Seminole-Asher Lake
Seminole County, FloridaView mapDirections
Florida DEP publishes the water-quality measurements for Seminole-Asher Lake. Here is what has been measured.
- Eutrophic
Seminole-Asher Lake in Seminole County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 3 ft visibility. Phosphorus: 54 µg/L.
Seminole-Asher Lake is a productive, nutrient-rich eutrophic lake in Seminole County, Florida. Water clarity is declining over recent sampling years. Compared to the 121 other monitored lakes in Seminole County, Seminole-Asher Lake ranks #100 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2022-04-26. 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 Seminole-Asher Lake is safe to swim in today is a call for the Florida Department of Environmental Protection and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Seminole-Asher Lake
These are the measurements Florida DEP publishes for Seminole-Asher 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 3 ft of visibility. Phosphorus 54 µg/L. TSI 61.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 3ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 54µg/L | Fair GoodFairPoor |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 61 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
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Fishing Seminole-Asher Lake
Water Quality Trend: Stable
Based on 6 years of monitoring (2020–2025).
Water clarity
Worsening6 years
Phosphorus
Improving-1.2 µg/L/yr5 years
Nearby Lakes in Seminole County
Frequently asked questions about Seminole-Asher Lake
Where is Seminole-Asher Lake?
- Seminole-Asher Lake is a lake in Seminole County, Florida. Its water-quality measurements are published by Florida DEP and shown on this page as reported.
What is the water quality of Seminole-Asher Lake?
- Seminole-Asher Lake in Seminole County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 3 ft visibility. Phosphorus: 54 µg/L.
Is Seminole-Asher Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Explore Seminole-Asher Lake across LakeQuality
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Where this data comes from
138 measurements from 3 monitoring stations, 2020–2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- FLORIDA LAKEWATCH
21FLKWAT_WQX138 samples · 2020–2022
Monitoring station identifiers (3)
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.