perfluorohexanesulfonic acid is a chemical contaminant that is a potential threat to human health.
| Commonwealth Utilities Corp. (Saipan) | 1.60 µg/L (on 2/22/2015) | MP |
|---|---|---|
| Oatman Water Company | 0.73 µg/L (on 4/22/2014) | AZ |
| Artesian Water Company | 0.68 µg/L (on 1/28/2014) | DE |
| Security WSD | 0.59 µg/L (on 7/31/2014) | CO |
| Horsham Water & Sewer Authority | 0.59 µg/L (on 6/24/2014) | PA |
| City of Tucson | 0.42 µg/L (on 4/16/2013) | AZ |
| Warminster Municipal Authority | 0.3890 µg/L (on 6/9/2014) | PA |
| Widefield WSD | 0.33 µg/L (on 5/19/2014) | CO |
| Hyannis Water System | 0.27 µg/L (on 5/22/2014) | MA |
| POTRERO ELEMENTARY SCHOOL | 0.2502 µg/L (on 5/15/2024) | CA |
| Warrington Township Water & Sewer Department | 0.243810 µg/L (on 11/11/2014) | PA |
| Issaquah Water System | 0.2410 µg/L (on 7/22/2013) | WA |
| United Water PA | 0.2090 µg/L (on 2/4/2014) | PA |
| City of Fountain | 0.19 µg/L (on 4/16/2013) | CO |
| Bemidji | 0.1870 µg/L (on 11/12/2014) | MN |
| Emerald Coast Utilities Authority | 0.18 µg/L (on 11/11/2014) | FL |
| Westfield Water Department | 0.17 µg/L (on 2/27/2013) | MA |
| City of Zephyrhills | 0.16 µg/L (on 4/4/2014) | FL |
| BAYLEAF MASTER | 0.1526 µg/L (on 12/9/2024) | NC |
| Wright-Patterson AFB Area A/C | 0.15 µg/L (on 4/8/2015) | OH |
| GU Waterworks Authority - Northern System | 0.14 µg/L (on 9/27/2015) | GU |
| Suffolk County Water Authority | 0.14 µg/L (on 12/29/2014) | NY |
| Eastern Municipal Water District | 0.12 µg/L (on 10/8/2013) | CA |
| Rhinelander Water & Wastewater | 0.1173 µg/L (on 1/17/2013) | WI |
| Liberty Water LPSCO | 0.11 µg/L (on 5/29/2014) | AZ |
| Sanford Water District | 0.11 µg/L (on 4/9/2013) | ME |
| City of Tempe | 0.0950 µg/L (on 7/16/2013) | AZ |
| Atlantic City MUA | 0.0940 µg/L (on 2/25/2015) | NJ |
| CA Water Service - Visalia | 0.0920 µg/L (on 6/11/2014) | CA |
| CA American Water Co. - Suburban | 0.0850 µg/L (on 4/7/2015) | CA |
| NEW MARTINSVILLE | 0.0841 µg/L (on 5/16/2023) | WV |
| Fort Drum | 0.08 µg/L (on 3/4/2015) | NY |
| City of Stuart Water Plant | 0.0790 µg/L (on 7/7/2014) | FL |
| SAUKVILLE WATERWORKS | 0.073 µg/L (on 2/25/2025) | WI |
| City of Martinsburg | 0.0709 µg/L (on 11/12/2014) | WV |
| City of Newburgh | 0.07 µg/L (on 12/30/2013) | NY |
| PEWAUKEE CITY WATER AND SEWER UTILITY | 0.069 µg/L (on 12/18/2024) | WI |
| Dyer Water Department | 0.0654 µg/L (on 8/13/2014) | IN |
| Vienna | 0.0641 µg/L (on 5/27/2015) | WV |
| Bethany | 0.0630 µg/L (on 5/11/2015) | OK |
| Camp Pendleton (South) | 0.0620 µg/L (on 5/21/2014) | CA |
| GREAT BEND, CITY OF | 0.060 µg/L (on 10/11/2023) | KS |
| NJ American Water Co. - Raritan | 0.06 µg/L (on 3/13/2015) | NJ |
| CITY OF ATWATER | 0.059 µg/L (on 5/7/2024) | CA |
| Woodbury | 0.0577 µg/L (on 4/15/2015) | MN |
| ARTONDALE WATER SYSTEM | 0.0558 µg/L (on 4/17/2023) | WA |
| MOSES LAKE CITY OF | 0.0541 µg/L (on 8/23/2023) | WA |
| New Windsor Consolidated Water District | 0.0536 µg/L (on 12/5/2014) | NY |
| City of Ocala | 0.0530 µg/L (on 4/6/2015) | FL |
| Pierre | 0.0530 µg/L (on 7/16/2014) | SD |