Seminole-Lost Lake
Seminole-Lost Lake in Seminole County, Florida has a water quality grade of B (Good). Water clarity: 5 ft visibility. Phosphorus: 17 µg/L.
- Clarity
- 5 ft
- Type
- Mesotrophic
- Trend
- ↑ Improving
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Seminole-Lost Lake is a mesotrophic lake in Seminole County, Florida. Water quality is graded B based on 1 sampling years through 2024. Overall water quality is improving over recent sampling years. Compared to the 121 other monitored lakes in Seminole County, Seminole-Lost Lake ranks #20 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2024-12-21. Grade methodology: LakeQuality methodology.
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Swimming Safety
Grade onlyLow algae
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.
Good for swimming, clear water with low algae levels
Water Quality Grade: B (Good)
Murky, only visible to about 5 ft. Phosphorus level: 17 µg/L. Trophic State Index: 49.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5 ft | Not graded |
| Phosphorus | 17 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 49 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Seminole-Lost Lake
Compare lakeside cabins, hotels, and vacation rentals near Seminole-Lost 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-Lost Lake
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Planning a whole trip? See where to stay at Florida’s top lakes →
Fishing Seminole-Lost Lake
Water Quality Trend: ↑ Improving
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.2 m/yr | 5 |
| Phosphorus | ↑ Improving | -1.8 µg/L/yr | 5 |
EPA Impairment Status
Seminole-Lost Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit FL2994V1 · Official waterbody report · Matched by proximity (0.9 km)
County Ranking
Ranked #20 of 122 lakes in Seminole County
Nearby Lakes in Seminole County
Frequently asked questions about Seminole-Lost Lake
Where is Seminole-Lost Lake?
- Seminole-Lost Lake is a lake in Seminole County, Florida. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Seminole-Lost Lake?
- Seminole-Lost Lake in Seminole County, Florida has a water quality grade of B (Good). Water clarity: 5 ft visibility. Phosphorus: 17 µg/L.
Is Seminole-Lost Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Seminole-Lost Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
Explore Seminole-Lost Lake across LakeQuality
Planning a trip around Canaveral?
Seminole-Lost Lake is about 35 miles from Canaveral National Seashore. Crowds there swing hard by season, so the month you pick changes both how busy the park is and what lodging costs.
Best time to visit Canaveral →More Florida Lake Rankings
Other Grade B Lakes in Florida
Mesotrophic Lakes in Florida
Where this data comes from
281 measurements from 3 monitoring stations, 2020–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- FLORIDA LAKEWATCH
21FLKWAT_WQX281 samples · 2020–2024
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