Pinellas-Hewitt Lake
Pinellas-Hewitt Lake in Pinellas County, Florida has a water quality grade of B (Good). Water clarity: 5 ft visibility. Phosphorus: 16 µg/L.
- Clarity
- 5 ft
- Type
- Mesotrophic
- Trend
- → Stable
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Pinellas-Hewitt Lake is a mesotrophic lake in Pinellas County, Florida. Water quality is graded B based on 1 sampling years through 2024. Water clarity is improving over recent sampling years. Compared to the 33 other monitored lakes in Pinellas County, Pinellas-Hewitt Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2024-12-31. Grade methodology: LakeQuality methodology.
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Swimming Safety
Grade onlyBacteria advisory
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)
Murky, only visible to about 5 ft. Phosphorus level: 16 µg/L. Trophic State Index: 49.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5 ft | Not graded |
| Phosphorus | 16 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 49 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Pinellas-Hewitt Lake
Compare lakeside cabins, hotels, and vacation rentals near Pinellas-Hewitt Lake in Pinellas 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.
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Fishing Pinellas-Hewitt Lake
Water Quality Trend: → Stable
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.1 m/yr | 5 |
| Phosphorus | ↓ Declining | +1.15 µg/L/yr | 5 |
EPA Impairment Status
Pinellas-Hewitt Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit FL1668A · Official waterbody report · Matched by proximity (1.07 km)
Regulated Pollution Sources Nearby
2 EPA-permitted facilities operate within about 5 miles of Pinellas-Hewitt Lake under Clean Water Act (NPDES) discharge permits, including 2 classified by the EPA as major dischargers. 2 facilities have a reported Clean Water Act violation in the past three years.
- Kenneth City, Town OfKenneth City · 1.1 mi away · NPDES FLS648451MajorRecent violation
- Pinellas Park, City OfPinellas Park · 2.4 mi away · NPDES FLS648302MajorRecent violation
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
County Ranking
Ranked #1 of 34 lakes in Pinellas County
Nearby Lakes in Pinellas County
Frequently asked questions about Pinellas-Hewitt Lake
Where is Pinellas-Hewitt Lake?
- Pinellas-Hewitt Lake is a lake in Pinellas County, Florida. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Pinellas-Hewitt Lake?
- Pinellas-Hewitt Lake in Pinellas County, Florida has a water quality grade of B (Good). Water clarity: 5 ft visibility. Phosphorus: 16 µg/L.
Is Pinellas-Hewitt Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Pinellas-Hewitt Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
Explore Pinellas-Hewitt Lake across LakeQuality
More Florida Lake Rankings
Other Grade B Lakes in Florida
Hillsborough County · 8 ft
Hillsborough County · 5 ft
Hillsborough County · 4.3 ft
Hillsborough County · 6.2 ft
Hillsborough County · 4.4 ft
Hillsborough County · Good
Mesotrophic Lakes in Florida
Where this data comes from
335 measurements from 3 monitoring stations, 2020–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- FLORIDA LAKEWATCH
21FLKWAT_WQX335 samples · 2020–2024
Monitoring station identifiers (3)
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
Regulated discharger data from EPA ECHO (ICIS-NPDES)