St Lucie-Margaret Lake
St. Lucie County, FloridaView mapDirections
Florida DEP publishes the water-quality measurements for St Lucie-Margaret Lake. Here is what has been measured.
- Eutrophic
St Lucie-Margaret Lake in St. Lucie County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 3.8 ft visibility. Phosphorus: 22 µg/L.
St Lucie-Margaret Lake is a productive, nutrient-rich eutrophic lake in St. Lucie County, Florida. Overall water quality is declining over recent sampling years. Compared to the 4 other monitored lakes in St. Lucie County, St Lucie-Margaret Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2023-04-11. Methodology: how these readings are compared.
Swimming conditions
Readings onlyLow algae
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether St Lucie-Margaret Lake is safe to swim in today is a call for the Florida Department of Environmental Protection and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for St Lucie-Margaret Lake
These are the measurements Florida DEP publishes for St Lucie-Margaret Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Murky, only visible to about 3.8 ft. Phosphorus 22 µg/L. TSI 53.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 3.8ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 22µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 53 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
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Fishing St Lucie-Margaret Lake
Water quality readings over time
3 seasons of samples on record (2020–2022). Calling a direction takes at least 4 years of the same measurement.
Water clarity
Worsening3 years
Phosphorus
Worsening+5.25 µg/L/yr3 years
Nearby Lakes in St. Lucie County
Frequently asked questions about St Lucie-Margaret Lake
Where is St Lucie-Margaret Lake?
- St Lucie-Margaret Lake is a lake in St. Lucie County, Florida. Its water-quality measurements are published by Florida DEP and shown on this page as reported.
What is the water quality of St Lucie-Margaret Lake?
- St Lucie-Margaret Lake in St. Lucie County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 3.8 ft visibility. Phosphorus: 22 µg/L.
Is St Lucie-Margaret Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Explore St Lucie-Margaret Lake across LakeQuality
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Eutrophic Lakes in Florida
Where this data comes from
189 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_WQX189 samples · 2020–2023
Monitoring station identifiers (3)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.