Hillsborough-Long Pond
Hillsborough County, FloridaView mapDirections
Florida DEP publishes the water-quality measurements for Hillsborough-Long Pond. Here is what has been measured.
- Eutrophic
- Impaired · Impaired biota (cause unknown)
- 54 ft max depth
Hillsborough-Long Pond in Hillsborough County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 2 ft visibility. Phosphorus: 50.5 µg/L.
Hillsborough-Long Pond is a productive, nutrient-rich eutrophic lake in Hillsborough County, Florida with an estimated average depth of about 54 feet. Water clarity is improving over recent sampling years. Compared to the 123 other monitored lakes in Hillsborough County, Hillsborough-Long Pond ranks #81 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-02-15. Methodology: how these readings are compared.
Swimming conditions
Readings onlyModerate 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. Hillsborough-Long Pond is listed impaired under Clean Water Act §303(d) (IR 5) for impaired biota (cause unknown). Check local advisories before you swim.
Whether Hillsborough-Long Pond 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-Long Pond
These are the measurements Florida DEP publishes for Hillsborough-Long Pond, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Very murky, less than 2 ft of visibility. Phosphorus 50.5 µg/L. TSI 64.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 2ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 50.5µg/L | Fair 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. | 64 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Hillsborough-Long Pond
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Hillsborough-Long Pond typically sits around 84°F at the surface in September. Summer average is about 87°F. Usually warmest in Aug (about 88°F) and coldest in Feb (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 32 field readings (2010–2019) via the EPA Water Quality Portal. See the full Hillsborough-Long Pond water temperature breakdown →
Lake Details
Max depth
~54 ft est.
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Florida has not published bathymetry for Hillsborough-Long Pond.
Lake Size & Watershed
Watershed (drainage) area
0 sq mi
HydroLAKES / HydroSHEDS
Surface area
49 acres
HydroLAKES / HydroSHEDS
Shoreline
1.4 mi
HydroLAKES / HydroSHEDS
Elevation
62 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
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Fishing Hillsborough-Long Pond
Water Quality Trend: Stable
Based on 6 years of monitoring (2020–2025).
Water clarity
Improving3 years
Phosphorus
Worsening+8.69 µg/L/yr6 years
EPA Impairment Status
Hillsborough-Long Pond 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 FL1547B · Official waterbody report
Nearby Lakes in Hillsborough County
Frequently asked questions about Hillsborough-Long Pond
Where is Hillsborough-Long Pond?
- Hillsborough-Long Pond 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-Long Pond?
- Hillsborough-Long Pond in Hillsborough County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 2 ft visibility. Phosphorus: 50.5 µg/L.
Is Hillsborough-Long Pond safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Hillsborough-Long Pond 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-Long Pond?
- Hillsborough-Long Pond typically sits around 84°F at the surface in September, from 32 EPA Water Quality Portal field readings (2010–2019). That is a typical value for the month, not a live reading.
How deep is Hillsborough-Long Pond?
- No published bathymetric survey covers Hillsborough-Long Pond, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 54 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
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Where this data comes from
194 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_WQX194 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
Lake size & watershed from HydroLAKES (HydroSHEDS)