Lake Killearny
Leon County, FloridaView mapDirections
Florida DEP publishes the water-quality measurements for Lake Killearny. Here is what has been measured.
- Eutrophic
- Impaired · Algal growth
- Limited data
Lake Killearny in Leon County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Phosphorus: 35 µg/L.
Lake Killearny is a productive, nutrient-rich eutrophic lake in Leon County, Florida. Water clarity is declining over recent sampling years. Compared to the 58 other monitored lakes in Leon County, Lake Killearny ranks #30 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2022-05-21. 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. Lake Killearny is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Whether Lake Killearny 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 Lake Killearny
These are the measurements Florida DEP publishes for Lake Killearny, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. Phosphorus 35 µg/L. TSI 55.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | 35µg/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. | 55 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Lake Killearny
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Lake Killearny typically sits around 74°F at the surface in October. Summer average is about 85°F. Usually warmest in Jun (about 85°F) and coldest in Dec (about 62°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (62°F) to its warmest (85°F).
Typical surface water temperature by month, from 42 field readings (2011–2022) via the EPA Water Quality Portal.
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Stays near Lake Killearny
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Fishing Lake Killearny
Water Quality Trend: Stable
Based on 6 years of monitoring (2020–2025).
Water clarity
Worsening3 years
Phosphorus
Improving-4.88 µg/L/yr6 years
EPA Impairment Status
Lake Killearny 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 FL647J · Official waterbody report
Nearby Lakes in Leon County
Frequently asked questions about Lake Killearny
Where is Lake Killearny?
- Lake Killearny is a lake in Leon County, Florida. Its water-quality measurements are published by Florida DEP and shown on this page as reported.
What is the water quality of Lake Killearny?
- Lake Killearny in Leon County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Phosphorus: 35 µg/L.
Is Lake Killearny safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Lake Killearny is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, nutrients (phosphorus, nitrogen). Check local advisories before you swim.
What is the water temperature of Lake Killearny?
- Lake Killearny typically sits around 74°F at the surface in October, from 42 EPA Water Quality Portal field readings (2011–2022). That is a typical value for the month, not a live reading.
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Where this data comes from
8 measurements from 1 monitoring station, 2020–2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Submitting organization not recorded for these samples8 samples · 2020–2022
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