Lake Hartwell is a mesotrophic lake in Hart County, Georgia. Water quality is graded B based on 1 sampling years through 2025. Compared to the 1 other monitored lakes in Hart County, Lake Hartwell ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Georgia DNR, last sampled 2025-10-07. Grade methodology: LakeGrade methodology.
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Good clarity, visible to about 13.5 ft. Chlorophyll-a: 3.9 µg/L. Trophic State Index: 42.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 13.5 ft | A |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 3.9 µg/L | B |
| Trophic State Index (TSI) | 42 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Lake Hartwell
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Fishing Lake Hartwell
Location
County Ranking
Ranked #1 of 2 lakes in Hart County
Nearby Lakes in Hart County
Explore Lake Hartwell across LakeGrade
More Georgia Lake Rankings
Other Grade B Lakes in Georgia
Rabun County · Clarity: 10.8 ft
Columbia County · Clarity: 7.9 ft
Rabun County · Clarity: 12.5 ft
Hall County · Good
Hall County · Clarity: 12.8 ft
Gwinnett County · Clarity: 13.3 ft
Mesotrophic Lakes in Georgia
More records, surveys & data sources
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2025-10-07
Monitoring stations: 1