Thonotosas Lake
Hillsborough County, FloridaView mapDirections
No nutrient or algae sampling on record from Florida DEP for this lake.
- Impaired · Algal growth
- Limited data
Thonotosas Lake in Hillsborough County, Florida has water-quality measurements published by Florida DEP, shown here as reported.
Thonotosas Lake is a lake in Hillsborough County, Florida. Water clarity is improving over recent sampling years.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2024-04-17. Methodology: how these readings are compared.
Swimming conditions
No readingRecreation use not supported
Nutrient and algae readings are not a swimming clearance. Thonotosas Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, impaired biota (cause unknown), nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Whether Thonotosas 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 Thonotosas Lake
These are the measurements Florida DEP publishes for Thonotosas Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data.
Ask about Thonotosas Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Thonotosas Lake typically sits around 82°F at the surface in October. Summer average is about 83°F. Usually warmest in Jun (about 83°F) and coldest in Apr (about 76°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (76°F) to its warmest (83°F).
Typical surface water temperature by month, from 8 field readings (2012–2024) via the EPA Water Quality Portal. See the full Thonotosas Lake water temperature breakdown →
Stays via Stay22
Stays near Thonotosas Lake
Compare lakeside cabins, hotels, and vacation rentals near Thonotosas Lake in Hillsborough 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 Thonotosas Lake
Prices for Oct 16–18, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Florida’s top lakes →
Follow Thonotosas Lake’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
Fishing Thonotosas Lake
Water Quality Trend: Stable
Based on 6 years of monitoring (2020–2025).
Water clarity
Improving6 years
Phosphorus
Worsening+8.56 µg/L/yr6 years
EPA Impairment Status
Thonotosas Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Aquatic life, Recreation.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit FL1522B · Official waterbody report
Nearby Lakes in Hillsborough County
Frequently asked questions about Thonotosas Lake
Where is Thonotosas Lake?
- Thonotosas Lake is a lake in Hillsborough County, Florida. Its water-quality measurements are published by Florida DEP and shown on this page as reported.
What is the water quality of Thonotosas Lake?
- Thonotosas Lake in Hillsborough County, Florida has water-quality measurements published by Florida DEP, shown here as reported.
Is Thonotosas Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Thonotosas Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, impaired biota (cause unknown), nutrients (phosphorus, nitrogen). Check local advisories before you swim.
What is the water temperature of Thonotosas Lake?
- Thonotosas Lake typically sits around 82°F at the surface in October, from 8 EPA Water Quality Portal field readings (2012–2024). That is a typical value for the month, not a live reading.
Explore Thonotosas Lake across LakeQuality
More lakes in Florida
Other Lakes in Florida
Where this data comes from
2 measurements from 1 monitoring station, 2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Submitting organization not recorded for these samples2 samples · 2024
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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database