Windham County Lake Quality
Vermont, 25 lakes, average grade A (Excellent)
There are 25 monitored lakes in Windham County. The mix is varied enough that the county-level average tells you the broad strokes, not the choose-this-cabin specifics. 9 of those lakes carry an A–F grade. The county-level summary describes that subset, not every water body listed. On average, Windham County lakes grade an A. That puts it near the top of the Vermont county ranking.
The county's lakes lean shallow, which makes the grades sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest lake on the books is Lake Raponda (A); the most-stressed is Grout Pond (B).
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Quick Answers for Windham County
Planning a trip? Check special fishing regulations for Lake Raponda — or check the official Vermont fishing regulations.
All Lakes in Windham County
25 lakes · 9 graded, 16 not rated9 graded lakes · 16 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | ALake RapondaWindham | A | 11.3 ft | 10.1 µg/L | 2.4 µg/L | No recent samples | Not recorded |
| 2 | ALowell LakeWindham | A | 13.5 ft | 8.2 µg/L | 1.8 µg/L | No recent samples | Not recorded |
| 3 | ASouth PondWindham | A | 14.8 ft | 13.1 µg/L | 2.9 µg/L | No recent samples | ✓ Public |
| 4 | AStratton PondWindham | A | 8.2 ft | 11.1 µg/L | 3.3 µg/L | No recent samples | Not recorded |
| 5 | ACole PondWindham | A | 9.8 ft | 9.9 µg/L | 2.2 µg/L | No recent samples | Not recorded |
| 6 | BGrout PondWindham | B | 8.5 ft | 12.5 µg/L | 2.9 µg/L | No recent samples | Not recorded |
| 7 | BSunset LakeWindham | B | 17.9 ft | 10.1 µg/L | 1.8 µg/L | No recent samples | Not recorded |
| 8 | BHaystack PondWindham | B | 9.6 ft | 10.2 µg/L | No recent samples | No recent samples | Not recorded |
| 9 | BForester PondWindham | B | 5.9 ft | 10 µg/L | No recent samples | No recent samples | Not recorded |
| NRHarriman ReservoirWindham | NR | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRSomerset ReservoirWindham | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRGrout Pond OutletWindham | NR | No recent samples | 7.8 µg/L | No recent samples | No recent samples | Not recorded | |
| NRBinney Brook LakeWindham | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRSweet PondWindham | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRLily PondWindham | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRLily PondWindham | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRKenny PondWindham | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRWeatherhead Hollow LakeWindham | NR | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRPine LakeWindham | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRSadawga LakeWindham | NR | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRGates PondWindham | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRBurbees PondWindham | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRStratton PondWindham | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRSherman ReservoirWindham | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRMinards PondWindham | NR | No recent samples | No recent samples | 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.
Lake Match
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Other Counties in Vermont
See how Windham County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all United States (49 states), Canada (Ontario, Québec, Nova Scotia, British Columbia and Newfoundland and Labrador), and 38 other country hubs..
Source: EPA National Aquatic Resource Surveys, 2026.