Addison County Lake Quality
Vermont, 14 lakes, average grade B (Good)
Addison County holds 14 monitored lakes. With a sample that small the county-level summary describes those specific waters, not necessarily every water body in the county. 5 of those lakes carry an A–F grade. The county-level summary describes that subset, not every water body listed. With an average grade of B, Addison County sits comfortably above the Vermont median.
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 Dunmore (A); the most-stressed is Otter Creek Section Lake (C).
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Quick Answers for Addison County
Planning a trip? Check special fishing regulations for Lake Dunmore — or check the official Vermont fishing regulations.
All Lakes in Addison County
14 lakes · 5 graded, 9 not rated5 graded lakes · 9 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | ALake DunmoreAddison | A | 16.4 ft | 10.9 µg/L | 2.9 µg/L | No recent samples | ✓ Public |
| 2 | ASilver LakeAddison | A | 8.2 ft | 6.9 µg/L | 1.2 µg/L | No recent samples | Not recorded |
| 3 | COtter Creek Section LakeAddison | C | 9.8 ft | 14.3 µg/L | 6.1 µg/L | No recent samples | ✓ Public |
| 4 | CPort Henry Section LakeAddison | C | 10.8 ft | 13.3 µg/L | 5.9 µg/L | No recent samples | ✓ Public |
| 5 | CFern LakeAddison | C | 20.7 ft | 19 µg/L | 5.3 µg/L | No recent samples | Not recorded |
| NRSpruce PondAddison | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRVergennes Watershed LakeAddison | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRRichville PondAddison | NR | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRSugar Hill ReservoirAddison | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRCedar LakeAddison | NR | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRWinona LakeAddison | NR | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRJerome LakeAddison | NR | No recent samples | 164 µg/L | 40.6 µg/L | No recent samples | ✓ Public | |
| NRL. Champlain LakeAddison | NR | No recent samples | 26.1 µg/L | 4 µg/L | No recent samples | ✓ Public | |
| NRJohnson PondAddison | 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.
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Other Counties in Vermont
See how Addison 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.