Green Lake County Lake Quality
Wisconsin, 11 lakes, average grade C (Fair)
Green Lake County has 11 graded 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. Green Lake 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.
A meaningful share of Green Lake's lakes break 50 feet of depth, which matters because deep lakes hold cooler water all summer and resist the resuspended-sediment problems that plague shallow basins. The county's best-graded lake is Green Lake (A).
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Quick Answers for Green Lake County
Planning a trip? Check special fishing regulations for Green Lake, whether the fish are safe to eat, and the best times to fish — or browse the full Wisconsin regulations index.
Fishing in Green Lake County
DNR Reports (6)
Wisconsin DNR Fisheries Survey resources for lakes in Green Lake County. browse all reports →
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- 2024Little Green Lake comprehensive survey, 2024Comprehensive Survey · WI DNR · 2024 (PDF)
- 2023Big Green Lake creel survey, 2023Creel Survey · WI DNR · 2023 (PDF)
- 2023Big Twin Lake spring shocking survey, 2023Spring Shocking Survey · WI DNR · 2023 (PDF)
- 2023Lake Puckaway summary survey, 2023Fisheries Survey · WI DNR · 2023 (PDF)
- 2022Big Green Lake comprehensive survey, 2022Comprehensive Survey · WI DNR · 2022 (PDF)
- 2018Spring Lake comprehensive survey, 2018Comprehensive Survey · WI DNR · 2018 (PDF)
All Lakes in Green Lake County
11 lakes · 7 graded, 4 not rated7 graded lakes · 4 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Max Depth | Access |
|---|---|---|---|---|---|---|---|---|
| 1 | AGreen LakeGreen Lake | A | 13.5 ft | 38.1 µg/L | 4.4 µg/L | No recent samples | 236 ft | ✓ Public |
| 2 | BGreen LakeGreen Lake | B | No recent samples | 20.6 µg/L | No recent samples | No recent samples | 236 ft | ✓ Public |
| 3 | CGreen Lake East BasinGreen Lake | C | 11.8 ft | 41 µg/L | No recent samples | No recent samples | 236 ft | ✓ Public |
| 4 | DLake PuckawayGreen Lake | D | 4.4 ft | 52.1 µg/L | No recent samples | No recent samples | 5 ft | ✓ Public |
| 5 | DLittle Green LakeGreen Lake | D | 3.2 ft | 92.8 µg/L | No recent samples | No recent samples | 28 ft | ✓ Public |
| 6 | DCounty K Marsh LakeGreen Lake | D | No recent samples | 140 µg/L | No recent samples | No recent samples | No recent samples | ✓ Public |
| 7 | DSilver Creek Estuary LakeGreen Lake | D | No recent samples | 125.5 µg/L | No recent samples | No recent samples | 236 ft | ✓ Public |
| NRBig Twin LakeGreen Lake | NR | 7 ft | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRGreen LakeGreen Lake | NR | 13 ft | No recent samples | No recent samples | No recent samples | 236 ft | ✓ Public | |
| NRLittle Twin LakeGreen Lake | NR | 1.5 ft | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRCity MillpondGreen Lake | NR | No recent samples | 38.4 µg/L | No recent samples | No recent samples | 236 ft | ✓ Public |
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 Wisconsin
See how Green Lake County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 39 states and 2 Canadian provinces.
Source: EPA National Aquatic Resource Surveys, 2026.