Pinellas-Hewitt Lake
Pinellas County, FloridaView mapDirections
Florida DEP publishes the water-quality measurements for Pinellas-Hewitt Lake. Here is what has been measured.
- Mesotrophic
Pinellas-Hewitt Lake in Pinellas County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 5 ft visibility. Phosphorus: 16 µg/L.
Pinellas-Hewitt Lake is a mesotrophic lake in Pinellas County, Florida. 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. Methodology: how these readings are compared.
Swimming conditions
Readings onlyLow 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-Hewitt 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-Hewitt Lake
These are the measurements Florida DEP publishes for Pinellas-Hewitt Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Murky, only visible to about 5 ft. Phosphorus 16 µg/L. TSI 49.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 5ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 16µg/L | Good 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. | 49 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
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Fishing Pinellas-Hewitt Lake
Water Quality Trend: Stable
Based on 5 years of monitoring (2020–2024).
Water clarity
Improving5 years
Phosphorus
Worsening+1.15 µg/L/yr5 years
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.
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. Its water-quality measurements are published by Florida DEP and shown on this page as reported.
What is the water quality of Pinellas-Hewitt Lake?
- Pinellas-Hewitt Lake in Pinellas County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 5 ft visibility. Phosphorus: 16 µg/L.
Is Pinellas-Hewitt Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Explore Pinellas-Hewitt Lake across LakeQuality
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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)
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
Regulated discharger data from EPA ECHO (ICIS-NPDES)