Lake Killearny
Lake Killearny in Leon County, Florida has a water quality grade of B (Good). Phosphorus: 33 µg/L.
- Typical in August
- 85°F
- Type
- Eutrophic
- Trend
- → Stable
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Lake Killearny is a productive, nutrient-rich eutrophic lake in Leon County, Florida. Water quality is graded B based on 1 sampling years through 2022. Water clarity is declining over recent sampling years. Compared to the 58 other monitored lakes in Leon County, Lake Killearny ranks #40 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2022-12-07. Grade methodology: LakeQuality methodology.
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Swimming Safety
Grade onlyLimited data
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Good for swimming, clear water with low algae levels
Water Quality Grade: B (Good)
No clarity data. Phosphorus level: 33 µg/L. Trophic State Index: 55.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 33 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 55 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Lake Killearny
Compare lakeside cabins, hotels, and vacation rentals near Lake Killearny in Leon 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 Lake Killearny
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Planning a whole trip? See where to stay at Florida’s top lakes →
Water Temperature
Lake Killearny typically sits around 85°F at the surface in August. Summer average is about 85°F. Usually warmest in Jun (about 85°F) and coldest in Feb (about 62°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 62 field readings (2011–2022) via the EPA Water Quality Portal. See the full Lake Killearny water temperature breakdown →
Fishing Lake Killearny
Water Quality Trend: → Stable
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.065 m/yr | 3 |
| Phosphorus | ↑ Improving | -5.13 µg/L/yr | 6 |
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
Source: EPA ATTAINS assessment unit FL647J · Official waterbody report · Matched by proximity (0.52 km)
County Ranking
Ranked #40 of 59 lakes in Leon County
Nearby Lakes in Leon County
Frequently asked questions about Lake Killearny
Where is Lake Killearny?
- Lake Killearny is a lake in Leon County, Florida. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Lake Killearny?
- Lake Killearny in Leon County, Florida has a water quality grade of B (Good). Phosphorus: 33 µg/L.
Is Lake Killearny safe to swim in?
- Good for swimming, clear water with low algae levels. Lake Killearny has a water quality grade of B (Good). Always check local health department advisories before swimming.
What is the water temperature of Lake Killearny?
- Lake Killearny typically sits around 85°F at the surface in August, from 62 EPA Water Quality Portal field readings (2011–2022). That is a typical value for the month, not a live reading.
Explore Lake Killearny across LakeQuality
More Florida Lake Rankings
Other Grade B Lakes in Florida
Eutrophic Lakes in Florida
Where this data comes from
12 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 samples12 samples · 2020–2022
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database