South Carolina Water Quality
Drinking water data for all 46 counties.
Avg Water Score
64.9
State Grade
C
Counties with Data
46
of 46 total
All South Carolina Counties
| County | Water Score |
|---|---|
| Allendale County | 86.0 |
| Barnwell County | 86.0 |
| Calhoun County | 86.0 |
| Chester County | 86.0 |
| Clarendon County | 86.0 |
| Darlington County | 86.0 |
| Dillon County | 86.0 |
| Edgefield County | 86.0 |
| Florence County | 86.0 |
| Hampton County | 86.0 |
| Jasper County | 86.0 |
| Kershaw County | 86.0 |
| Lancaster County | 86.0 |
| Lee County | 86.0 |
| Marion County | 86.0 |
| Marlboro County | 86.0 |
| Orangeburg County | 86.0 |
| Greenville County | 71.8 |
| Spartanburg County | 71.5 |
| Anderson County | 71.1 |
| Horry County | 68.4 |
| Laurens County | 68.4 |
| Greenwood County | 68.2 |
| Oconee County | 67.8 |
| Richland County | 64.8 |
| Sumter County | 64.8 |
| Newberry County | 63.8 |
| Charleston County | 63.2 |
| Pickens County | 63.0 |
| Dorchester County | 62.3 |
| York County | 61.3 |
| Beaufort County | 59.3 |
| Aiken County | 59.2 |
| Fairfield County | 56.0 |
| Lexington County | 53.8 |
| Georgetown County | 52.7 |
| Berkeley County | 51.4 |
| Colleton County | 50.1 |
| Cherokee County | 43.7 |
| Bamberg County | 38.0 |
| Chesterfield County | 28.8 |
| Abbeville County | 26.8 |
| Williamsburg County | 25.4 |
| Saluda County | 24.2 |
| McCormick County | 12.8 |
| Union County | 12.3 |
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Frequently Asked Questions
Which county in South Carolina has the best water quality?
Allendale County has the highest water quality score in South Carolina at 86.0/100 (Grade: A), based on EPA SDWIS data.
Which county in South Carolina has the most water violations?
Union County has among the lowest water quality scores in South Carolina at 12.3/100. See the individual county page for detailed violation history.
Is the tap water safe to drink in South Carolina?
South Carolina has an average water quality score of 64.9/100 based on EPA Safe Drinking Water Act compliance data. Individual county scores vary — check your specific county's page for detailed information.
What contaminants are found in South Carolina water supplies?
Drinking water quality varies by county and water system. The EPA Safe Drinking Water Information System (SDWIS) tracks violations for contaminants like lead, nitrates, bacteria, and disinfection byproducts. See individual county pages for specific contaminant and violation history.
Data Source
Water quality data sourced from the EPA Safe Drinking Water Information System (SDWIS) via the ECHO enforcement database. Scores reflect compliance history and health-based violation counts.
Disclaimer: This data is informational only. It is not health, legal, or professional advice. For concerns about your specific water supply, contact your local water utility.