| Cleanest/Best Counties |
National Average |
Dirtiest/Worst Counties |
| Percentage of Surface Waters with Impaired or Threatened Uses (state + EPA data): |
    |
| |
| Number of Impaired Waterbodies (as reported by the state): |
     |
| |
NOTE: Data limitations affect the accuracy of these rankings.
Rank counties in SOUTH CAROLINA or in the U.S. by assessed use impairments.
Rank watersheds in SOUTH CAROLINA by assessed use impairments
Rank states by assessed use impairments, impairments due to specific causes, or impairments due to specific sources