New London County Lake Quality
Connecticut, 19 lakes, average grade C (Fair)
New London County's 19 graded lakes fall in the moderate-density bracket for Connecticut. 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. New London County averages to a C. The distribution behind that average matters more than the letter: a few stressed lakes versus many decent ones can produce the same average as the inverse.
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 (B) is the cleanest in the county.
Where to stay near New London County
Top-rated places to stay near New London County
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a trip to New London County?
Get lake water-quality report cards plus the best cabin & lodging deals near New London County — straight to your inbox. No spam, unsubscribe anytime.
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 graded, 9 not rated10 graded lakes · 9 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | BBeach PondNew London | B | No recent samples | 5 µg/L | 1.6 µg/L | No recent samples | Not recorded |
| 2 | BBillings LakeNew London | B | No recent samples | 16 µg/L | 1.6 µg/L | No recent samples | Not recorded |
| 3 | BLong PondNew London | B | No recent samples | 12 µg/L | 1.5 µg/L | No recent samples | Not recorded |
| 4 | BNorwich PondNew London | B | No recent samples | 15 µg/L | 0.7 µg/L | No recent samples | Not recorded |
| 5 | CAmos LakeNew London | C | No recent samples | 27.5 µg/L | 4.3 µg/L | No recent samples | Not recorded |
| 6 | CGardner LakeNew London | C | No recent samples | 26 µg/L | 1.7 µg/L | No recent samples | Not recorded |
| 7 | CPataganset LakeNew London | C | No recent samples | 20 µg/L | 7.6 µg/L | No recent samples | Not recorded |
| 8 | CRogers LakeNew London | C | No recent samples | 20 µg/L | 1.9 µg/L | No recent samples | Not recorded |
| 9 | CUncas PondNew London | C | No recent samples | 21 µg/L | 2.1 µg/L | No recent samples | Not recorded |
| 10 | DWyassup LakeNew London | D | No recent samples | 38 µg/L | 4.6 µg/L | No recent samples | Not recorded |
| NRAndersons PondNew London | NR | No recent samples | 32 µg/L | 5.1 µg/L | No recent samples | Not recorded | |
| NRAvery PondNew London | NR | 2 ft | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRBush PondNew London | NR | 7.5 ft | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRDoaneville PondNew London | NR | 4.6 ft | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRGlasgo PondNew London | NR | 5.9 ft | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRPachaug PondNew London | NR | 10.3 ft | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRPattagansett LakeNew London | NR | 6.8 ft | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRPowers LakeNew London | NR | No recent samples | 9 µg/L | 1.1 µg/L | No recent samples | Not recorded | |
| NRWilliams PondNew London | NR | 6.4 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.
Lake Match
Which lake suits how you actually use one?
Six questions — swimming, fishing, quiet, cabins, drive time — and a shortlist of graded lakes that fit, with the water quality behind each one.
Other Counties in Connecticut
See how New London 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.