EPA data as of Oct 2026 · page updated 2026-10-30
District of Columbia: drinking water & radon
District of Columbia has 10 active community water systems. Since 2016, 8 reported health-based violations; 1 had a latest lead result above 15 ppb; 0 measured PFOA or PFOS at or above 4 ppt.
Water systems10
With violations8
Radon zone 1 ZIPs0
ZIPs likely on wells0
Radon zones in District of Columbia
tap a countyZone 1 · highestZone 2 · moderateZone 3 · low
Most health-based violations
| Eastern Navajo Agency - Bie 455 people | 6 |
| Fort Wingate Community 550 people | 5 |
| Joint Base Anacostia - Bolling 20,411 people | 5 |
| Naval Station Washington - Wny 16,800 people | 4 |
| Dibe Yazhi Habitiin (Borrego Pass) Day School-Bie 120 people | 3 |
| Wingate Elementary School (New) - Bie 800 people | 2 |
| Bie Chemawa Indian School 320 people | 1 |
| Hanaadli Huerfano Boarding School - Bie 65 people | 1 |
Highest latest lead (90th percentile)
| Eastern Navajo Agency - Bie 455 people | 3.8 ppb |
| Bie Chemawa Indian School 320 people | 3.5 ppb |
| Wingate Elementary School (New) - Bie 800 people | 3.2 ppb |
| Dibe Yazhi Habitiin (Borrego Pass) Day School-Bie 120 people | 2.5 ppb |
| D.C. Water and Sewer Authority 632,323 people | 2 ppb |
| Hanaadli Huerfano Boarding School - Bie 65 people | 0.9 ppb |
| Naval Station Washington - Wny 16,800 people | 0.8 ppb |
| Fort Wingate Community 550 people | 0.5 ppb |
| Joint Base Anacostia - Bolling 20,411 people | 0.5 ppb |
Largest systems
| D.C. Water and Sewer Authority 632,323 people | 632,323 |
| Joint Base Anacostia - Bolling 20,411 people | 20,411 |
| Naval Station Washington - Wny 16,800 people | 16,800 |
| Wingate Elementary School (New) - Bie 800 people | 800 |
| Fort Wingate Community 550 people | 550 |
| Eastern Navajo Agency - Bie 455 people | 455 |
| Bie Chemawa Indian School 320 people | 320 |
| Dibe Yazhi Habitiin (Borrego Pass) Day School-Bie 120 people | 120 |
| Hanaadli Huerfano Boarding School - Bie 65 people | 65 |
| Washington Aqueduct Division. 0 people | 0 |
All ZIP codes in District of Columbia
271 ZIP codes.
20001Washington20002Washington20003Washington20005Washington20006Washington20007Washington20008Washington20009Washington20010Washington20011Washington20012Washington20013Washington20015Washington20016Washington20017Washington20018Washington20019Washington20020Washington20022Washington20024Washington20026Washington20027Washington20029Washington20030Washington20032Washington20033Washington20035Washington20036Washington20037Washington20038Washington20039Washington20040Washington20042Washington20043Washington20044Washington20045Washington20047Washington20049Washington20050Washington20052Washington20053Washington20055Washington20056Washington20057Washington20058Washington20060Washington20061Washington20062Washington20063Washington20064Washington20065Washington20066Washington20067Washington20068Washington20069Washington20070Washington20071Washington20073Washington20074Washington20075Washington20076Washington20077Washington20078Washington20080Washington20081Washington20082Washington20090Washington20091Washington20201Washington20202Washington20203Washington20204Washington20206Washington20207Washington20208Washington20210Washington20211Washington20212Washington20213Washington20214Washington20215Washington20216Washington20217Washington20218Washington20219Washington20220Washington20221Washington20222Washington20223Washington20224Washington20226Washington20227Washington20228Washington20229Washington20230Washington20232Washington20233Washington20235Washington20237Washington20238Washington20239Washington20240Washington20241Washington20242Washington20244Washington20245Washington20250Washington20251Washington20252Washington20254Washington20260Washington20261Washington20262Washington20265Washington20266Washington20268Washington20270Washington20277Washington20289Washington20299Washington20301Washington20303Washington20306Washington20310Washington20314Washington20317Washington20318Washington20319Washington20330Washington20340Washington20350Washington20355Washington20370Washington20372Washington20373Naval Anacost Annex20375Washington20376Washington Navy Yard20380Washington20388Washington Navy Yard20389Washington20390Washington20391Washington Navy Yard20392Washington20393Washington20394Washington20395Washington20398Washington Navy Yard20401Washington20402Washington20403Washington20404Washington20405Washington20406Washington20407Washington20408Washington20410Washington20411Washington20412Washington20413Washington20414Washington20415Washington20416Washington20417Washington20418Washington20419Washington20420Washington20421Washington20422Washington20423Washington20424Washington20425Washington20426Washington20427Washington20428Washington20429Washington20431Washington20433Washington20434Washington20435Washington20436Washington20437Washington20439Washington20440Washington20441Washington20442Washington20444Washington20447Washington20451Washington20453Washington20456Washington20460Washington20463Washington20468Washington20469Washington20470Washington20472Washington20500Washington20501Washington20502Washington20503Washington20504Washington20505Washington20506Washington20507Washington20508Washington20509Washington20510Washington20511Washington20520Washington20521Washington20522Washington20523Washington20524Washington20525Washington20526Washington20527Washington20528Washington20529Washington20530Washington20531Washington20533Washington20534Washington20535Washington20536Washington20537Washington20538Washington20539Washington20540Washington20541Washington20542Washington20543Washington20544Washington20546Washington20547Washington20548Washington20549Washington20551Washington20552Washington20553Washington20554Washington20555Washington20557Washington20559Washington20560Washington20565Washington20566Washington20570Washington20571Washington20572Washington20573Washington20575Washington20576Washington20577Washington20578Washington20579Washington20580Washington20581Washington20585Washington20586Washington20590Washington20591Washington20593Washington20594Washington20597Washington20599Washington56901Washington56915Washington56920Washington56933Washington56944Washington56972Washington
What this is — and isn’t. These are records your water utility and state reported to the EPA, and the EPA’s radon map for your county. They describe the system and the area, not the water from your own tap or the air in your home. For that, read your utility’s annual Consumer Confidence Report and test: lead and radon tests are inexpensive.
Questions
How many water systems in District of Columbia have violations?
8 of 10 active community water systems in District of Columbia reported at least one health-based violation since 2016 (EPA SDWIS).
What is the radon risk in District of Columbia?
No ZIP codes are in EPA radon zone 1, 0 in zone 2 and 271 in zone 3. EPA recommends testing every home.