How Clean Is Green Lake?
Green Lake is a clean lake by Wisconsin standards. It received a water quality grade of B (Good) based on EPA monitoring data. Water clarity (Secchi depth): 14.1 ft. Phosphorus: 32 µg/L. Trophic State Index: 47.
Cleanliness Snapshot
| Metric | Green Lake | Wisconsin avg |
|---|---|---|
| Overall Grade | B | C |
| Water Clarity (Secchi) | 14.1 ft | — |
| Phosphorus | 32 µg/L | <30 = clean |
| Trophic State Index | 47 | <50 = clean |
How does Green Lake compare?
Green Lake's grade of B matches or beats the Wisconsin state average of C. It ranks #4 of 13 lakes in Green Lake County by water quality score. Multi-year monitoring data shows water quality is improving based on 6 years of records.