How Clean Is Lake Poygan?
Lake Poygan has very poor water quality and a high algae bloom risk. It received a water quality grade of F (Very Poor) based on EPA monitoring data. Water clarity (Secchi depth): 2.5 ft. Trophic State Index: 64.
Cleanliness Snapshot
| Metric | Lake Poygan | Wisconsin avg |
|---|---|---|
| Overall Grade | F | C |
| Water Clarity (Secchi) | 2.5 ft | — |
| Trophic State Index | 64 | <50 = clean |
How does Lake Poygan compare?
Lake Poygan's grade of F falls below the Wisconsin state average of C. It ranks #4 of 5 lakes in Winnebago County by water quality score. Multi-year monitoring data shows water quality is stable based on 6 years of records.