Water quality · North Carolina
Water quality in North Carolina
4 of the 17 North Carolina ZIPs matched to an EPA SDWIS community water system report a health-based violation in the last 3 years. SDWIS reports the system serving the county, never an address-level test, and never private wells.
Last verified 2026-09-24 · methodology
Water quality by ZIP code in North Carolina
The largest community water system EPA lists for each ZIP's county, and its health-based violations in the last 3 years.
| ZIP | Largest system | Health-based violations |
|---|---|---|
| 28202CharlotteMecklenburg County | CHARLOTTE WATER | None |
| 27601RaleighWake County | RALEIGH, CITY OF | None |
| 27514Chapel HillOrange County | ORANGE WATER & SEWER AUTHORITY | None |
| 28403WilmingtonNew Hanover County | CFPUA-WILMINGTON | None |
| 28801AshevilleBuncombe County | ASHEVILLE CITY OF | 2 |
| 27401GreensboroGuilford County | GREENSBORO, CITY OF | None |
| 28207Charlotte (Myers Park)Mecklenburg County | CHARLOTTE WATER | None |
| 27517PittsboroChatham County | CHATHAM CO-NORTH | 1 |
| 27402GreensboroGuilford County | GREENSBORO, CITY OF | None |
| 28704Arden (NC, Asheville S)Buncombe County | ASHEVILLE CITY OF | 2 |
| 27511Cary (NC)Wake County | RALEIGH, CITY OF | None |
| 27709Research Triangle ParkDurham County | DURHAM, CITY OF | None |
| 28804Asheville (North)Buncombe County | ASHEVILLE CITY OF | 2 |
| 28078Huntersville (NC)Mecklenburg County | CHARLOTTE WATER | None |
| 28277Charlotte (Ballantyne)Mecklenburg County | CHARLOTTE WATER | None |
| 27607Raleigh (West)Wake County | RALEIGH, CITY OF | None |
| 28036Davidson (NC)Mecklenburg County | CHARLOTTE WATER | None |
County-level figures from EPA SDWIS, joined to each ZIP by county. None of them is a measurement at a specific address.
What lands here
Pages show the largest community water system on record for the ZIP's county, its PWSID and population served, and its health-based and total violations in the last 3 years. Lead and copper sampling results are not shown; your utility's annual water quality report (CCR) has them.
Source & refresh
EPA SDWIS. Refreshed quarterly (federal mandate). Primary source →
North Carolina top concern
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See North Carolina state page for the full state-level rollup across all 12 dimensions.
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