Charlotte-Sunapee Lake
Charlotte-Sunapee Lake in Charlotte County, Florida has a water quality grade of D (Nutrient-rich). Water clarity: 1.8 ft visibility. Phosphorus: 129.5 µg/L.
- Clarity
- 1.8 ft
- Type
- Hypereutrophic
- Trend
- ↑ Improving
Grade D measures nutrients and algae, not whether this is a good place for a cabin trip. Cabins and rentals near Charlotte-Sunapee Lake →
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Charlotte-Sunapee Lake is a highly nutrient-loaded hypereutrophic lake in Charlotte County, Florida. Water quality is graded D based on 1 sampling years through 2024. Overall water quality is improving over recent sampling years. Compared to the 14 other monitored lakes in Charlotte County, Charlotte-Sunapee Lake ranks #14 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2024-09-01. Grade methodology: LakeQuality methodology.
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Swimming Safety
Grade onlyElevated nutrients
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.
Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum
Water Quality Grade: D (Nutrient-rich)
Very murky, less than 1.8 ft of visibility. Phosphorus level: 129.5 µg/L. Trophic State Index: 71.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.8 ft | Not graded |
| Phosphorus | 129.5 µg/L | Poor |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 71 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Where to stay near Charlotte-Sunapee Lake
Compare lakeside cabins, hotels, and vacation rentals near Charlotte-Sunapee Lake in Charlotte 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. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around Charlotte-Sunapee Lake are listed below.
Top-rated places to stay near Charlotte-Sunapee 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 →
Fishing Charlotte-Sunapee Lake
Water Quality Trend: ↑ Improving
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.075 m/yr | 3 |
| Phosphorus | ↑ Improving | -3 µg/L/yr | 3 |
EPA Impairment Status
Charlotte-Sunapee Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit FL2052 · Official waterbody report · Matched by proximity (1.5 km)
County Ranking
Ranked #14 of 15 lakes in Charlotte County
Nearby Lakes With Higher Grades
Charlotte-Sunapee Lake holds Grade D. One nearby lake has a higher nutrient-and-algae grade — useful for a swim day, not a reason to skip lodging here.
See full comparison →Nearby Lakes in Charlotte County
Frequently asked questions about Charlotte-Sunapee Lake
Where is Charlotte-Sunapee Lake?
- Charlotte-Sunapee Lake is a lake in Charlotte County, Florida. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Charlotte-Sunapee Lake?
- Charlotte-Sunapee Lake in Charlotte County, Florida has a water quality grade of D (Nutrient-rich). Water clarity: 1.8 ft visibility. Phosphorus: 129.5 µg/L.
Is Charlotte-Sunapee Lake safe to swim in?
- Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum. Charlotte-Sunapee Lake has a water quality grade of D (Nutrient-rich). Always check local health department advisories before swimming.
Explore Charlotte-Sunapee Lake across LakeQuality
More Florida Lake Rankings
Other Grade D Lakes in Florida
Hypereutrophic Lakes in Florida
Where this data comes from
112 measurements from 2 monitoring stations, 2022–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- FLORIDA LAKEWATCH
21FLKWAT_WQX112 samples · 2022–2024
Monitoring station identifiers (2)
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