Hillsborough-Round Lake
Hillsborough County, FloridaView mapDirections
Florida DEP publishes the water-quality measurements for Hillsborough-Round Lake. Here is what has been measured.
- Mesotrophic
Hillsborough-Round Lake in Hillsborough County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 10 ft visibility. Phosphorus: 10.5 µg/L.
Hillsborough-Round Lake is a mesotrophic lake in Hillsborough County, Florida. Water clarity is improving over recent sampling years. Compared to the 123 other monitored lakes in Hillsborough County, Hillsborough-Round Lake ranks #69 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-04-25. Methodology: how these readings are compared.
What Hillsborough-Round Lake is good for
From access and monitoring records, not editorial picks.
- Clear water10 ft of visibility
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 Hillsborough-Round 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 Hillsborough-Round Lake
These are the measurements Florida DEP publishes for Hillsborough-Round Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Good clarity, visible to about 10 ft. Phosphorus 10.5 µg/L. TSI 41.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 10ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 10.5µg/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. | 41 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Hillsborough-Round Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Hillsborough-Round Lake typically sits around 74°F at the surface in October. Summer average is about 87°F. Usually warmest in Aug (about 87°F) and coldest in Feb (about 67°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (67°F) to its warmest (87°F).
Typical surface water temperature by month, from 17 field readings (2011–2017) via the EPA Water Quality Portal. See the full Hillsborough-Round Lake water temperature breakdown →
Stays via Stay22
Stays near Hillsborough-Round Lake
Compare lakeside cabins, hotels, and vacation rentals near Hillsborough-Round 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 Hillsborough-Round Lake
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Fishing Hillsborough-Round Lake
Water Quality Trend: Stable
Based on 5 years of monitoring (2020–2024).
Water clarity
Improving5 years
Phosphorus
Worsening+0.95 µg/L/yr5 years
Nearby Lakes in Hillsborough County
Frequently asked questions about Hillsborough-Round Lake
Where is Hillsborough-Round Lake?
- Hillsborough-Round 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 Hillsborough-Round Lake?
- Hillsborough-Round Lake in Hillsborough County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 10 ft visibility. Phosphorus: 10.5 µg/L.
Is Hillsborough-Round 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 Hillsborough-Round Lake?
- Hillsborough-Round Lake typically sits around 74°F at the surface in October, from 17 EPA Water Quality Portal field readings (2011–2017). That is a typical value for the month, not a live reading.
Explore Hillsborough-Round Lake across LakeQuality
More lakes in Florida
Other Lakes in Florida
Mesotrophic Lakes in Florida
Where this data comes from
129 measurements from 3 monitoring stations, 2022–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- FLORIDA LAKEWATCH
21FLKWAT_WQX129 samples · 2022–2025
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.