Hillsborough-Harvey Lake
Hillsborough County, FloridaView mapDirections
Florida DEP publishes the water-quality measurements for Hillsborough-Harvey Lake. Here is what has been measured.
- Mesotrophic
- Impaired · Impaired biota (cause unknown)
- Limited data
Hillsborough-Harvey Lake in Hillsborough County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 5 ft visibility. Phosphorus: 8 µg/L.
Hillsborough-Harvey Lake is a mesotrophic lake in Hillsborough County, Florida. Overall water quality is declining over recent sampling years. Compared to the 123 other monitored lakes in Hillsborough County, Hillsborough-Harvey Lake ranks #20 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2022-05-11. 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. Hillsborough-Harvey Lake is listed impaired under Clean Water Act §303(d) (IR 5) for impaired biota (cause unknown). Check local advisories before you swim.
Whether Hillsborough-Harvey 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-Harvey Lake
These are the measurements Florida DEP publishes for Hillsborough-Harvey 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 5 ft. Phosphorus 8 µg/L. TSI 44.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 5ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 8µg/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. | 44 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Hillsborough-Harvey Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Hillsborough-Harvey Lake typically sits around 83°F at the surface in August. Summer average is about 85°F. Usually warmest in Jun (about 86°F) and coldest in Mar (about 74°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (74°F) to its warmest (86°F).
Typical surface water temperature by month, from 10 field readings (2015–2015) via the EPA Water Quality Portal. See the full Hillsborough-Harvey Lake water temperature breakdown →
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Fishing Hillsborough-Harvey Lake
Water Quality Trend: Worsening
Based on 6 years of monitoring (2020–2025).
Water clarity
Worsening6 years
Phosphorus
Stable+0.3 µg/L/yr5 years
EPA Impairment Status
Hillsborough-Harvey 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.
Source: EPA ATTAINS assessment unit FL1463D · Official waterbody report
Nearby Lakes in Hillsborough County
Frequently asked questions about Hillsborough-Harvey Lake
Where is Hillsborough-Harvey Lake?
- Hillsborough-Harvey 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-Harvey Lake?
- Hillsborough-Harvey Lake in Hillsborough County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 5 ft visibility. Phosphorus: 8 µg/L.
Is Hillsborough-Harvey Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Hillsborough-Harvey Lake is listed impaired under Clean Water Act §303(d) (IR 5) for impaired biota (cause unknown). Check local advisories before you swim.
What is the water temperature of Hillsborough-Harvey Lake?
- Hillsborough-Harvey Lake typically sits around 83°F at the surface in August, from 10 EPA Water Quality Portal field readings (2015–2015). That is a typical value for the month, not a live reading.
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Where this data comes from
18 measurements from 3 monitoring stations, 2020–2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- FLORIDA LAKEWATCH
21FLKWAT_WQX18 samples · 2020–2022
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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database