Seminole-Asher Lake
Seminole-Asher Lake in Seminole County, Florida has a water quality grade of C (Fair). Water clarity: 3 ft visibility. Phosphorus: 54 µg/L.
- Clarity
- 3 ft
- Type
- Eutrophic
- Trend
- → Stable
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Seminole-Asher Lake is a productive, nutrient-rich eutrophic lake in Seminole County, Florida. Water quality is graded C based on 1 sampling years through 2022. 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. Grade methodology: LakeQuality methodology.
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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.
Generally safe for swimming, moderate water quality
Water Quality Grade: C (Fair)
Very murky, less than 3 ft of visibility. Phosphorus level: 54 µg/L. Trophic State Index: 61.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3 ft | Not graded |
| Phosphorus | 54 µg/L | Fair |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 61 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Seminole-Asher Lake
Compare lakeside cabins, hotels, and vacation rentals near Seminole-Asher Lake in Seminole County, Florida — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Seminole-Asher Lake
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Fishing Seminole-Asher Lake
Water Quality Trend: → Stable
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.221 m/yr | 6 |
| Phosphorus | ↑ Improving | -1.2 µg/L/yr | 5 |
EPA Impairment Status
Seminole-Asher Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit FL3004A · Official waterbody report · Matched by proximity (0.86 km)
County Ranking
Ranked #100 of 122 lakes in Seminole County
Nearby Lakes With Higher Grades
Seminole-Asher 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 Seminole County
Frequently asked questions about Seminole-Asher Lake
Where is Seminole-Asher Lake?
- Seminole-Asher Lake is a lake in Seminole County, Florida. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Seminole-Asher Lake?
- Seminole-Asher Lake in Seminole County, Florida has a water quality grade of C (Fair). Water clarity: 3 ft visibility. Phosphorus: 54 µg/L.
Is Seminole-Asher Lake safe to swim in?
- Generally safe for swimming, moderate water quality. Seminole-Asher Lake has a water quality grade of C (Fair). Always check local health department advisories before swimming.
Explore Seminole-Asher Lake across LakeQuality
More Florida Lake Rankings
Other Grade C Lakes in Florida
Eutrophic Lakes in Florida
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)
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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database