STATE REPORT DC 1644 HEALTH VIOLATIONS

District of Columbia Water: 9K Violations — 286 ZIPs

286 ZIP codes · 4 water systems · IPC plumbing code · Updated 2026-06-04

Data: EPA SDWIS, NWS, State plumbing boards, Rewiring America Last verified: 2026-06-04

286
ZIP Codes
4
Water Systems
274
ZIPs with Violations
IPC
Plumbing Code
C · 68
Avg Safety Score
#23
of 51 States
6%
ZIPs Rated A or B
96%
ZIPs with Violations
C
District of Columbia average: 68/100 — ranked #23 of 51 states. 1 points above the national average (67). 6% of ZIP codes scored A or B.

While not every District of Columbia utility has violations, the statewide average falls below federal compliance benchmarks.

Score Distribution

How District of Columbia's 286 ZIP codes are distributed across safety grades.

0
A
17
B
257
C
12
D
0
F
85-10070-8455-6940-540-39

Home Safety Scores by State

Loading map…
F (0-49) D (50-64) C (65-74) B (75-84) A (85+)

Data: EPA SDWIS, FEMA NFIP, EPA Radon, USGS Earthquake Hazards, NIFC Wildfire • 2026-06-04

Top 10 Safest ZIP Codes in District of Columbia

Highest Home Safety Scores in the state.

#ZIP CodeCityCountyScoreGrade
1 20003 WashingtonDistrict of Columbia 72 B
2 20004 WashingtonDistrict of Columbia 72 B
3 20005 WashingtonDistrict of Columbia 72 B
4 20006 WashingtonDistrict of Columbia 72 B
5 20024 WashingtonDistrict of Columbia 72 B
6 20027 WashingtonDistrict of Columbia 72 B
7 20032 WashingtonDistrict of Columbia 72 B
8 20036 WashingtonDistrict of Columbia 72 B
9 20037 WashingtonDistrict of Columbia 72 B
10 20230 WashingtonDistrict of Columbia 72 B

10 Lowest-Scoring ZIP Codes in District of Columbia

#ZIP CodeCityCountyScoreGradeViolations
1 56972 Parcel Return ServiceDistrict of Columbia 50 D 0
2 56944 Parcel Return ServiceDistrict of Columbia 50 D 0
3 56933 Parcel Return ServiceDistrict of Columbia 50 D 0
4 56920 Parcel Return ServiceDistrict of Columbia 50 D 0
5 56915 Parcel Return ServiceDistrict of Columbia 50 D 0
6 56901 Parcel Return ServiceDistrict of Columbia 50 D 0
7 20398 Washington Navy YardDistrict of Columbia 50 D 0
8 20391 Washington Navy YardDistrict of Columbia 50 D 0
9 20388 Washington Navy YardDistrict of Columbia 50 D 0
10 20376 Washington Navy YardDistrict of Columbia 50 D 0

County Rankings

Water quality breakdown by county. 3 counties with data in District of Columbia.

Loading county map…
F (0-49) D (50-64) C (65-74) B (75-84) A (85+)

County-level aggregation of ZIP code safety scores • EPA SDWIS, FEMA NFIP, EPA Radon, USGS, NIFC

CountyAvg ScoreGradeZIPsBest ZIPWorst ZIP
District of Columbia 68 C 284 20003 (72) 56972 (50)
Dorchester 72 B 1 20405 (72) 20405 (72)
Plymouth 72 B 1 20470 (72) 20470 (72)

Most Common Contaminants in District of Columbia

Contaminant / RuleCategoryZIPs AffectedViolationsHealth Risk
Lead Inorganic 274 548 No
Copper Inorganic 274 274 No
Haloacetic Acids (HAA5) Disinfection Byproducts 274 822 Yes
Stage 1 DBP Rule Treatment Technique 274 548 No
Surface Water Treatment Rule Treatment Technique 274 1096 No
Lead and Copper Rule Treatment Technique 274 1096 No
Consumer Confidence Report Rule Reporting 274 2466 Yes
E. coli Microbiological 274 1918 Yes

Overview

We track water quality, weather alerts, plumbing regulations, and energy rebates for 286 ZIP codes across District of Columbia, covering 4 community water systems that serve approximately 632,323 people.

274 of 286 ZIP codes (96%) have recorded EPA violations. 1644 health-based violations have been documented.

