Nettielkwsh Lake
Nettielkwsh Lake in Lake County, Florida has a water quality grade of B (Good). Water clarity: 5.4 ft visibility. Phosphorus: 40 µg/L.
- Clarity
- 5.4 ft
- Type
- Eutrophic
- Trend
- → Stable
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Nettielkwsh Lake is a productive, nutrient-rich eutrophic lake in Lake County, Florida. Water quality is graded B based on 1 sampling years through 2025. Water clarity is declining over recent sampling years. Compared to the 127 other monitored lakes in Lake County, Nettielkwsh Lake ranks #36 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-08-18. 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, Nettielkwsh Lake never exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 0% of 7 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)
Murky, only visible to about 5.4 ft. Phosphorus level: 40 µg/L. Trophic State Index: 55.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.4 ft | Not graded |
| Phosphorus | 40 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 55 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Nettielkwsh Lake
Compare lakeside cabins, hotels, and vacation rentals near Nettielkwsh 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 Nettielkwsh Lake
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Fishing Nettielkwsh Lake
Water Quality Trend: → Stable
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -1.079 m/yr | 6 |
| Phosphorus | ↑ Improving | -3 µg/L/yr | 6 |
EPA Impairment Status
Nettielkwsh Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit FL2821B · Official waterbody report · Matched by proximity (2.1 km)
County Ranking
Ranked #36 of 128 lakes in Lake County
Nearby Lakes in Lake County
Frequently asked questions about Nettielkwsh Lake
Where is Nettielkwsh Lake?
- Nettielkwsh 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 Nettielkwsh Lake?
- Nettielkwsh Lake in Lake County, Florida has a water quality grade of B (Good). Water clarity: 5.4 ft visibility. Phosphorus: 40 µg/L.
Is Nettielkwsh Lake safe to swim in?
- Based on E. coli testing, Nettielkwsh Lake never exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 0% of 7 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. Nettielkwsh 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.
Explore Nettielkwsh Lake across LakeQuality
More Florida Lake Rankings
Other Grade B Lakes in Florida
Eutrophic Lakes in Florida
Where this data comes from
17 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 samples17 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