Clear Lake South
Clear Lake South in Orange County, Florida has a water quality grade of B (Good). Water clarity: 3.8 ft visibility. Phosphorus: 20.5 µg/L.
- Clarity
- 3.8 ft
- Typical in August
- 87°F
- Type
- Eutrophic
- Trend
- ↓ Declining
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Clear Lake South is a productive, nutrient-rich eutrophic lake in Orange County, Florida. Water quality is graded B based on 1 sampling years through 2025. Overall water quality is declining over recent sampling years. Compared to the 319 other monitored lakes in Orange County, Clear Lake South ranks #129 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-04-24. 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, Clear Lake South never exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 0% of 24 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 3.8 ft. Phosphorus level: 20.5 µg/L. Trophic State Index: 53.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.8 ft | Not graded |
| Phosphorus | 20.5 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 53 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Clear Lake South
Compare lakeside cabins, hotels, and vacation rentals near Clear Lake South in Orange 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 Clear Lake South
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Planning a whole trip? See where to stay at Florida’s top lakes →
Water Temperature
Clear Lake South typically sits around 87°F at the surface in August. Summer average is about 87°F. Usually warmest in Jul (about 87°F) and coldest in Jan (about 62°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 115 field readings (2010–2025) via the EPA Water Quality Portal. See the full Clear Lake South water temperature breakdown →
Fishing Clear Lake South
Water Quality Trend: ↓ Declining
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | -0.053 m/yr | 6 |
| Phosphorus | ↓ Declining | +13.69 µg/L/yr | 6 |
EPA Impairment Status
Clear Lake South 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 FL3169G5 · Official waterbody report · Matched by proximity (1.2 km)
County Ranking
Ranked #129 of 320 lakes in Orange County
Nearby Lakes in Orange County
Frequently asked questions about Clear Lake South
Where is Clear Lake South?
- Clear Lake South is a lake in Orange County, Florida. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Clear Lake South?
- Clear Lake South in Orange County, Florida has a water quality grade of B (Good). Water clarity: 3.8 ft visibility. Phosphorus: 20.5 µg/L.
Is Clear Lake South safe to swim in?
- Based on E. coli testing, Clear Lake South never exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 0% of 24 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. Clear Lake South 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 Clear Lake South?
- Clear Lake South typically sits around 87°F at the surface in August, from 115 EPA Water Quality Portal field readings (2010–2025). That is a typical value for the month, not a live reading.
Explore Clear Lake South across LakeQuality
More Florida Lake Rankings
Other Grade B Lakes in Florida
Eutrophic Lakes in Florida
Where this data comes from
39 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 samples39 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