Plumbing Regulations

District of Columbia follows the International Plumbing Code (2021 edition).

  • Plumbing code: IPC (2021)
  • Homeowner DIY: Licensed plumber required
  • Water heater permit: Required
  • Annual backflow test: Required

Full District of Columbia regulations →

Areas with Most Violations

ZIP Code City Safety Score Violations Health-Based System
20001 Washington C 33 6 D.c. Water and Sewer Authority
20002 Washington C 33 6 D.c. Water and Sewer Authority
20003 Washington B 33 6 D.c. Water and Sewer Authority
20004 Washington B 33 6 D.c. Water and Sewer Authority
20005 Washington B 33 6 D.c. Water and Sewer Authority
20006 Washington B 33 6 D.c. Water and Sewer Authority
20007 Washington C 33 6 D.c. Water and Sewer Authority
20008 Washington C 33 6 D.c. Water and Sewer Authority
20009 Washington C 33 6 D.c. Water and Sewer Authority
20010 Washington C 33 6 D.c. Water and Sewer Authority

Areas with No Violations

ZIP Code City Safety Score System Population
20373 Naval Anacost Annex D D.C. WATER AND SEWER AUTHORITY 632,323
20374 Washington Navy Yard D D.C. WATER AND SEWER AUTHORITY 632,323
20376 Washington Navy Yard D D.C. WATER AND SEWER AUTHORITY 632,323
20388 Washington Navy Yard D D.C. WATER AND SEWER AUTHORITY 632,323
20391 Washington Navy Yard D D.C. WATER AND SEWER AUTHORITY 632,323
20398 Washington Navy Yard D D.C. WATER AND SEWER AUTHORITY 632,323
56901 Parcel Return Service D D.C. WATER AND SEWER AUTHORITY 632,323
56915 Parcel Return Service D D.C. WATER AND SEWER AUTHORITY 632,323
56920 Parcel Return Service D D.C. WATER AND SEWER AUTHORITY 632,323
56933 Parcel Return Service D D.C. WATER AND SEWER AUTHORITY 632,323

Home Safety Score

Average Home Safety Score for District of Columbia: C (68/100)

Lead & Copper

  • Average lead level (90th percentile): 0.0010 mg/L (EPA action level: 0.015 mg/L)
  • 0 ZIP codes exceed the EPA lead action level

Radon Risk

  • High risk (Zone 1): 0 ZIP codes (0%)
  • Moderate risk (Zone 2): 0 ZIP codes
  • Low risk (Zone 3): 0 ZIP codes

ZIP Code Reports for District of Columbia

Largest Communities

ZIP Code City Population Safety Grade Violations
20001 Washington 667,325 C 33
20002 Washington 667,325 C 33
20003 Washington 667,325 B 33
20004 Washington 667,325 B 33
20005 Washington 667,325 B 33
20006 Washington 667,325 B 33
20007 Washington 667,325 C 33
20008 Washington 667,325 C 33
20009 Washington 667,325 C 33
20010 Washington 667,325 C 33
20011 Washington 667,325 C 33
20012 Washington 667,325 C 33
20013 Washington 667,325 C 33
20015 Washington 667,325 C 33
20016 Washington 667,325 C 33
20017 Washington 667,325 C 33
20018 Washington 667,325 C 33
20019 Washington 667,325 C 33
20020 Washington 667,325 C 33
20022 Washington 667,325 C 33

Lowest Safety Scores

ZIP Code City Score Grade Violations
20373 Naval Anacost Annex 50 D 0
20374 Washington Navy Yard 50 D 0
20376 Washington Navy Yard 50 D 0
20388 Washington Navy Yard 50 D 0
20391 Washington Navy Yard 50 D 0

Highest Safety Scores

ZIP Code City Score Grade Violations
20003 Washington 72 B 33
20004 Washington 72 B 33
20005 Washington 72 B 33
20006 Washington 72 B 33
20024 Washington 72 B 33

All 286 ZIP Codes in District of Columbia

Data Sources

Updated daily.

Frequently Asked Questions

Is the water safe to drink in District of Columbia?

District of Columbia has 4 community water systems serving 632,323 people across 286 ZIP codes. There are 9,042 recorded violations, including 1644 health-based. 274 of 286 ZIP codes have at least one violation.

What plumbing code does District of Columbia follow?

District of Columbia follows the IPC plumbing code. A licensed plumber is generally required for plumbing work.

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