 0.0528 µg/L (on 7/14/2015) | MN |
| Town of Fuquay-Varina | 0.05 µg/L (on 9/23/2014) | NC |
| United Water Delaware | 0.0488 µg/L (on 11/6/2014) | DE |
| Brunswick County Water System | 0.0470 µg/L (on 9/10/2015) | NC |
| YESHIVA FARM SETTLEMENT | 0.0455 µg/L (on 10/24/2023) | NY |
| TELFORD BOROUGH AUTHORITY | 0.0435 µg/L (on 3/18/2025) | PA |
| Brunswick Regional Water & Sewer H2GO | 0.040960 µg/L (on 10/21/2014) | NC |
| Rome | 0.04 µg/L (on 11/11/2015) | GA |
| Harnett County Department of Public Utilities | 0.04 µg/L (on 9/17/2014) | NC |
| Horsham Water & Sewer Authority | 0.0390 µg/L (on 6/24/2014) | PA |
| Warrington Township Water & Sewer Department | 0.0336 µg/L (on 11/11/2014) | PA |
| CITY OF FRESNO | 0.031 µg/L (on 3/20/2023) | CA |
| EMMAUS BOROUGH PUBLIC WATER | 0.0309 µg/L (on 8/1/2024) | PA |
| Gadsden Waterworks & Sewer Board | 0.03 µg/L (on 10/2/2014) | AL |
| West Morgan - East Lawrence Water Authority | 0.03 µg/L (on 2/5/2014) | AL |
| Liberty Water LPSCO | 0.03 µg/L (on 5/29/2014) | AZ |
| Fort Drum | 0.03 µg/L (on 9/8/2014) | NY |
| City of Sanford | 0.0290 µg/L (on 12/19/2013) | NC |
| CFPUA - Wilmington | 0.0270 µg/L (on 9/8/2014) | NC |
| Issaquah Water System | 0.0258 µg/L (on 7/22/2013) | WA |
| Moore County Public Utilities - Pinehurst | 0.0250 µg/L (on 11/26/2013) | NC |
| Widefield WSD | 0.0240 µg/L (on 5/14/2014) | CO |
| City of Miami Beach | 0.0240 µg/L (on 10/10/2014) | FL |
| United Water PA | 0.0234 µg/L (on 2/4/2014) | PA |
| CAERNARVON TWP AUTH | 0.0231 µg/L (on 4/14/2025) | PA |
| Eastern Municipal Water District | 0.0220 µg/L (on 6/18/2013) | CA |
| MDWASA - Main System | 0.0220 µg/L (on 1/13/2015) | FL |
| SUEZ WATER PA BETHEL | 0.0219 µg/L (on 1/21/2025) | PA |
| City of Newburgh | 0.0210 µg/L (on 12/30/2013) | NY |
| NORTH BAY VILLAGE, CITY OF | 0.0208 µg/L (on 12/6/2023) | FL |
| Waterworks Board of Prattville | 0.02 µg/L (on 12/16/2014) | AL |
| VAW Water System, Inc. | 0.02 µg/L (on 2/18/2014) | AL |
| Rainbow City Utilities Board | 0.02 µg/L (on 10/21/2013) | AL |
| Southside Waterworks | 0.02 µg/L (on 10/21/2013) | AL |
| Albertville Utilities Board | 0.02 µg/L (on 10/13/2014) | AL |
| Northeast Alabama Water System | 0.02 µg/L (on 2/27/2015) | AL |
| City of Fountain | 0.02 µg/L (on 1/15/2013) | CO |
| Summerville | 0.02 µg/L (on 11/18/2015) | GA |
| Town of Holly Springs | 0.02 µg/L (on 10/23/2013) | NC |
| New Windsor Consolidated Water District | 0.0190 µg/L (on 10/21/2014) | NY |