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North Carolina Water Quality
624
Utilities in database
9.4M
Residents served
35%
On private wells
2
Key contaminants tracked
Drinking Water in North Carolina
North Carolina has 624 community water systems serving approximately 9.4 million residents. Primary water sources include surface water. The most commonly reported contaminants include disinfection byproducts, lead. 35% of North Carolina residents rely on private wells. NCDEQ holds primary enforcement authority under the Safe Drinking Water Act.
Utilities in North Carolina
Top 20 of 624 by populationCharlotte Water
NC0160010 · 1,163,701 served
City of Raleigh
NC0392010 · 640,000 served
City of Winston-salem
NC0234010 · 388,060 served
City of Durham
NC0332010 · 322,083 served
City of Greensboro
NC0241010 · 319,588 served
Town of Cary
NC0392020 · 224,000 served
Fayetteville Public Works Comm
NC0326010 · 215,590 served
Cfpua-wilmington
NC0465010 · 198,740 served
Union County Water System
NC0190413 · 167,554 served
City of Asheville
NC0111010 · 157,431 served
Onslow Wtr and Sewer Authority
NC0467035 · 156,755 served
Davidson Water Inc
NC0229025 · 153,632 served
Brunswick County Water System
NC0410045 · 142,227 served
City of Concord
NC0113010 · 120,548 served
City of High Point
NC0241020 · 118,399 served
Harnett Regional Water
NC0343045 · 116,892 served
Greenville Utilities Comm
NC0474010 · 103,140 served
Two Rivers Utilities
NC0136010 · 93,877 served
Johnston Co-west
NC0351070 · 92,365 served
Orange Water & Sewer Authority
NC0368010 · 86,500 served
Key Contaminant Concerns in North Carolina
Lead
Lead is a naturally occurring heavy metal that was widely used in plumbing infrastructure until it was banned for new installations in 1986. An estimated 9.2 million lead service lines still connect homes to public water mains across the United States, along with millions of homes with lead solder in their internal plumbing.
DBPs
When utilities add chlorine to water to kill pathogens, it reacts with dissolved organic matter — leaves, algae, soil — to produce disinfection byproducts (DBPs). Over 600 DBPs have been identified. The EPA regulates two groups: total trihalomethanes (TTHMs, including chloroform) and haloacetic acids (HAA5). DBP levels tend to be highest in surface water systems and in warm months when organic matter is elevated.
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Data source: Utility data from EPA SDWIS. 624 active community water systems ingested. CCR contaminant data ingestion in progress.
Last updated: 2026-04-17