Harbor Isles Lake
Pinellas County, FloridaEutrophic
Harbor Isles Lake is a productive, nutrient-rich eutrophic lake in Pinellas County, Florida. Water quality is graded D based on 2 sampling years through 2022. Compared to the 54 other monitored lakes in Pinellas County, Harbor Isles Lake ranks #28 for water quality.
Source: EPA Water Quality Portal sampling records, Florida DNR, last sampled 2022-10-05. Grade methodology: LakeGrade methodology.
Watch Harbor Isles 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 1.6 ft of visibility. Phosphorus level: 95 µg/L. Trophic State Index: 70.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.6 ft | F |
| Phosphorus | 95 µg/L | D |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 70 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Location
County Ranking
Ranked #28 of 55 lakes in Pinellas County
Cleaner Lakes Within 30 Miles
Harbor Isles Lake holds Grade D. 2 nearby lakes hold higher grades.
- BPinellas-Hewitt LakePinellas County · 6 mi · Two grade letters higher (D → B)
- DPinellas-Crescent LakePinellas County · 3.8 mi · Higher overall water quality score
Nearby Lakes in Pinellas County
More Florida Lake Rankings
Other Grade D Lakes in Florida
Eutrophic Lakes in Florida
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Data Sources
Water quality data from the EPA Water Quality Portal
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2022-10-05
Monitoring stations: 4
Where to stay near Harbor Isles Lake
Compare lakeside cabins, hotels, and vacation rentals near Harbor Isles 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.