Pinellas-Autu Lake
Pinellas County, FloridaView mapDirections
Florida DEP publishes the water-quality measurements for Pinellas-Autu Lake. Here is what has been measured.
- Eutrophic
Pinellas-Autu Lake in Pinellas County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 2.8 ft visibility. Phosphorus: 49 µg/L.
Pinellas-Autu Lake is a productive, nutrient-rich eutrophic lake in Pinellas County, Florida. Overall water quality is improving over recent sampling years. Compared to the 33 other monitored lakes in Pinellas County, Pinellas-Autu Lake ranks #12 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-02-16. 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. Check local advisories before you swim.
Whether Pinellas-Autu 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 Pinellas-Autu Lake
These are the measurements Florida DEP publishes for Pinellas-Autu 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 2.8 ft of visibility. Phosphorus 49 µg/L. TSI 61.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 2.8ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 49µg/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. | 61 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
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Fishing Pinellas-Autu Lake
Water Quality Trend: Improving
Based on 5 years of monitoring (2020–2024).
Water clarity
Improving5 years
Phosphorus
Improving-87.1 µg/L/yr5 years
Nearby Lakes in Pinellas County
Frequently asked questions about Pinellas-Autu Lake
Where is Pinellas-Autu Lake?
- Pinellas-Autu Lake is a lake in Pinellas County, Florida. Its water-quality measurements are published by Florida DEP and shown on this page as reported.
What is the water quality of Pinellas-Autu Lake?
- Pinellas-Autu Lake in Pinellas County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 2.8 ft visibility. Phosphorus: 49 µg/L.
Is Pinellas-Autu Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Explore Pinellas-Autu Lake across LakeQuality
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Where this data comes from
76 measurements from 2 monitoring stations, 2023–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- FLORIDA LAKEWATCH
21FLKWAT_WQX76 samples · 2023–2025
Monitoring station identifiers (2)
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.