District of Columbia tap water quality

10 community water systems serving 671,844 people.

Data: U.S. EPA · How we read the data · How we check it

systems with PFAS above a federal limit

people served by them

systems EPA tested for PFAS

systems above the lead action level

PFAS: EPA's 2023–2025 testing. Lead: results from the last five years. 1 more systems have no recent lead results in EPA's database.

Largest water systems in District of Columbia

D.C. Water and Sewer Authority
632,323 people · Purchased surface water · District of Columbia
No PFAS above limits
Joint Base Anacostia – Bolling Water System
20,411 people · Purchased surface water · District of Columbia
No PFAS above limitsAlso: 5 health-based violations since 2016
Naval Station Washington – Wny Water System
16,800 people · Purchased surface water · District of Columbia
Total trihalomethanes (TTHM) violationsAlso: Coliform bacteria violation
Wingate Elementary School (New) – BIE
800 people · Groundwater · District of Columbia
Not in EPA's PFAS sampleAlso: 2 health-based violations since 2016
Fort Wingate Community Water System
550 people · Groundwater · District of Columbia
Not in EPA's PFAS sampleAlso: 5 health-based violations since 2016
Eastern Navajo Agency – BIE
455 people · Groundwater · District of Columbia
Not in EPA's PFAS sampleAlso: 6 health-based violations since 2016
Bie Chemawa Indian School Water System
320 people · Groundwater · District of Columbia
Not in EPA's PFAS sampleAlso: 1 health-based violation since 2016
Dibe Yazhi Habitiin (Borrego Pass) Day School-BIE
120 people · Purchased groundwater · District of Columbia
Coliform bacteria violation
Hanaadli Huerfano Boarding School – BIE
65 people · Purchased surface water · District of Columbia
Not in EPA's PFAS sampleAlso: 1 health-based violation since 2016
Washington Aqueduct Division.
Wholesale supplier (sells water to other systems) · Surface water · District of Columbia
Not in EPA's PFAS sample

District of Columbia cities and towns

Washington

Most health-based violations since 2016

Eastern Navajo Agency – BIE
455 people · Groundwater · District of Columbia
Not in EPA's PFAS sampleAlso: 6 health-based violations since 2016
Fort Wingate Community Water System
550 people · Groundwater · District of Columbia
Not in EPA's PFAS sampleAlso: 5 health-based violations since 2016
Joint Base Anacostia – Bolling Water System
20,411 people · Purchased surface water · District of Columbia
No PFAS above limitsAlso: 5 health-based violations since 2016
Naval Station Washington – Wny Water System
16,800 people · Purchased surface water · District of Columbia
Total trihalomethanes (TTHM) violationsAlso: Coliform bacteria violation
Dibe Yazhi Habitiin (Borrego Pass) Day School-BIE
120 people · Purchased groundwater · District of Columbia
Coliform bacteria violation
Wingate Elementary School (New) – BIE
800 people · Groundwater · District of Columbia
Not in EPA's PFAS sampleAlso: 2 health-based violations since 2016
Hanaadli Huerfano Boarding School – BIE
65 people · Purchased surface water · District of Columbia
Not in EPA's PFAS sampleAlso: 1 health-based violation since 2016
Bie Chemawa Indian School Water System
320 people · Groundwater · District of Columbia
Not in EPA's PFAS sampleAlso: 1 health-based violation since 2016

All District of Columbia utilities on this site

Every District of Columbia system serving 50,000+ people or with PFAS above a federal limit, A to Z. Download all 10 systems as CSV.

D.C. Water and Sewer Authority

Questions

Does District of Columbia tap water have PFAS?

EPA tested 3 community water systems in District of Columbia for 29 PFAS between 2023 and 2025. 0 had at least one regulated PFAS detected, and 0 had an entry-point average above a 2024 federal limit. Those 0 systems serve about 0 people. Systems have until 2029 to meet the limits.

How many District of Columbia water systems have violations?

8 systems in District of Columbia had at least one health-based violation since 2016 (27 violations in total). 18 violations are currently listed as unaddressed.

Which District of Columbia water systems are over the lead action level?

0 systems had a lead 90th percentile above the 15 ppb action level in their most recent results from the last five years. Another 1 system has no lead results in EPA's database from the last five years, including 1 whose last result was above the action level. Lead depends on each home's pipes, so a test of your own tap is the only way to know your level.

Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.