Tap Water Quality in Washington, Washington DC (ZIP 20001)
Serving Washington, Washington DC
Is the Tap Water Safe in Washington, Washington DC?
Tap water in Washington, Washington DC (ZIP 20001) has 2 contaminants above EPA health-based guidelines (MCLGs) in at least one of the 1 city served. We recommend reviewing detailed city reports below and considering a certified water filter for additional protection.
ZIP 20001 is served by 4 water utilities providing water to Washington. Water quality varies by utility and city. Click on the cities below to see detailed reports for your specific area.
How does Washington DC water quality rank nationally? →Get your water tested in Washington DC →
Water Hardness in ZIP 20001
District of Columbia water hardness →US water hardness data →Hardness calculator & converter →US hardness map →
Water Quality Report for ZIP 20001
2 contaminants above EPA health guidelines
These levels represent the worst case across all cities in this ZIP code. Check individual city reports for specific details.
Found in Washington
Found in Washington
Worried about Bromodichloromethane in your water?
You're viewing 2 contaminants above health-based guidelines here, including Bromodichloromethane. Your own tap water can differ — upload your test (PDF or a photo) and we'll email a full plain-English reading of every number, free.
Your upload also helps us keep local water data accurate — we only ever share anonymized, area-level summaries.
Upload my testWater Utilities Serving ZIP 20001
NAVAL STATION WASHINGTON - WNY
Serves Washington; EPA holds no ZIP-level record for this system.
15,690
Water Source:
Surface water purchased
Contaminants:
31 results on file
JOINT BASE ANACOSTIA - BOLLING
Serves Washington; EPA holds no ZIP-level record for this system.
17,201
Water Source:
Surface water purchased
Contaminants:
40 results on file
WASHINGTON AQUEDUCT DIVISION.
Serves Washington; EPA holds no ZIP-level record for this system.
D.C. WATER AND SEWER AUTHORITY
Serves Washington; EPA holds no ZIP-level record for this system.
632,323
Water Source:
Surface water purchased
Contaminants:
40 results on file
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Best Water Filters for Washington (ZIP 20001)
Based on the contaminants found in your area, we recommend NSF-certified water filters that can remove the specific contaminants above health guidelines.
Find a filter certified for your water
Browse third-party-certified filters by the contaminant you care about — each list shows exactly which NSF/ANSI standard backs the claim, no marketing spin.
Browse filters by contaminantFrequently Asked Questions about Washington Tap Water
Is the tap water safe in Washington, Washington DC (ZIP 20001)?
Which water utilities serve ZIP code 20001?
How do I pay my water bill in Washington (ZIP 20001)?
What contaminants are in Washington water (ZIP 20001)?
Should I use a water filter in Washington (ZIP 20001)?
What cities are in ZIP code 20001?
How we built this page
Water-quality data on this page comes from public federal and state records for the 4 utilityies serving ZIP 20001. We refresh each utility's record whenever its underlying source publishes new data.
- Contaminants & violations: EPA Safe Drinking Water Information System (SDWIS) plus the Unregulated Contaminant Monitoring Rule (UCMR-5) for PFAS and emerging contaminants.
- Annual reports: the most recent published Consumer Confidence Report (CCR) from each utility serving this ZIP, where available.
- Service area & contact: EPA SDWIS. EPA administers the drinking-water program here directly — Washington DC has never sought state primacy.
Spotted a data issue? Use the Spotted something off? link at the bottom of the page — corrections feed back into the next data refresh. Learn more about TapWaterData.
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