Drinking water / DC
PFAS in District of Columbia drinking water
3 District of Columbia public water systems tested under UCMR5. 3 detected at least one PFAS compound; 0 detected none at the reporting thresholds. Values are the highest single result per compound, in ng/L (parts per trillion). The federal limit for PFOA and PFOS is 4 ng/L.
| Water system | Serves | Highest results (ng/L) | Reading |
|---|---|---|---|
| D.C. WATER AND SEWER AUTHORITY DC0000002 | District of Columbia | PFPeA 4.7PFHxA 3.1 | detected |
| JOINT BASE ANACOSTIA - BOLLING DC0000004 | District of Columbia | PFPeA 5.6PFHxA 5.2 | detected |
| NAVAL STATION WASHINGTON - WNY DC0000003 | District of Columbia | PFPeA 4.3PFHxA 3.8 | detected |
* exceeds the final federal MCL for that compound. Detections of compounds whose limits EPA proposed to rescind in May 2026 are shown for information.
A detection at the system level does not tell you what reaches one specific tap: levels vary by entry point, treatment train and plumbing. A certified lab test of your own tap settles it. Testing and treatment options