Duval-Hidden Lake
Duval County, FloridaMesotrophic
Duval-Hidden Lake is a mesotrophic lake in Duval County, Florida. Water quality is graded B based on 2 sampling years through 2024. Compared to the 3 other monitored lakes in Duval County, Duval-Hidden Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Florida DNR, last sampled 2024-07-22. Grade methodology: LakeGrade methodology.
Watch Duval-Hidden Lake water quality
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Moderate clarity, visible to about 7 ft. Phosphorus level: 15 µg/L. Trophic State Index: 46.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 7 ft | C |
| Phosphorus | 15 µg/L | B |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 46 | Mesotrophic |
Moderate nutrients, good water quality
Location
County Ranking
Ranked #1 of 4 lakes in Duval County
Cleaner Lakes Within 30 Miles
Duval-Hidden Lake holds Grade B. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Duval County
More Florida Lake Rankings
Other Grade B Lakes in Florida
Bay County · Clarity: 4 ft
Brevard County · Clarity: 9.8 ft
Alachua County · Clarity: 5.5 ft
Seminole County · Clarity: 5 ft
Marion County · Clarity: 7 ft
Hillsborough County · Clarity: 6 ft
Mesotrophic Lakes in Florida
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.
Data Sources
Water quality data from the EPA Water Quality Portal
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2024-07-22
Monitoring stations: 3
Where to stay near Duval-Hidden Lake
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