Washington County Lake Quality
Vermont, 17 lakes, average grade A (Excellent)
Washington County's 17 graded lakes fall in the moderate-density bracket for {{stateName}}. The county-level average smooths over real differences — a single agricultural watershed near the southwest corner can pull the average down even if the rest of the county runs clean. The county's average grade is A — among the cleanest in {{stateName}}. 14 lakes pull an A on their own, and almost none fall into the D or F brackets.
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. Valley Lake (A) is the cleanest in the county.
Quick Answers for Washington County
Planning a trip? Check special fishing regulations for Valley Lake — or check the official Vermont fishing regulations.
All Lakes in Washington County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Valley Lake | A | 24.4 ft | 16.7 µg/L |
| 2 | Berlin Pond | A | 21.7 ft | 7.1 µg/L |
| 3 | Nichols Pond | A | 23.3 ft | 8.6 µg/L |
| 4 | Sabin Pond | A | 15.7 ft | 9.6 µg/L |
| 5 | Curtis Pond | A | 15.3 ft | 13.3 µg/L |
| 6 | Lake Mirror | A | 21.3 ft | 10.6 µg/L |
| 7 | Shadow Pond | A | 27.9 ft | 9.4 µg/L |
| 8 | Lake Greenwood | A | 18 ft | 11 µg/L |
| 9 | Forest Lake | A | 25.6 ft | 7 µg/L |
| 10 | Waterbury Reservoir | A | - | 8.9 µg/L |
| 11 | East Long Pond | A | 20.7 ft | 13.7 µg/L |
| 12 | Coits Pond | A | - | 10 µg/L |
| 13 | Cranberry Meadow Pond | A | 11.8 ft | 14.3 µg/L |
| 14 | Kettle Pond | A | 10.2 ft | 12.8 µg/L |
| 15 | Turtlehead Pond | B | 7.7 ft | 13.8 µg/L |
| 16 | Mollys Falls Reservoir | B | 10.8 ft | - |
| 17 | Blueberry Lake | B | 7.9 ft | 11.2 µg/L |
Other Counties in Vermont
See how Washington County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 17 states.
Where to stay near Washington County
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Source: EPA National Aquatic Resource Surveys, 2026.