Dems Lake is a productive, nutrient-rich eutrophic lake in Sumter County, Alabama. Water quality is graded B based on 2 sampling years through 2025. Compared to the 2 other monitored lakes in Sumter County, Dems Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Alabama DNR, last sampled 2025-10-27. Grade methodology: LakeGrade methodology.
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Very murky, less than 2.7 ft of visibility. Phosphorus level: 24 µg/L. Chlorophyll-a: 14.2 µg/L. Trophic State Index: 56.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.7 ft | F |
| Phosphorus | 24 µg/L | B |
| Chlorophyll-a (Algae) | 14.2 µg/L | C |
| Trophic State Index (TSI) | 56 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Dems Lake
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Fishing Dems Lake
Location
County Ranking
Ranked #1 of 3 lakes in Sumter County
Nearby Lakes in Sumter County
Explore Dems Lake across LakeGrade
More Alabama Lake Rankings
Other Grade B Lakes in Alabama
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: 2025-10-27
Monitoring stations: 1