Lake Marie
Seminole County, FloridaView mapDirections
Florida DEP publishes the water-quality measurements for Lake Marie. Here is what has been measured.
- Eutrophic
- Limited data
Lake Marie in Seminole County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 3.3 ft visibility. Phosphorus: 23.5 µg/L.
Lake Marie is a productive, nutrient-rich eutrophic lake in Seminole County, Florida. Overall water quality is improving over recent sampling years. Compared to the 121 other monitored lakes in Seminole County, Lake Marie ranks #62 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-01-02. Methodology: how these readings are compared.
Swimming conditions
Readings onlyBacteria tested: low
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.
Based on E. coli testing, Lake Marie never exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 0% of 16 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.
Whether Lake Marie 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 Lake Marie
These are the measurements Florida DEP publishes for Lake Marie, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Very murky, less than 3.3 ft of visibility. Phosphorus 23.5 µg/L. TSI 55.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 3.3ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 23.5µg/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. | 55 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Lake Marie
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Lake Marie typically sits around 82°F at the surface in September. Summer average is about 84°F. Usually warmest in Jun (about 84°F) and coldest in Jan (about 63°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (63°F) to its warmest (84°F).
Typical surface water temperature by month, from 16 field readings (2020–2025) via the EPA Water Quality Portal. See the full Lake Marie water temperature breakdown →
Stays via Stay22
Stays near Lake Marie
Compare lakeside cabins, hotels, and vacation rentals near Lake Marie in Seminole 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 Lake Marie
Prices for Oct 16–18, 4 adults. Change dates on the map below.
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Planning a whole trip? See where to stay at Florida’s top lakes →
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Fishing Lake Marie
Water Quality Trend: Improving
Based on 5 years of monitoring (2020–2024).
Water clarity
Improving5 years
Phosphorus
Improving-1.25 µg/L/yr5 years
Nearby Lakes in Seminole County
Frequently asked questions about Lake Marie
Where is Lake Marie?
- Lake Marie is a lake in Seminole County, Florida. Its water-quality measurements are published by Florida DEP and shown on this page as reported.
What is the water quality of Lake Marie?
- Lake Marie in Seminole County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 3.3 ft visibility. Phosphorus: 23.5 µg/L.
Is Lake Marie safe to swim in?
- Based on E. coli testing, Lake Marie never exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 0% of 16 samples across 6 seasons. That is a historical summary of past bacteria testing, not a current reading and not a swimming clearance. Bacteria levels can spike quickly after heavy rain, so whether Lake Marie is safe to swim in today is a call for Florida's water agency and the county health department; check their current beach advisories before you swim.
What is the water temperature of Lake Marie?
- Lake Marie typically sits around 82°F at the surface in September, from 16 EPA Water Quality Portal field readings (2020–2025). That is a typical value for the month, not a live reading.
Explore Lake Marie across LakeQuality
Planning a trip around Canaveral?
Lake Marie is about 35 miles from Canaveral National Seashore. Crowds there swing hard by season, so the month you pick changes both how busy the park is and what lodging costs.
Best time to visit Canaveral →More lakes in Florida
Other Lakes in Florida
Eutrophic Lakes in Florida
Where this data comes from
32 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 samples32 samples · 2020–2025
Monitoring station identifiers (1)
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.