St Lucie-de Witt Lake
St Lucie-de Witt Lake in St. Lucie County, Florida has a water quality grade of C (Fair). Water clarity: 2.7 ft visibility. Phosphorus: 46 µg/L.
- Clarity
- 2.7 ft
- Type
- Eutrophic
- Trend
- ↓ Declining
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St Lucie-de Witt Lake is a productive, nutrient-rich eutrophic lake in St. Lucie County, Florida. Water quality is graded C based on 1 sampling years through 2023. Overall water quality is declining over recent sampling years. Compared to the 4 other monitored lakes in St. Lucie County, St Lucie-de Witt Lake ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2023-04-14. Grade methodology: LakeQuality methodology.
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Swimming Safety
Grade onlyModerate
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.
Generally safe for swimming, moderate water quality
Water Quality Grade: C (Fair)
Very murky, less than 2.7 ft of visibility. Phosphorus level: 46 µg/L. Trophic State Index: 61.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.7 ft | Not graded |
| Phosphorus | 46 µg/L | Fair |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 61 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near St Lucie-de Witt Lake
Compare lakeside cabins, hotels, and vacation rentals near St Lucie-de Witt Lake in St. Lucie 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 St Lucie-de Witt Lake
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Fishing St Lucie-de Witt Lake
Water Quality Trend: ↓ Declining
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.9 m/yr | 3 |
| Phosphorus | ↓ Declining | +5.25 µg/L/yr | 3 |
Regulated Pollution Sources Nearby
3 EPA-permitted facilities operate within about 5 miles of St Lucie-de Witt Lake under Clean Water Act (NPDES) discharge permits. 2 facilities have a reported Clean Water Act violation in the past three years.
- Ircud - South County Demin Concentrate WtpVero Beach · 2.6 mi away · NPDES FL0037940Recent violation
- Spanish Lakes Country Club Village Ro Wtp Discharge FacilityFort Pierce · 4 mi away · NPDES FL0345547Recent violation
- Spanish Lakes Fairways - Ro Wtp Discharge FacilityFort Pierce · 4 mi away · NPDES FL0140023
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
County Ranking
Ranked #4 of 5 lakes in St. Lucie County
Nearby Lakes With Higher Grades
St Lucie-de Witt Lake holds Grade C. 3 nearby lakes hold higher nutrient-and-algae grades — useful for a swim day, not a reason to skip lodging here.
See full comparison →Nearby Lakes in St. Lucie County
Frequently asked questions about St Lucie-de Witt Lake
Where is St Lucie-de Witt Lake?
- St Lucie-de Witt Lake is a lake in St. Lucie County, Florida. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for St Lucie-de Witt Lake?
- St Lucie-de Witt Lake in St. Lucie County, Florida has a water quality grade of C (Fair). Water clarity: 2.7 ft visibility. Phosphorus: 46 µg/L.
Is St Lucie-de Witt Lake safe to swim in?
- Generally safe for swimming, moderate water quality. St Lucie-de Witt Lake has a water quality grade of C (Fair). Always check local health department advisories before swimming.
Explore St Lucie-de Witt Lake across LakeQuality
More Florida Lake Rankings
Other Grade C Lakes in Florida
Eutrophic Lakes in Florida
Where this data comes from
183 measurements from 3 monitoring stations, 2020–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- FLORIDA LAKEWATCH
21FLKWAT_WQX183 samples · 2020–2023
Monitoring station identifiers (3)
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
Regulated discharger data from EPA ECHO (ICIS-NPDES)