PFAS in District of Columbia drinking water
EPA's final UCMR 5 data covers 3 public water systems in District of Columbia, serving about 668,435 people. PFAS turned up in 3 of them (100%). 0 averaged above at least one EPA limit at a sampling point.
Every tested system in District of Columbia
Largest first. PFOA and PFOS columns show the average at each system's worst sampling point; EPA's limit for each is 4 ppt. Filter by name:
| Water system | People | PFOA | PFOS | PFAS found | Result |
|---|---|---|---|---|---|
| D.c. Water and Sewer Authority · Washington | 632,323 | - | - | 2 | Below limits |
| Joint Base Anacostia - Bolling · Washington | 19,312 | - | - | 2 | Below limits |
| Naval Station Washington - Wny · Washington Navy Yard | 16,800 | - | - | 2 | Below limits |
On a private well in District of Columbia?
EPA's program only covers public systems. Private wells are never part of UCMR 5, so the only way to know is to test. Our well testing guide covers which lab tests to order, and the best well water systems covers what to install once you have results.
Cite this page
Well & Tap. "PFAS in District of Columbia drinking water: results for 3 systems." Data: U.S. EPA UCMR 5, final release August 2026. https://wellandtap.com/pfas/district-of-columbia/
Source: EPA UCMR 5 final occurrence data (August 2026); population from EPA SDWIS. Method.