Lake Asher
Lake Asher in Seminole County, Florida has a water quality grade of C (Fair). Water clarity: 3.9 ft visibility. Phosphorus: 45.5 µg/L.
- Clarity
- 3.9 ft
- Typical in July
- 87°F
- Type
- Eutrophic
- Trend
- → Stable
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Lake Asher is a productive, nutrient-rich eutrophic lake in Seminole County, Florida. Water quality is graded C based on 1 sampling years through 2025. Water clarity is declining over recent sampling years. Compared to the 121 other monitored lakes in Seminole County, Lake Asher ranks #103 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-07-22. Grade methodology: LakeQuality methodology.
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Swimming Safety
Grade onlyLimited data
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)
Murky, only visible to about 3.9 ft. Phosphorus level: 45.5 µg/L. Trophic State Index: 58.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.9 ft | Not graded |
| Phosphorus | 45.5 µg/L | Fair |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 58 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Lake Asher
Compare lakeside cabins, hotels, and vacation rentals near Lake Asher 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 Lake Asher
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Planning a whole trip? See where to stay at Florida’s top lakes →
Water Temperature
Lake Asher typically sits around 87°F at the surface in July. Summer average is about 87°F. Usually warmest in Jul (about 87°F) and coldest in Jan (about 62°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 39 field readings (2010–2025) via the EPA Water Quality Portal. See the full Lake Asher water temperature breakdown →
Fishing Lake Asher
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
Lake Asher 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 (0.8 km)
County Ranking
Ranked #103 of 122 lakes in Seminole County
Nearby Lakes With Higher Grades
Lake Asher 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.
Nearby Lakes in Seminole County
Frequently asked questions about Lake Asher
Where is Lake Asher?
- Lake Asher 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 Lake Asher?
- Lake Asher in Seminole County, Florida has a water quality grade of C (Fair). Water clarity: 3.9 ft visibility. Phosphorus: 45.5 µg/L.
Is Lake Asher safe to swim in?
- Generally safe for swimming, moderate water quality. Lake Asher has a water quality grade of C (Fair). Always check local health department advisories before swimming.
What is the water temperature of Lake Asher?
- Lake Asher typically sits around 87°F at the surface in July, from 39 EPA Water Quality Portal field readings (2010–2025). That is a typical value for the month, not a live reading.
Explore Lake Asher across LakeQuality
More Florida Lake Rankings
Other Grade C Lakes in Florida
Eutrophic Lakes in Florida
Where this data comes from
43 measurements from 1 monitoring station, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Submitting organization not recorded for these samples43 samples · 2020–2025
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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database