A
Lower Nashotah Lake
Waukesha County, Wisconsin
Water Quality Grade: A — Excellent
Crystal clear — you can see 29.5 feet down. Phosphorus level: 11.3 µg/L.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 9 m | A |
| Phosphorus | 11.3 µg/L | A |
| Chlorophyll-a (Algae) | No data |
Location
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County Ranking
Ranked #11 of 48 lakes in Waukesha County
Data Sources
Data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2025-10-22
Monitoring stations: 2