District of Columbia Water Quality & Safety Report
1 ZIP codes · 4 water systems · IPC plumbing code · Updated 2026-03-16
Data: EPA SDWIS, NWS, State plumbing boards, Rewiring America Last verified: 2026-03-16
Overview
We track water quality, weather alerts, plumbing regulations, and energy rebates for 1 ZIP codes across District of Columbia, covering 4 community water systems that serve approximately 632,323 people.
1 of 1 ZIP codes (100%) have recorded EPA violations. 9 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 →
Energy & Water Rebates
Across 1 tracked ZIP codes in District of Columbia, residents have access to an average of 2 water-related rebate programs — including incentives for heat pump water heaters, efficient fixtures, and plumbing upgrades.
Check rebates for your ZIP code →
Areas with Most Violations
| ZIP Code | City | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|---|
| 20001 | Washington | — | 70 | 9 | D.C. WATER AND SEWER AUTHORITY |
Lead & Copper
- 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
All 1 ZIP Codes in District of Columbia
- 20001 (Washington) — 70 violations ⚠
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Regulations: State plumbing boards, ICC, IAPMO
- Rebates: Rewiring America
Updated daily.