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DHEC divides South Carolina into 8 major river basins or watersheds. Together, these watersheds contain over 30,000 stream miles, 300,000 acres of lake water and 200,000  acres of estuary.

For each of the 8 basins, DHEC produces a Watershed Water Quality Assessment (WWQA) that describes a wealth of information through text and maps including: water chemistry, biological monitoring, physical characteristics, natural resources, growth potential, potential nonpoint source contributions and point source discharges.

Click on a watershed to learn more about water quality in that basin.



SC Watersheds Savannah River Basin Salkehatchie River Basin Edisto River Basin Santee River Basin PeeDee River Basin Catawta River Basin Broad River Basin Saluda River Basin

| Broad | Catawba | Edisto | Pee Dee | Salkehatchie | Saluda | Santee | Savannah |

Archived Watershed Water Quality Assessments

Did you know? The Edisto River in South Carolina is the longest free-flowing (undammed) blackwater river in North America. 


Bureau of Water . Phone: (803) 898-4300 . Fax: (803) 898-3795 . Contact Us