Duval-Willow Lake
Duval County, FloridaView mapDirections
Florida DEP publishes the water-quality measurements for Duval-Willow Lake. Here is what has been measured.
- Eutrophic
- Public access
Duval-Willow Lake in Duval County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 3 ft visibility. Phosphorus: 24 µg/L.
Duval-Willow Lake is a productive, nutrient-rich eutrophic lake in Duval County, Florida. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available. Compared to the 2 other monitored lakes in Duval County, Duval-Willow Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2022-12-28. 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 Duval-Willow 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 Duval-Willow Lake
These are the measurements Florida DEP publishes for Duval-Willow 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 ft of visibility. Phosphorus 24 µg/L. TSI 56.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 3ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 24µg/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. | 56 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Duval-Willow Lake
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Stays near Duval-Willow Lake
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Fishing Duval-Willow Lake
Water quality readings over time
2 seasons of samples on record (2020–2022). Calling a direction takes at least 4 years of the same measurement.
Water clarity
Improving2 years
Phosphorus
Improving-6.5 µg/L/yr2 years
Regulated Pollution Sources Nearby
5 EPA-permitted facilities operate within about 5 miles of Duval-Willow Lake under Clean Water Act (NPDES) discharge permits, including 1 classified by the EPA as major discharger. 3 facilities have a reported Clean Water Act violation in the past three years.
- Mandarin WrfJacksonville · 3.9 mi away · NPDES FL0023493MajorRecent violation
- Julington Creek WrfFruit Cove · 4.1 mi away · NPDES FL0043591Recent violation
- Blacks Ford WrfJacksonville · 4.5 mi away · NPDES FL0174441Recent violation
- Jea Greenland WwtfJacksonville · 4.3 mi away · NPDES FL0A00023
- Cypress Landing WwtfJacksonville · 4.5 mi away · NPDES FL0043842
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 Duval County
Frequently asked questions about Duval-Willow Lake
Where is Duval-Willow Lake?
- Duval-Willow Lake is a lake in Duval County, Florida. Its water-quality measurements are published by Florida DEP and shown on this page as reported.
What is the water quality of Duval-Willow Lake?
- Duval-Willow Lake in Duval County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 3 ft visibility. Phosphorus: 24 µg/L.
Is Duval-Willow Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Can I fish at Duval-Willow Lake?
- Public access to Duval-Willow Lake is listed as yes on the lake record. Seasons, size and bag limits, and whether you need a license are set by Florida's fish and wildlife agency, so check its current regulations before you go.
Explore Duval-Willow Lake across LakeQuality
Planning a trip around Castillo de San Marcos?
Duval-Willow Lake is about 23 miles from Castillo de San Marcos National Monument. Crowds there swing hard by season, so the month you pick changes both how busy the park is and what lodging costs.
Best time to visit Castillo de San Marcos →More lakes in Florida
Other Lakes in Florida
Eutrophic Lakes in Florida
Where this data comes from
89 measurements from 3 monitoring stations, 2020–2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- FLORIDA LAKEWATCH
21FLKWAT_WQX89 samples · 2020–2022
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)