Griffinwsh Lake
Griffinwsh Lake in Lake County, Florida has a water quality grade of B (Good). Water clarity: 3.3 ft visibility. Phosphorus: 33 µg/L.
- Clarity
- 3.3 ft
- Typical in August
- 86°F
- Type
- Eutrophic
- Trend
- ↑ Improving
Next lake in Lake County
Swipe left or right on this bar to open the next or previous lake.
Griffinwsh Lake is a productive, nutrient-rich eutrophic lake in Lake 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 127 other monitored lakes in Lake County, Griffinwsh Lake ranks #86 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-01-27. Grade methodology: LakeQuality methodology.
Watch Griffinwsh Lake water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
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, Griffinwsh Lake never exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 0% of 16 samples across 3 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)
Very murky, less than 3.3 ft of visibility. Phosphorus level: 33 µg/L. Trophic State Index: 57.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.3 ft | Not graded |
| Phosphorus | 33 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 57 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Griffinwsh Lake
Compare lakeside cabins, hotels, and vacation rentals near Griffinwsh Lake in Lake 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 Griffinwsh Lake
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Florida’s top lakes →
Water Temperature
Griffinwsh Lake typically sits around 86°F at the surface in August. Summer average is about 89°F. Usually warmest in Jun (about 91°F) and coldest in Jan (about 61°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 23 field readings (2011–2025) via the EPA Water Quality Portal. See the full Griffinwsh Lake water temperature breakdown →
Fishing Griffinwsh Lake
Water Quality Trend: ↑ Improving
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | +0.02 m/yr | 5 |
| Phosphorus | ↑ Improving | -4.35 µg/L/yr | 5 |
EPA Impairment Status
Griffinwsh 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 FL2818 · Official waterbody report · Matched by proximity (1.58 km)
County Ranking
Ranked #86 of 128 lakes in Lake County
Nearby Lakes in Lake County
Frequently asked questions about Griffinwsh Lake
Where is Griffinwsh Lake?
- Griffinwsh Lake is a lake in Lake County, Florida. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Griffinwsh Lake?
- Griffinwsh Lake in Lake County, Florida has a water quality grade of B (Good). Water clarity: 3.3 ft visibility. Phosphorus: 33 µg/L.
Is Griffinwsh Lake safe to swim in?
- Based on E. coli testing, Griffinwsh Lake never exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 0% of 16 samples across 3 seasons. That works out to a bacteria swim-safety grade of A — a historical summary of past testing, not a current reading. Griffinwsh 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 Griffinwsh Lake?
- Griffinwsh Lake typically sits around 86°F at the surface in August, from 23 EPA Water Quality Portal field readings (2011–2025). That is a typical value for the month, not a live reading.
Explore Griffinwsh Lake across LakeQuality
More Florida Lake Rankings
Other Grade B Lakes in Florida
Eutrophic Lakes in Florida
Where this data comes from
34 measurements from 1 monitoring station, 2023–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Submitting organization not recorded for these samples34 samples · 2023–2025
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