Secretlk Lake
Secretlk Lake in Seminole County, Florida has a water quality grade of B (Good). Water clarity: 4.6 ft visibility. Phosphorus: 21 µg/L.
- Clarity
- 4.6 ft
- Typical in August
- 90°F
- Type
- Eutrophic
- Trend
- ↑ Improving
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Secretlk Lake is a productive, nutrient-rich eutrophic lake in Seminole County, Florida. Water quality is graded B based on 1 sampling years through 2023. Overall water quality is improving over recent sampling years. Compared to the 121 other monitored lakes in Seminole County, Secretlk Lake ranks #87 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2023-11-28. 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.
Good for swimming, clear water with low algae levels
Water Quality Grade: B (Good)
Murky, only visible to about 4.6 ft. Phosphorus level: 21 µg/L. Trophic State Index: 52.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.6 ft | Not graded |
| Phosphorus | 21 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 52 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Secretlk Lake
Compare lakeside cabins, hotels, and vacation rentals near Secretlk 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 Secretlk Lake
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Water Temperature
Secretlk Lake typically sits around 90°F at the surface in August. Summer average is about 87°F. Usually warmest in Aug (about 90°F) and coldest in Feb (about 71°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 23 field readings (2019–2023) via the EPA Water Quality Portal. See the full Secretlk Lake water temperature breakdown →
Fishing Secretlk Lake
Water Quality Trend: ↑ Improving
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.118 m/yr | 5 |
| Phosphorus | ↑ Improving | -1.8 µg/L/yr | 5 |
EPA Impairment Status
Secretlk Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5A).
Causes of impairment
Source: EPA ATTAINS assessment unit FL2994K · Official waterbody report · Matched by proximity (0.67 km)
County Ranking
Ranked #87 of 122 lakes in Seminole County
Nearby Lakes in Seminole County
Frequently asked questions about Secretlk Lake
Where is Secretlk Lake?
- Secretlk 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 Secretlk Lake?
- Secretlk Lake in Seminole County, Florida has a water quality grade of B (Good). Water clarity: 4.6 ft visibility. Phosphorus: 21 µg/L.
Is Secretlk Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Secretlk Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
What is the water temperature of Secretlk Lake?
- Secretlk Lake typically sits around 90°F at the surface in August, from 23 EPA Water Quality Portal field readings (2019–2023). That is a typical value for the month, not a live reading.
Explore Secretlk Lake across LakeQuality
More Florida Lake Rankings
Other Grade B Lakes in Florida
Eutrophic Lakes in Florida
Where this data comes from
14 measurements from 1 monitoring station, 2022–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Submitting organization not recorded for these samples14 samples · 2022–2023
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