Forsyth County Lake Quality
Georgia, 3 lakes, average grade C (Fair)
Forsyth County has 3 graded lakes — a thin enough sample that one or two stressed lakes can move the county average noticeably. Use the per-lake pages below for what actually matters. The county average is C — the middle of the rubric, with one or two lakes pulling the average up or down depending on year.
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 Sidney Lanier (C) is the cleanest in the county.
Quick Answers for Forsyth County
Planning a trip? Check special fishing regulations for Lake Sidney Lanier — or check the official Georgia fishing regulations.
All Lakes in Forsyth County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Lake Sidney Lanier | C | 9.2 ft | - |
| 2 | Lake Sidney Lanier | C | 9.2 ft | - |
| 3 | Lake Sidney Lanier | C | 7.6 ft | - |
Other Counties in Georgia
See how Forsyth County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 36 states.
Where to stay near Forsyth County
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Source: EPA National Aquatic Resource Surveys, 2026.