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Water system · PWSID DC0000002

D.C. WATER AND SEWER AUTHORITY

WASHINGTON, DC · ~632,323 people served

Check your exact address → WASHINGTON overview
100
Excellent
PurityRadar safety score

PWSID

DC0000002

State

District of Columbia

City

WASHINGTON

Population served

632,323

Primary source

SWP

Score history

No change since tracking began Jun 18, 2026.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 100

2 score updates logged since tracking began Jun 18, 2026. Each future EPA re-score adds a point.

PFAS & contaminant readings

Latest detections from EPA’s UCMR5 monitoring (through Jul 2024). Levels in parts per trillion (ppt).

PFPeA

4.4 ppt

limit —

No federal limit

PFHxA

3.1 ppt

limit —

No federal limit

Violations & enforcement

32

Violations on record

0

Unaddressed

13

Health-based

29

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Apr 2023. Official EPA record →

Monitoring & reporting · EPA contaminant 0200 began Jan 2023 Resolved
Monitoring · Lead & Copper Rule began Jan 2023 Resolved
Monitoring · Lead & Copper Rule began Dec 2022 Resolved
Monitoring & reporting · EPA contaminant 0200 began Dec 2022 Resolved
Monitoring & reporting · EPA contaminant 1006 began Jan 2006 Resolved
Other · EPA contaminant 7000 began Jul 2005 Resolved
Treatment technique · Lead & Copper Rule health-based began Oct 2004 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Oct 2004 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Oct 2004 Resolved
Max contaminant level (MCL) · Total coliform health-based began Sep 2004 Resolved
Other · EPA contaminant 7000 began Oct 2003 Resolved
Monitoring & reporting · Lead & Copper Rule began Jul 2003 Resolved

Recent enforcement actions

  • EPA/federal action · EO+ Apr 2023
  • EPA/federal action · EFJ Apr 2023
  • EPA/federal action · EOX Mar 2023
  • EPA/federal action · EOX May 2007
  • EPA/federal action · EF- May 2007
  • EPA/federal action · EOX Mar 2006
  • EPA/federal action · EIA Mar 2006
  • EPA/federal action · EOX Mar 2006

Area water-quality monitoring

Environmental monitoring (rivers, wells, intakes) recorded in this system’s service area in the EPA/USGS Water Quality Portal since 2018 — source/ambient water, not finished tap water. Context for the watershed, not a reading from your tap.

ContaminantMedian · max · samples

Nitrate

3 stations · latest Sep 2023

0.716 · max 1.87 mg/l as N · 594

Copper

3 stations · latest Dec 2023

3.3 · max 17.6 ug/l · 259

Lead

4 stations · latest Dec 2023

0.217 · max 5.3 ug/l · 244

Arsenic

9 stations · latest May 2021

7.3 · max 8.6 ug/l · 9

Fluoride

2 stations · latest May 2021

0.08 · max 0.09 mg/l · 2

Manganese

2 stations · latest May 2021

194 · max 241 ug/l · 2

Source: Water Quality Portal (EPA/USGS/state agencies). Values are as-reported and aren’t health thresholds.

This profile is built from EPA public records for system DC0000002 — SDWIS violations and UCMR5 PFAS sampling. The score is system-level and can’t account for your home’s plumbing (older pipes can add lead at the tap). For health decisions, check your exact address, read the utility’s Consumer Confidence Report, and confirm with your provider.