Theresactr Lake
Orange County, FloridaView mapDirections
Florida DEP publishes the water-quality measurements for Theresactr Lake. Here is what has been measured.
- Eutrophic
- Limited data
Theresactr Lake in Orange County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 3.6 ft visibility. Phosphorus: 70 µg/L.
Theresactr Lake is a productive, nutrient-rich eutrophic lake in Orange County, Florida. Overall water quality is declining over recent sampling years. Compared to the 319 other monitored lakes in Orange County, Theresactr Lake ranks #295 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2021-07-29. Methodology: how these readings are compared.
Swimming conditions
Readings onlyLimited data
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 Theresactr 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 Theresactr Lake
These are the measurements Florida DEP publishes for Theresactr 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 3.6 ft. Phosphorus 70 µg/L. TSI 62.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 3.6ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 70µg/L | Poor 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. | 62 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Theresactr Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Theresactr Lake typically sits around 88°F at the surface in July. Summer average is about 87°F. Usually warmest in Jul (about 88°F) and coldest in Jan (about 65°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (65°F) to its warmest (88°F).
Typical surface water temperature by month, from 30 field readings (2019–2021) via the EPA Water Quality Portal. See the full Theresactr Lake water temperature breakdown →
Stays via Stay22
Stays near Theresactr Lake
Compare lakeside cabins, hotels, and vacation rentals near Theresactr 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. The water-quality readings cover nutrients and algae, not lodging. Cabins and rentals around Theresactr Lake are listed below.
Top-rated places to stay near Theresactr Lake
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 Theresactr Lake
Water Quality Trend: Worsening
Based on 6 years of monitoring (2020–2025).
Water clarity
Worsening6 years
Phosphorus
Worsening+1.76 µg/L/yr6 years
Nearby Lakes in Orange County
Frequently asked questions about Theresactr Lake
Where is Theresactr Lake?
- Theresactr Lake is a lake in Orange County, Florida. Its water-quality measurements are published by Florida DEP and shown on this page as reported.
What is the water quality of Theresactr Lake?
- Theresactr Lake in Orange County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 3.6 ft visibility. Phosphorus: 70 µg/L.
Is Theresactr Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
What is the water temperature of Theresactr Lake?
- Theresactr Lake typically sits around 88°F at the surface in July, from 30 EPA Water Quality Portal field readings (2019–2021). That is a typical value for the month, not a live reading.
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Where this data comes from
18 measurements from 1 monitoring station, 2020–2021. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Submitting organization not recorded for these samples18 samples · 2020–2021
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.