Litchfield County Lake Quality
Connecticut, 21 lakes, average grade C (Fair)
There are 21 graded lakes in Litchfield County. The mix is varied enough that the county-level average tells you the broad strokes, not the choose-this-cabin specifics. The county average is C — the middle of the rubric, with one or two lakes pulling the average up or down depending on year.
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 Crystal Lake (B); the most-stressed is Mount Tom Pond (D).
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Quick Answers for Litchfield County
Planning a trip? Check special fishing regulations for Crystal Lake — or check the official Connecticut fishing regulations.
All Lakes in Litchfield County
21 lakes · 11 graded, 10 not rated11 graded lakes · 10 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | BCrystal LakeLitchfield | B | No recent samples | 9 µg/L | 1.4 µg/L | No recent samples | Not recorded |
| 2 | BEast Twin LakeLitchfield | B | No recent samples | 10 µg/L | 2.4 µg/L | No recent samples | Not recorded |
| 3 | BTobey PondLitchfield | B | No recent samples | 8 µg/L | 0.5 µg/L | No recent samples | Not recorded |
| 4 | BWest Hill PondLitchfield | B | No recent samples | 9 µg/L | 1.6 µg/L | No recent samples | Not recorded |
| 5 | BWononpakook LakeLitchfield | B | No recent samples | 15 µg/L | 3.3 µg/L | No recent samples | Not recorded |
| 6 | CHighland LakeLitchfield | C | No recent samples | 17 µg/L | 2.3 µg/L | No recent samples | Not recorded |
| 7 | CLake WaramaugLitchfield | C | No recent samples | 23 µg/L | 10.9 µg/L | No recent samples | Not recorded |
| 8 | CMohawk PondLitchfield | C | No recent samples | 17 µg/L | 2.4 µg/L | No recent samples | Not recorded |
| 9 | CWononscopomuc LakeLitchfield | C | No recent samples | 17 µg/L | 1.9 µg/L | No recent samples | Not recorded |
| 10 | CWoodridge LakeLitchfield | C | No recent samples | 18 µg/L | 4.2 µg/L | No recent samples | Not recorded |
| 11 | DMount Tom PondLitchfield | D | No recent samples | 31 µg/L | 5.5 µg/L | No recent samples | Not recorded |
| NRBantam LakeLitchfield | NR | 6.1 ft | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRLake LillinonahLitchfield | NR | 8.3 ft | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRLake PlymouthLitchfield | NR | 3.5 ft | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRLake WinchesterLitchfield | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRLaurel LakeLitchfield | NR | 18.7 ft | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRLong Meadow PondLitchfield | NR | 6 ft | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRMudge PondLitchfield | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRWashinee LakeLitchfield | NR | 11.5 ft | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRWashining LakeLitchfield | NR | 15.5 ft | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRWononskopomuc LakeLitchfield | NR | 15.8 ft | No recent samples | No recent samples | No recent samples | Not recorded |
NR = not rated: the monitoring record does not meet the evidence bar for a grade. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.
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Other Counties in Connecticut
See how Litchfield 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.