Dems Lake
Greene County, AlabamaView mapDirections
ADEM publishes the water-quality measurements for Dems Lake. Here is what has been measured.
- Eutrophic
Dems Lake in Greene County, Alabama has water-quality measurements published by ADEM, shown here as reported. Water clarity: 2.4 ft visibility. Phosphorus: 25 µg/L. Chlorophyll-a (algae): 13.4 µg/L.
Dems Lake is a productive, nutrient-rich eutrophic lake in Greene County, Alabama. 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. Methodology: how these readings are compared.
Swimming conditions
Readings onlyModerate algae
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Dems Lake is safe to swim in today is a call for the Alabama Department of Environmental Management and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Dems Lake
These are the measurements ADEM publishes for Dems Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Very murky, less than 2.4 ft of visibility. Phosphorus 25 µg/L. Chlorophyll-a 13.4 µg/L. TSI 57.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 2.4ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 25µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 13.4µg/L | Fair GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 57 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
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Fishing Dems Lake
Water Quality Trend: Worsening
Based on 5 years of monitoring (2014–2025).
Water clarity
Worsening5 years
Phosphorus
Stable-0.52 µg/L/yr5 years
Chlorophyll-a
Worsening+0.35 µg/L/yr5 years
Nearby Lakes in Greene County
Frequently asked questions about Dems Lake
Where is Dems Lake?
- Dems Lake is a lake in Greene County, Alabama. Its water-quality measurements are published by ADEM and shown on this page as reported.
What is the water quality of Dems Lake?
- Dems Lake in Greene County, Alabama has water-quality measurements published by ADEM, shown here as reported. Water clarity: 2.4 ft visibility. Phosphorus: 25 µg/L. Chlorophyll-a (algae): 13.4 µg/L.
Is Dems Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Explore Dems Lake across LakeQuality
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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)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.