Washington County Lake Quality
Florida, 11 lakes, average grade B (Good)
Only 11 lakes in Washington County carry an active grade. The county-level summary is therefore representative of those specific lakes, not necessarily of every water body in the county. The county-wide average lands at B — solid water quality with most lakes carrying clear summer transparency and low-to-moderate phosphorus.
Most of the county's monitored lakes are shallow — under 50 feet — which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed. Mlc Lake (B) is the cleanest in the county.
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Quick Answers for Washington County
Planning a trip? Check special fishing regulations for Mlc Lake — or check the official Florida fishing regulations.
All Lakes in Washington County
11 lakes · 3 graded, 8 not rated3 graded lakes · 8 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | BMlc LakeWashington | B | 14.1 ft | 6 µg/L | No recent samples | No recent samples | Not recorded |
| 2 | BDunl LakeWashington | B | 14.8 ft | 4 µg/L | No recent samples | No recent samples | Not recorded |
| 3 | BClc LakeWashington | B | 16.4 ft | 4.5 µg/L | No recent samples | No recent samples | ✓ Public |
| NRSmith Pond CenterWashington | NR | 2.3 ft | 12 µg/L | No recent samples | No recent samples | Not recorded | |
| NRGap LakeWashington | NR | 13.8 ft | 4 µg/L | No recent samples | No recent samples | ✓ Public | |
| NRBoat LakeWashington | NR | 4.9 ft | 5 µg/L | No recent samples | No recent samples | Not recorded | |
| NROpen LakeWashington | NR | 24.3 ft | 4 µg/L | No recent samples | No recent samples | Not recorded | |
| NRDeadenings LakeWashington | NR | 3.6 ft | 6 µg/L | No recent samples | No recent samples | Not recorded | |
| NRPorterref LakeWashington | NR | 6.6 ft | 9 µg/L | No recent samples | No recent samples | ✓ Public | |
| NRDunfordref LakeWashington | NR | 11.5 ft | 5 µg/L | No recent samples | No recent samples | Not recorded | |
| NRRsnakeref LakeWashington | NR | 9.5 ft | 6 µg/L | No recent samples | No recent samples | Not recorded |
NR = not rated: there is not enough recent sampling to support a letter. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.
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Other Counties in Florida
See how Washington County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 49 states and 2 Canadian provinces.
Source: EPA National Aquatic Resource Surveys, 2026.