Duval-Willow Lake
Duval-Willow Lake in Duval County, Florida has a water quality grade of B (Good). Water clarity: 3 ft visibility. Phosphorus: 24 µg/L.
- Clarity
- 3 ft
- Type
- Eutrophic
- Trend
- ↑ Improving
- Public access
- Yes
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Duval-Willow Lake is a productive, nutrient-rich eutrophic lake in Duval County, Florida. Water quality is graded B based on 1 sampling years through 2022. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing. 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. Grade methodology: LakeQuality methodology.
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Swimming Safety
Grade onlyLow algae
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Good for swimming, clear water with low algae levels
Water Quality Grade: B (Good)
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 | Not graded |
| Phosphorus | 24 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 56 | Eutrophic |
High nutrients, frequent algae, reduced clarity
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. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Duval-Willow Lake
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Planning a whole trip? See where to stay at Florida’s top lakes →
Recreation & Access
- Hood Landing Public Boat RampPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Duval-Willow Lake
Water Quality Trend: ↑ Improving
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.75 m/yr | 2 |
| Phosphorus | ↑ Improving | -6.5 µg/L/yr | 2 |
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.
County Ranking
Ranked #1 of 3 lakes in Duval County
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. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Duval-Willow Lake?
- Duval-Willow Lake in Duval County, Florida has a water quality grade of B (Good). Water clarity: 3 ft visibility. Phosphorus: 24 µg/L.
Is Duval-Willow Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Duval-Willow Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
Are there boat ramps on Duval-Willow Lake?
- Duval-Willow Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Hood Landing Public Boat Ramp. Public access is listed as yes.
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 Florida Lake Rankings
Other Grade B 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)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Named boat-access points from the USGS National Boat Ramps inventory