How Clean Is Oconomowoc Lake?
Oconomowoc Lake is among the cleanest lakes in Wisconsin. It received a water quality grade of A (Excellent) based on EPA monitoring data. Water clarity (Secchi depth): 13 ft. Phosphorus: 11.7 µg/L. Trophic State Index: 40.
Cleanliness Snapshot
| Metric | Oconomowoc Lake | Wisconsin avg |
|---|---|---|
| Overall Grade | A | C |
| Water Clarity (Secchi) | 13 ft | — |
| Phosphorus | 11.7 µg/L | <30 = clean |
| Trophic State Index | 40 | <50 = clean |
How does Oconomowoc Lake compare?
Oconomowoc Lake's grade of A matches or beats the Wisconsin state average of C. It ranks #14 of 45 lakes in Waukesha County by water quality score. Multi-year monitoring data shows water quality is improving based on 6 years of records.