New London County Lake Quality
Connecticut, 19 lakes, measured by CT DEEP
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. 10 of those lakes carry recent nutrient and algae readings. The county-level summary describes that subset, not every water body listed. The county's readings sit in the middle of the Connecticut range, with one or two lakes pulling the average up or down depending on year.
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. Beach Pond has the lowest nutrient and algae readings in the county.
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Quick Answers for New London County
Planning a trip? Check special fishing regulations for Beach Pond — or check the official Connecticut fishing regulations.
All Lakes in New London County
19 lakes · 10 ranked on readings, 9 without enough sampling10 lakes ranked on readings · 9 without enough sampling, hidden
| # | Lake | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|
| 1 | Beach PondNew London | No recent samples | 5 µg/L | 1.6 µg/L | No recent samples | ✓ Public |
| 2 | Billings LakeNew London | No recent samples | 16 µg/L | 1.6 µg/L | No recent samples | ✓ Public |
| 3 | Long PondNew London | No recent samples | 12 µg/L | 1.5 µg/L | No recent samples | ✓ Public |
| 4 | Norwich PondNew London | No recent samples | 15 µg/L | 0.7 µg/L | No recent samples | ✓ Public |
| 5 | Amos LakeNew London | No recent samples | 27.5 µg/L | 4.3 µg/L | No recent samples | Not recorded |
| 6 | Gardner LakeNew London | No recent samples | 26 µg/L | 1.7 µg/L | No recent samples | ✓ Public |
| 7 | Pataganset LakeNew London | No recent samples | 20 µg/L | 7.6 µg/L | No recent samples | Not recorded |
| 8 | Rogers LakeNew London | No recent samples | 20 µg/L | 1.9 µg/L | No recent samples | ✓ Public |
| 9 | Uncas PondNew London | No recent samples | 21 µg/L | 2.1 µg/L | No recent samples | ✓ Public |
| 10 | Wyassup LakeNew London | No recent samples | 38 µg/L | 4.6 µg/L | No recent samples | ✓ Public |
| Andersons PondNew London | No recent samples | 32 µg/L | 5.1 µg/L | No recent samples | ✓ Public | |
| Avery PondNew London | 2 ft | No recent samples | No recent samples | No recent samples | ✓ Public | |
| Bush PondNew London | 7.5 ft | No recent samples | No recent samples | No recent samples | Not recorded | |
| Doaneville PondNew London | 4.6 ft | No recent samples | No recent samples | No recent samples | ✓ Public | |
| Glasgo PondNew London | 5.9 ft | No recent samples | No recent samples | No recent samples | ✓ Public | |
| Pachaug PondNew London | 10.3 ft | No recent samples | No recent samples | No recent samples | Not recorded | |
| Pattagansett LakeNew London | 6.8 ft | No recent samples | No recent samples | No recent samples | ✓ Public | |
| Powers LakeNew London | No recent samples | 9 µg/L | 1.1 µg/L | No recent samples | ✓ Public | |
| Williams PondNew London | 6.4 ft | No recent samples | No recent samples | No recent samples | ✓ Public |
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.