Dunl Lake
Washington County, FloridaView mapDirections
Florida DEP publishes the water-quality measurements for Dunl Lake. Here is what has been measured.
- Oligotrophic
- Limited data
Dunl Lake in Washington County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 14.8 ft visibility. Phosphorus: 4 µg/L.
Dunl Lake is a cold, clear oligotrophic lake in Washington County, Florida. Overall water quality is declining over recent sampling years. Compared to the 3 other monitored lakes in Washington County, Dunl Lake ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2020-08-04. Methodology: how these readings are compared.
What Dunl Lake is good for
From access and monitoring records, not editorial picks.
- Clear water14.8 ft of visibility
Swimming conditions
Readings onlyLimited data
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 Dunl 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 Dunl Lake
These are the measurements Florida DEP publishes for Dunl Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Good clarity, visible to about 14.8 ft. Phosphorus 4 µg/L. TSI 31.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 14.8ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 4µg/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. | 31 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Dunl Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Dunl Lake typically sits around 79°F at the surface in October. Summer average is about 84°F. Usually warmest in Aug (about 87°F) and coldest in Jan (about 62°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (62°F) to its warmest (87°F).
Typical surface water temperature by month, from 20 field readings (2019–2020) via the EPA Water Quality Portal. See the full Dunl Lake water temperature breakdown →
Stays via Stay22
Stays near Dunl Lake
Compare lakeside cabins, hotels, and vacation rentals near Dunl Lake in Washington 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 Dunl Lake
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Fishing Dunl Lake
Water quality readings over time
2 seasons of samples on record (2020–2021). Calling a direction takes at least 4 years of the same measurement.
Water clarity
Worsening2 years
Phosphorus
Worsening+1 µg/L/yr2 years
Nearby Lakes in Washington County
Frequently asked questions about Dunl Lake
Where is Dunl Lake?
- Dunl Lake is a lake in Washington County, Florida. Its water-quality measurements are published by Florida DEP and shown on this page as reported.
What is the water quality of Dunl Lake?
- Dunl Lake in Washington County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 14.8 ft visibility. Phosphorus: 4 µg/L.
Is Dunl Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
What is the water temperature of Dunl Lake?
- Dunl Lake typically sits around 79°F at the surface in October, from 20 EPA Water Quality Portal field readings (2019–2020). That is a typical value for the month, not a live reading.
Explore Dunl Lake across LakeQuality
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Where this data comes from
8 measurements from 1 monitoring station, 2020. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Submitting organization not recorded for these samples8 samples · 2020
Monitoring station identifiers (1)
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.