Dems Lake
Greene County, AlabamaView mapDirections
Nutrients and algae sit mid-range for this region.
- Eutrophic
- #3 of 3 in the county
Dems Lake in Greene County, Alabama has a water quality grade of C (Fair). Water clarity: 2.4 ft visibility. Phosphorus: 25 µg/L. Chlorophyll-a (algae): 13.4 µg/L.
- Clarity
- 2.4 ft
- Type
- Eutrophic
- Phosphorus
- 25 µg/L
- Chlorophyll-a
- 13.4 µg/L
- Trend
- ↓ Declining
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Stays near Dems Lake
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Watch Dems Lake’s letter
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Dems Lake is a productive, nutrient-rich eutrophic lake in Greene County, Alabama. Water quality is graded C based on 2 sampling years through 2025. Overall water quality is declining over recent sampling years. Compared to the 2 other monitored lakes in Greene County, Dems Lake ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, ADEM, last sampled 2025-10-27. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyModerate
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
The C is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: C (Fair)
Very murky, less than 2.4 ft of visibility. Phosphorus 25 µg/L. Chlorophyll-a 13.4 µg/L. TSI 57. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.4 ft | Not graded |
| Phosphorus | 25 µg/L | Good |
| Chlorophyll-a (Algae) | 13.4 µg/L | Fair |
| Trophic State Index (TSI) | 57 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Fishing Dems Lake
Water Quality Trend: ↓ Declining
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.031 m/yr | 5 |
| Phosphorus | → Stable | -0.52 µg/L/yr | 5 |
| Chlorophyll-a | ↓ Declining | +0.35 µg/L/yr | 5 |
County Ranking
Ranked #3 of 3 lakes in Greene County
Nearby Lakes With Higher Grades
Dems Lake holds Grade C. One nearby lake has a higher nutrient-and-algae grade — useful for a swim day, not a reason to skip lodging here.
See full comparison →Nearby Lakes in Greene County
Frequently asked questions about Dems Lake
Where is Dems Lake?
- Dems Lake is a lake in Greene County, Alabama. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Dems Lake?
- Dems Lake in Greene County, Alabama has a water quality grade of C (Fair). Water clarity: 2.4 ft visibility. Phosphorus: 25 µg/L. Chlorophyll-a (algae): 13.4 µg/L.
Is Dems Lake safe to swim in?
- The C is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Explore Dems Lake across LakeQuality
More Alabama Lake Rankings
Other Grade C Lakes in Alabama
Where this data comes from
141 measurements from 1 monitoring station, 2014–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- ALABAMA DEPT. OF ENVIRONMENTAL MANAGEMENT - WATER QUALITY DATA
21AWIC141 samples · 2014–2025
Analytical methods
- Phosphorus by Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
- 2120 B ~ Color in Water by Visual Comparison
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.