Dunl Lake
Dunl Lake in Washington County, Florida has a water quality grade of B (Good). Water clarity: 14.8 ft visibility. Phosphorus: 4 µg/L.
- Clarity
- 14.8 ft
- Typical in August
- 87°F
- Type
- Oligotrophic
- Trend
- ↓ Declining
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Dunl Lake is a cold, clear oligotrophic lake in Washington County, Florida. Water quality is graded B based on 1 sampling years through 2020. 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. Grade methodology: LakeQuality methodology.
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Swimming Safety
Grade onlyLimited data
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)
Good clarity, visible to about 14.8 ft. Phosphorus level: 4 µg/L. Trophic State Index: 31.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 14.8 ft | Not graded |
| Phosphorus | 4 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 31 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay 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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Water Temperature
Dunl Lake typically sits around 87°F at the surface in August. 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.
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 →
Fishing Dunl Lake
Water Quality Trend: ↓ Declining
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -1 m/yr | 2 |
| Phosphorus | ↓ Declining | +1 µg/L/yr | 2 |
County Ranking
Ranked #3 of 4 lakes in Washington County
Nearby Lakes in Washington County
Frequently asked questions about Dunl Lake
Where is Dunl Lake?
- Dunl Lake is a lake in Washington County, Florida. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Dunl Lake?
- Dunl Lake in Washington County, Florida has a water quality grade of B (Good). Water clarity: 14.8 ft visibility. Phosphorus: 4 µg/L.
Is Dunl Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Dunl Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
What is the water temperature of Dunl Lake?
- Dunl Lake typically sits around 87°F at the surface in August, 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
More Florida Lake Rankings
Other Grade B Lakes in Florida
Oligotrophic Lakes in Florida
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)
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.