Mary Jane Lake
Mary Jane Lake in Orange County, Florida has a water quality grade of B (Good). Water clarity: 1.6 ft visibility. Phosphorus: 28.5 µg/L.
- Clarity
- 1.6 ft
- Typical in August
- 87°F
- Type
- Eutrophic
- Trend
- → Stable
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Mary Jane Lake is a productive, nutrient-rich eutrophic lake in Orange County, Florida. Water quality is graded B based on 1 sampling years through 2024. Water clarity is improving over recent sampling years. Compared to the 319 other monitored lakes in Orange County, Mary Jane Lake ranks #101 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2024-12-02. 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, Mary Jane Lake never exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 0% of 28 samples across 7 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)
Very murky, less than 1.6 ft of visibility. Phosphorus level: 28.5 µg/L. Trophic State Index: 61.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.6 ft | Not graded |
| Phosphorus | 28.5 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 61 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Mary Jane Lake
Compare lakeside cabins, hotels, and vacation rentals near Mary Jane Lake 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 Mary Jane Lake
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Planning a whole trip? See where to stay at Florida’s top lakes →
Water Temperature
Mary Jane Lake typically sits around 87°F at the surface in August. Summer average is about 86°F. Usually warmest in Jul (about 87°F) and coldest in Jan (about 59°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 66 field readings (2010–2024) via the EPA Water Quality Portal. See the full Mary Jane Lake water temperature breakdown →
Fishing Mary Jane Lake
Water Quality Trend: → Stable
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.2 m/yr | 5 |
| Phosphorus | ↓ Declining | +3.25 µg/L/yr | 5 |
EPA Impairment Status
Mary Jane 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 FL3171A · Official waterbody report
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Mary Jane Lake under Clean Water Act (NPDES) discharge permits.
- Orlando AirportOrlando · 2.2 mi away · NPDES FLG110905
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 #101 of 320 lakes in Orange County
Nearby Lakes in Orange County
Frequently asked questions about Mary Jane Lake
Where is Mary Jane Lake?
- Mary Jane Lake 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 Mary Jane Lake?
- Mary Jane Lake in Orange County, Florida has a water quality grade of B (Good). Water clarity: 1.6 ft visibility. Phosphorus: 28.5 µg/L.
Is Mary Jane Lake safe to swim in?
- Based on E. coli testing, Mary Jane Lake never exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 0% of 28 samples across 7 seasons. That works out to a bacteria swim-safety grade of A — a historical summary of past testing, not a current reading. Mary Jane Lake 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 Mary Jane Lake?
- Mary Jane Lake typically sits around 87°F at the surface in August, from 66 EPA Water Quality Portal field readings (2010–2024). That is a typical value for the month, not a live reading.
Explore Mary Jane Lake across LakeQuality
Planning a trip around Canaveral?
Mary Jane Lake is about 38 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 Florida Lake Rankings
Other Grade B Lakes in Florida
Eutrophic Lakes in Florida
Where this data comes from
57 measurements from 1 monitoring station, 2020–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Submitting organization not recorded for these samples57 samples · 2020–2024
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
Regulated discharger data from EPA ECHO (ICIS-NPDES)