Clarendon County Lake Quality
South Carolina, 1 lake, average grade B (Good)
Only 1 lakes in Clarendon County carry an active grade. The county-level summary is therefore representative of those specific lakes, not necessarily of every water body in the county. The county-wide average lands at B — solid water quality with most lakes carrying clear summer transparency and low-to-moderate phosphorus.
Most of the county's monitored lakes are shallow — under 50 feet — which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed. Lake Marion (B) is the cleanest in the county.
Quick Answers for Clarendon County
Planning a trip? Check special fishing regulations for Lake Marion — or check the official South Carolina fishing regulations.
All Lakes in Clarendon County
1 lake1 graded lake
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | BLake MarionClarendon | B | 4.3 ft | 22 µg/L | 9.8 µg/L | No recent samples | Not recorded |
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Other Counties in South Carolina
See how Clarendon County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 39 states and 2 Canadian provinces.
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Source: EPA National Aquatic Resource Surveys, 2026.