Private Well Water Testing in South Carolina
County-by-county USGS area-risk estimates for private wells across South Carolina — arsenic exceedance probability and private-well population — plus how to test your own well at a South Carolina-certified laboratory.
South Carolina private-well risk summary
Counties covered
46
South Carolina counties with modeled risk data.
People on private wells
area estimate876,656
estimated across covered South Carolina counties.
Average arsenic risk
area estimate2%
average modeled chance a well exceeds 10 µg/L arsenic across covered counties.
South Carolina counties
- Lexington County1% arsenic exceedance (area estimate)47,434 people on private wells
- Horry County3% arsenic exceedance (area estimate)45,388 people on private wells
- York County1% arsenic exceedance (area estimate)45,021 people on private wells
- Berkeley County1% arsenic exceedance (area estimate)43,988 people on private wells
- Florence County2% arsenic exceedance (area estimate)43,769 people on private wells
- Orangeburg County2% arsenic exceedance (area estimate)31,956 people on private wells
- Spartanburg County1% arsenic exceedance (area estimate)31,252 people on private wells
- Greenville County1% arsenic exceedance (area estimate)30,558 people on private wells
- Aiken County1% arsenic exceedance (area estimate)29,391 people on private wells
- Sumter County2% arsenic exceedance (area estimate)27,146 people on private wells
- Richland County2% arsenic exceedance (area estimate)26,582 people on private wells
- Charleston County3% arsenic exceedance (area estimate)26,492 people on private wells
- Williamsburg County1% arsenic exceedance (area estimate)23,606 people on private wells
- Colleton County2% arsenic exceedance (area estimate)23,547 people on private wells
- Darlington County4% arsenic exceedance (area estimate)21,815 people on private wells
- Clarendon County1% arsenic exceedance (area estimate)21,643 people on private wells
- Dorchester County1% arsenic exceedance (area estimate)20,749 people on private wells
- Laurens County1% arsenic exceedance (area estimate)19,955 people on private wells
- Anderson County1% arsenic exceedance (area estimate)19,700 people on private wells
- Chesterfield County2% arsenic exceedance (area estimate)18,300 people on private wells
- Chester County2% arsenic exceedance (area estimate)17,897 people on private wells
- Newberry County2% arsenic exceedance (area estimate)16,233 people on private wells
- Greenwood County1% arsenic exceedance (area estimate)15,601 people on private wells
- Lancaster County2% arsenic exceedance (area estimate)15,145 people on private wells
- Beaufort County4% arsenic exceedance (area estimate)14,254 people on private wells
- Saluda County1% arsenic exceedance (area estimate)13,867 people on private wells
- Jasper County2% arsenic exceedance (area estimate)12,866 people on private wells
- Cherokee County2% arsenic exceedance (area estimate)12,496 people on private wells
- Abbeville County1% arsenic exceedance (area estimate)12,032 people on private wells
- Georgetown County2% arsenic exceedance (area estimate)11,944 people on private wells
- Kershaw County2% arsenic exceedance (area estimate)11,897 people on private wells
- Calhoun County2% arsenic exceedance (area estimate)10,923 people on private wells
- Fairfield County1% arsenic exceedance (area estimate)10,740 people on private wells
- Marion County2% arsenic exceedance (area estimate)10,341 people on private wells
- Barnwell County2% arsenic exceedance (area estimate)10,324 people on private wells
- Marlboro County2% arsenic exceedance (area estimate)10,246 people on private wells
- Hampton County1% arsenic exceedance (area estimate)10,228 people on private wells
- Oconee County1% arsenic exceedance (area estimate)9,599 people on private wells
- Edgefield County1% arsenic exceedance (area estimate)9,441 people on private wells
- Dillon County1% arsenic exceedance (area estimate)9,348 people on private wells
- Lee County2% arsenic exceedance (area estimate)8,451 people on private wells
- Pickens County1% arsenic exceedance (area estimate)6,928 people on private wells
- Bamberg County2% arsenic exceedance (area estimate)6,416 people on private wells
- Allendale County2% arsenic exceedance (area estimate)4,239 people on private wells
- Union County1% arsenic exceedance (area estimate)3,870 people on private wells
- McCormick County1% arsenic exceedance (area estimate)3,038 people on private wells
Find a South Carolina-certified testing lab
Get your well tested at a South Carolina-certified laboratory. We list certification programs by state.
These figures are USGS area estimates: statistical groundwater models describing how likely elevated contaminant levels are across a county. They are not designed to predict the concentration in any single well. Only testing your own well reveals its water quality.
By TapWaterData Editorial
Stay Informed About Your Water Quality
Get EPA reports, filter recommendations, and safety alerts for your area.
Join 10,000+ people protecting their families. Unsubscribe anytime.