How Clean Is Pewaukee Lake?
Pewaukee 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): 18.9 ft. Phosphorus: 19.9 µg/L. Trophic State Index: 41.
Cleanliness Snapshot
| Metric | Pewaukee Lake | Wisconsin avg |
|---|---|---|
| Overall Grade | A | B |
| Water Clarity (Secchi) | 18.9 ft | — |
| Phosphorus | 19.9 µg/L | <30 = clean |
| Trophic State Index | 41 | <50 = clean |
How does Pewaukee Lake compare?
Pewaukee Lake's grade of A matches or beats the Wisconsin state average of B. It ranks #4 of 48 lakes in Waukesha County by water quality score. Multi-year monitoring data shows water quality is improving based on 7 years of records.