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South Carolina Water Quality
300
Utilities in database
4.7M
Residents served
30%
On private wells
2
Key contaminants tracked
Drinking Water in South Carolina
South Carolina has 300 community water systems serving approximately 4.7 million residents. Primary water sources include surface water. The most commonly reported contaminants include disinfection byproducts, lead. 30% of South Carolina residents rely on private wells. DHEC holds primary enforcement authority under the Safe Drinking Water Act.
Utilities in South Carolina
Top 20 of 300 by populationGreenville Water (2310001)
SC2310001 · 396,265 served
Charleston Water System (sc1010001)
SC1010001 · 327,422 served
Columbia City of (sc4010001)
SC4010001 · 319,500 served
Gsw&sa (sc2620004)
SC2620004 · 252,840 served
Spartanburg Water System (4210001)
SC4210001 · 166,364 served
Bjw&sa (0720003)
SC0720003 · 145,634 served
Bcwsa Sangaree W/d (0820002)
SC0820002 · 95,345 served
Mt Pleasant Water Works (1010002)
SC1010002 · 91,500 served
Sjwd Middle Tyger Wtp (4220006)
SC4220006 · 87,259 served
Rock Hill City of (sc4610002)
SC4610002 · 84,504 served
Summerville Cpw (sc1810003)
SC1810003 · 81,750 served
Florence City of (sc2110001)
SC2110001 · 79,745 served
Lancaster County W&sd (sc2920001)
SC2920001 · 79,107 served
Greer Cpw (sc2310005)
SC2310005 · 54,024 served
Sumter City of (sc4310001)
SC4310001 · 53,070 served
Darlington County W&sa (sc1620001)
SC1620001 · 52,288 served
Greenwood Cpw (2410001)
SC2410001 · 52,022 served
Myrtle Beach City of (sc2610001)
SC2610001 · 49,375 served
Joint Municipal Wsc (sc3220003)
SC3220003 · 47,838 served
Orangeburg Dpu (sc3810001)
SC3810001 · 46,896 served
Key Contaminant Concerns in South 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.
South Carolina Water FAQs
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Data source: Utility data from EPA SDWIS. 300 active community water systems ingested. CCR contaminant data ingestion in progress.
Last updated: 2026-04-19