Petty Gulf Lake
Leon County, Florida25 acresView mapDirections
Florida DEP publishes the water-quality measurements for Petty Gulf Lake. Here is what has been measured.
- Impaired · Algal growth
- Limited data
Petty Gulf Lake in Leon County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 1 ft visibility. Phosphorus: 32.5 µg/L. Surface area: 25 acres.
Petty Gulf Lake is a 25-acre lake in Leon County, Florida. Overall water quality is declining over recent sampling years.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2024-10-31. Methodology: how these readings are compared.
Swimming conditions
No readingRecreation use not supported
Nutrient and algae readings are not a swimming clearance. Petty Gulf Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, impaired biota (cause unknown), nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Whether Petty Gulf 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 Petty Gulf Lake
These are the measurements Florida DEP publishes for Petty Gulf Lake, 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 1 ft of visibility. Phosphorus 32.5 µg/L. TSI 66.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 1ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 32.5µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| 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. | 66 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Petty Gulf Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
25 acres
No bathymetric survey has been published for Petty Gulf Lake, so its depth is not documented here.
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Fishing Petty Gulf Lake
Water Quality Trend: Worsening
Based on 6 years of monitoring (2020–2025).
Water clarity
Worsening6 years
Phosphorus
Worsening+1 µg/L/yr6 years
Reservoir Info (USACE NID)
Petty Gulf Lake is a man-made reservoir impounded by the Petty Gulf Lake Dam (completed 1972), built primarily for recreation on the Tr-Lake Iamonia; earth-type dam, 25 ft tall and 1,440 ft long.
- Surface area
- 25 ac
- Normal storage
- 203 ac-ft
- Max storage
- 233 ac-ft
- Drainage area
- 0 sq mi
- Hazard class
- Low
- Owner
- KILLEARN LAKES PLANTATION HOME OWNERS ASSOCIATION
All listed purposes: Recreation;Fire Protection, Stock, Or Small Fish Pond.
Source: USACE National Inventory of Dams, NID ID FL00117 · Operator website
EPA Impairment Status
Petty Gulf 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 FL564C · Official waterbody report
Nearby Lakes in Leon County
Frequently asked questions about Petty Gulf Lake
Where is Petty Gulf Lake?
- Petty Gulf Lake 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 Petty Gulf Lake?
- Petty Gulf Lake in Leon County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 1 ft visibility. Phosphorus: 32.5 µg/L. Surface area: 25 acres.
Is Petty Gulf Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Petty Gulf Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, impaired biota (cause unknown), nutrients (phosphorus, nitrogen). Check local advisories before you swim.
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Where this data comes from
10 measurements from 1 monitoring station, 2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Submitting organization not recorded for these samples10 samples · 2024
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