Hillsborough-Dead Lady Lake
Hillsborough County, FloridaView mapDirections
Florida DEP publishes the water-quality measurements for Hillsborough-Dead Lady Lake. Here is what has been measured.
- Eutrophic
- Impaired · Algal growth
Hillsborough-Dead Lady Lake in Hillsborough County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 5 ft visibility. Phosphorus: 40 µg/L.
Hillsborough-Dead Lady Lake is a productive, nutrient-rich eutrophic lake in Hillsborough County, Florida. Overall water quality is improving over recent sampling years. Compared to the 123 other monitored lakes in Hillsborough County, Hillsborough-Dead Lady Lake ranks #37 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-03-28. Methodology: how these readings are compared.
Swimming conditions
Readings onlyRecreation use not supported
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-Dead Lady Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth. Check local advisories before you swim.
Whether Hillsborough-Dead Lady 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-Dead Lady Lake
These are the measurements Florida DEP publishes for Hillsborough-Dead Lady 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 40 µg/L. TSI 56.
| 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 | 40µg/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. | 56 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Hillsborough-Dead Lady Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Hillsborough-Dead Lady Lake typically sits around 76°F at the surface in October. Summer average is about 83°F. Usually warmest in Aug (about 83°F) and coldest in Mar (about 64°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (64°F) to its warmest (83°F).
Typical surface water temperature by month, from 35 field readings (2011–2017) via the EPA Water Quality Portal. See the full Hillsborough-Dead Lady Lake water temperature breakdown →
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Stays near Hillsborough-Dead Lady Lake
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Fishing Hillsborough-Dead Lady Lake
Water Quality Trend: Improving
Based on 5 years of monitoring (2020–2024).
Water clarity
Improving5 years
Phosphorus
Stable-0.2 µg/L/yr5 years
EPA Impairment Status
Hillsborough-Dead Lady 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.
Source: EPA ATTAINS assessment unit FL1474W · Official waterbody report
Nearby Lakes in Hillsborough County
Frequently asked questions about Hillsborough-Dead Lady Lake
Where is Hillsborough-Dead Lady Lake?
- Hillsborough-Dead Lady 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-Dead Lady Lake?
- Hillsborough-Dead Lady Lake in Hillsborough County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 5 ft visibility. Phosphorus: 40 µg/L.
Is Hillsborough-Dead Lady Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Hillsborough-Dead Lady Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth. Check local advisories before you swim.
What is the water temperature of Hillsborough-Dead Lady Lake?
- Hillsborough-Dead Lady Lake typically sits around 76°F at the surface in October, from 35 EPA Water Quality Portal field readings (2011–2017). That is a typical value for the month, not a live reading.
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Where this data comes from
160 measurements from 3 monitoring stations, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- FLORIDA LAKEWATCH
21FLKWAT_WQX160 samples · 2020–2025
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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database