Duval-Hidden Lake
Duval County, FloridaView mapDirections
Florida DEP publishes the water-quality measurements for Duval-Hidden Lake. Here is what has been measured.
- Mesotrophic
- Public access
Duval-Hidden Lake in Duval County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 7 ft visibility. Phosphorus: 15 µg/L.
Duval-Hidden Lake is a mesotrophic lake in Duval County, Florida. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available. Compared to the 2 other monitored lakes in Duval County, Duval-Hidden Lake ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2024-07-22. 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-Hidden 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-Hidden Lake
These are the measurements Florida DEP publishes for Duval-Hidden Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Moderate clarity, visible to about 7 ft. Phosphorus 15 µg/L. TSI 46.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 7ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 15µg/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. | 46 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Duval-Hidden Lake
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Stays near Duval-Hidden Lake
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Fishing Duval-Hidden Lake
Water Quality Trend: Worsening
Based on 4 years of monitoring (2021–2024).
Water clarity
Stable4 years
Phosphorus
Worsening+0.95 µg/L/yr4 years
Regulated Pollution Sources Nearby
2 EPA-permitted facilities operate within about 5 miles of Duval-Hidden Lake under Clean Water Act (NPDES) discharge permits, including 2 classified by the EPA as major dischargers.
- Jacksonville, City Of - Jea/ San Jose WwtfJacksonville · 3.2 mi away · NPDES FL0023663Major
- Royal Lakes SubdivisionJacksonville · 3.5 mi away · NPDES FL0026751Major
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-Hidden Lake
Where is Duval-Hidden Lake?
- Duval-Hidden 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-Hidden Lake?
- Duval-Hidden Lake in Duval County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 7 ft visibility. Phosphorus: 15 µg/L.
Is Duval-Hidden 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-Hidden Lake?
- Public access to Duval-Hidden 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-Hidden Lake across LakeQuality
Planning a trip around Castillo de San Marcos?
Duval-Hidden Lake is about 30 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
Mesotrophic Lakes in Florida
Where this data comes from
132 measurements from 3 monitoring stations, 2021–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- FLORIDA LAKEWATCH
21FLKWAT_WQX132 samples · 2021–2024
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)