Unnamedsem Lake
Unnamedsem Lake in Seminole County, Florida is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 3.6 ft visibility. Phosphorus: 12 µg/L.
- Clarity
- 3.6 ft
- Trend
- → Stable
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Why Unnamedsem Lake has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Unnamedsem Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded water clarity and phosphorus, but not algae (chlorophyll-a).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by FDEP and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Unnamedsem Lake is a lake in Seminole County, Florida. Water clarity is improving over recent sampling years.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2021-09-30. Grade methodology: LakeQuality methodology.
Watch Unnamedsem Lake water quality
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Unnamedsem Lake
These readings exist but are not enough for an A–F grade — see why.
Murky, only visible to about 3.6 ft. Phosphorus level: 12 µg/L. Trophic State Index: 49.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.6 ft | Not graded |
| Phosphorus | 12 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 49 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Unnamedsem Lake
Compare lakeside cabins, hotels, and vacation rentals near Unnamedsem 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 Unnamedsem Lake
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Planning a whole trip? See where to stay at Florida’s top lakes →
Fishing Unnamedsem Lake
Water Quality Trend: → Stable
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.146 m/yr | 6 |
| Phosphorus | ↓ Declining | +2.15 µg/L/yr | 5 |
EPA Impairment Status
Unnamedsem Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4C).
Causes of impairment
Source: EPA ATTAINS assessment unit FL3009J · Official waterbody report · Matched by proximity (1.85 km)
Graded lakes near Unnamedsem Lake
Unnamedsem Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Seminole County
Frequently asked questions about Unnamedsem Lake
Where is Unnamedsem Lake?
- Unnamedsem Lake is a lake in Seminole County, Florida. LakeQuality has not rated this lake (UNRATED) — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
What is the water quality grade for Unnamedsem Lake?
- Unnamedsem Lake in Seminole County, Florida is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 3.6 ft visibility. Phosphorus: 12 µg/L.
Is Unnamedsem Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Unnamedsem Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Explore Unnamedsem Lake across LakeQuality
Planning a trip around Canaveral?
Unnamedsem Lake is about 32 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 Lakes in Florida
Mesotrophic Lakes in Florida
Where this data comes from
2 measurements from 1 monitoring station, 2021. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- FL Dept. of Environmental Protection
21FLGW_WQX2 samples · 2021
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