Pinellas-Autu Lake
Pinellas County, FloridaEutrophic
Pinellas-Autu Lake is a productive, nutrient-rich eutrophic lake in Pinellas County, Florida. Water quality is graded D based on 2 sampling years through 2025. Compared to the 54 other monitored lakes in Pinellas County, Pinellas-Autu Lake ranks #22 for water quality.
Source: EPA Water Quality Portal sampling records, Florida DNR, last sampled 2025-02-16. Grade methodology: LakeGrade methodology.
Watch Pinellas-Autu Lake water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Very murky, less than 2.8 ft of visibility. Phosphorus level: 49 µg/L. Trophic State Index: 61.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.8 ft | F |
| Phosphorus | 49 µg/L | C |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 61 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Location
County Ranking
Ranked #22 of 55 lakes in Pinellas County
Cleaner Lakes Within 30 Miles
Pinellas-Autu Lake holds Grade D. 2 nearby lakes hold higher grades.
- CPinellas-Meadow West LakePinellas County · 0.4 mi · Higher grade (D → C)
- CPinellas-Tarpon LakePinellas County · 2.6 mi · Higher grade (D → C)
Nearby Lakes in Pinellas County
More Florida Lake Rankings
Other Grade D Lakes in Florida
Eutrophic Lakes in Florida
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2025-02-16
Monitoring stations: 2
Where to stay near Pinellas-Autu Lake
Compare lakeside cabins, hotels, and vacation rentals near Pinellas-Autu Lake in Pinellas County, Florida — live availability and prices for your trip.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.