Duval-Willow Lake
Duval County, FloridaEutrophic
Duval-Willow Lake is a productive, nutrient-rich eutrophic lake in Duval County, Florida. Water quality is graded C based on 2 sampling years through 2022. Compared to the 3 other monitored lakes in Duval County, Duval-Willow Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, Florida DNR, last sampled 2022-12-28. Grade methodology: LakeGrade methodology.
Watch Duval-Willow Lake water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Very murky, less than 3 ft of visibility. Phosphorus level: 24 µg/L. Trophic State Index: 56.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3 ft | D |
| Phosphorus | 24 µg/L | B |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 56 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Location
County Ranking
Ranked #2 of 4 lakes in Duval County
Cleaner Lakes Within 30 Miles
Duval-Willow Lake holds Grade C. 2 nearby lakes hold higher grades.
- AClay-Foxvalley LakeClay County · 10.1 mi · Two grade letters higher (C → A)
- BDuval-Hidden LakeDuval County · 8.3 mi · Higher grade (C → B)
Nearby Lakes in Duval County
More Florida Lake Rankings
Other Grade C Lakes in Florida
Orange County · Clarity: 3.5 ft
Walton County · Clarity: 4.2 ft
Seminole County · Clarity: 4.5 ft
Seminole County · Clarity: 2.9 ft
Polk County · Clarity: 3.5 ft
Volusia County · Clarity: 4.5 ft
Eutrophic Lakes in Florida
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.
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: 2022-12-28
Monitoring stations: 3
Where to stay near Duval-Willow Lake
Compare lakeside cabins, hotels, and vacation rentals near Duval-Willow Lake in Duval County, Florida — live availability and prices for your trip.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.