Tolland County Lake Quality
Connecticut, 13 lakes, measured by CT DEEP
Tolland County has 13 monitored lakes — a thin enough sample that one or two stressed lakes can move the county average noticeably. Use the per-lake pages below for what actually matters. 4 of those lakes carry recent nutrient and algae readings. The county-level summary describes that subset, not every water body listed. Most monitored lakes in Tolland County carry favourable nutrient and algae readings for Connecticut.
The county's lakes lean shallow, which makes the readings sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest measured lake is Crystal Lake.
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Quick Answers for Tolland County
Planning a trip? Check special fishing regulations for Crystal Lake — or check the official Connecticut fishing regulations.
All Lakes in Tolland County
13 lakes · 4 ranked on readings, 9 without enough sampling4 lakes ranked on readings · 9 without enough sampling, hidden
| # | Lake | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|
| 1 | Crystal LakeTolland | No recent samples | 13 µg/L | 2.1 µg/L | No recent samples | ✓ Public |
| 2 | Halls PondTolland | No recent samples | 15.5 µg/L | 3.5 µg/L | No recent samples | Not recorded |
| 3 | Mashapaug PondTolland | No recent samples | 8 µg/L | 1.6 µg/L | No recent samples | ✓ Public |
| 4 | Coventry LakeTolland | No recent samples | 18 µg/L | 2.9 µg/L | No recent samples | ✓ Public |
| Andover LakeTolland | 10.2 ft | No recent samples | No recent samples | No recent samples | Not recorded | |
| Bigelow PondTolland | 12.3 ft | No recent samples | No recent samples | No recent samples | ✓ Public | |
| Bolton LakeTolland | 8.5 ft | No recent samples | No recent samples | No recent samples | ✓ Public | |
| Breakneck PondTolland | No recent samples | 25.5 µg/L | 6.7 µg/L | No recent samples | Not recorded | |
| Hurds LakeTolland | 4.8 ft | No recent samples | No recent samples | No recent samples | Not recorded | |
| Mansfield Hollow LakeTolland | 7.5 ft | No recent samples | No recent samples | No recent samples | ✓ Public | |
| Morey PondTolland | 10.1 ft | No recent samples | No recent samples | No recent samples | ✓ Public | |
| Somersville PondTolland | 4.1 ft | No recent samples | No recent samples | No recent samples | Not recorded | |
| Wangumbaug LakeTolland | 11.5 ft | No recent samples | No recent samples | No recent samples | Not recorded |
NR = no nutrient or algae reading on record. The measurements are published as the authority reports them. Where the data comes from.
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Source: the Connecticut Department of Energy and Environmental Protection. See data sources.