Collier-Islandwalk Lake
Collier County, FloridaView mapDirections
Florida DEP publishes the water-quality measurements for Collier-Islandwalk Lake. Here is what has been measured.
- Eutrophic
Collier-Islandwalk Lake in Collier County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 3.3 ft visibility. Phosphorus: 44.5 µg/L.
Collier-Islandwalk Lake is a productive, nutrient-rich eutrophic lake in Collier County, Florida. Overall water quality is improving over recent sampling years. Compared to the 16 other monitored lakes in Collier County, Collier-Islandwalk Lake ranks #13 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-03-07. 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 Collier-Islandwalk 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 Collier-Islandwalk Lake
These are the measurements Florida DEP publishes for Collier-Islandwalk 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 3.3 ft of visibility. Phosphorus 44.5 µg/L. TSI 59.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 3.3ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 44.5µg/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. | 59 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
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Fishing Collier-Islandwalk Lake
Water Quality Trend: Improving
Based on 4 years of monitoring (2021–2024).
Water clarity
Stable4 years
Phosphorus
Improving-8 µg/L/yr4 years
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Collier-Islandwalk Lake under Clean Water Act (NPDES) discharge permits, including 1 classified by the EPA as major discharger.
- San Carlos Estates Water Control DistrictFort Myers · 3.3 mi away · NPDES FLS266981Major
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 Collier County
Frequently asked questions about Collier-Islandwalk Lake
Where is Collier-Islandwalk Lake?
- Collier-Islandwalk Lake is a lake in Collier County, Florida. Its water-quality measurements are published by Florida DEP and shown on this page as reported.
What is the water quality of Collier-Islandwalk Lake?
- Collier-Islandwalk Lake in Collier County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 3.3 ft visibility. Phosphorus: 44.5 µg/L.
Is Collier-Islandwalk Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
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Where this data comes from
386 measurements from 8 monitoring stations, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- FLORIDA LAKEWATCH
21FLKWAT_WQX386 samples · 2020–2025
Monitoring station identifiers (8)
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)