Grassy Lake
Grassy Lake in Seminole County, Florida has a water quality grade of B (Good). Water clarity: 5.5 ft visibility. Phosphorus: 15 µg/L.
- Clarity
- 5.5 ft
- Typical in September
- 84°F
- Type
- Mesotrophic
- Trend
- ↑ Improving
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Grassy Lake is a mesotrophic lake in Seminole County, Florida. Water quality is graded B based on 1 sampling years through 2025. Overall water quality is improving over recent sampling years. Compared to the 121 other monitored lakes in Seminole County, Grassy Lake ranks #57 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-03-27. Grade methodology: LakeQuality methodology.
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Swimming Safety
Grade onlyBacteria A
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.
Based on E. coli testing, Grassy Lake never exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 0% of 19 samples across 6 seasons.
This is a historical summary of past testing, not a current condition — bacteria levels change quickly, especially after rain. Always check Florida’s current beach and health-department advisories before swimming.
Water Quality Grade: B (Good)
Murky, only visible to about 5.5 ft. Phosphorus level: 15 µg/L. Trophic State Index: 48.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.5 ft | Not graded |
| Phosphorus | 15 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 48 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Grassy Lake
Compare lakeside cabins, hotels, and vacation rentals near Grassy 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 Grassy Lake
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Water Temperature
Grassy Lake typically sits around 84°F at the surface in September. Summer average is about 84°F. Usually warmest in Jun (about 84°F) and coldest in Dec (about 67°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 19 field readings (2020–2025) via the EPA Water Quality Portal. See the full Grassy Lake water temperature breakdown →
Fishing Grassy Lake
Water Quality Trend: ↑ Improving
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | -0.057 m/yr | 6 |
| Phosphorus | ↑ Improving | -2.5 µg/L/yr | 5 |
EPA Impairment Status
Grassy 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 (1.48 km)
County Ranking
Ranked #57 of 122 lakes in Seminole County
Nearby Lakes in Seminole County
Frequently asked questions about Grassy Lake
Where is Grassy Lake?
- Grassy 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 Grassy Lake?
- Grassy Lake in Seminole County, Florida has a water quality grade of B (Good). Water clarity: 5.5 ft visibility. Phosphorus: 15 µg/L.
Is Grassy Lake safe to swim in?
- Based on E. coli testing, Grassy Lake never exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 0% of 19 samples across 6 seasons. That works out to a bacteria swim-safety grade of A — a historical summary of past testing, not a current reading. Grassy Lake has a water quality grade of B (Good). Bacteria levels can spike quickly after heavy rain, so always check Florida's current beach and health-department advisories before you swim.
What is the water temperature of Grassy Lake?
- Grassy Lake typically sits around 84°F at the surface in September, from 19 EPA Water Quality Portal field readings (2020–2025). That is a typical value for the month, not a live reading.
Explore Grassy Lake across LakeQuality
More Florida Lake Rankings
Other Grade B Lakes in Florida
Mesotrophic Lakes in Florida
Where this data comes from
38 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 samples38 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