A
Lower Nemahbin Lake -
Washington County, Wisconsin
Water Quality Grade: A — Excellent
Crystal clear — you can see 36.1 feet down. Phosphorus level: 11 µg/L.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 11 m | A |
| Phosphorus | 11 µg/L | A |
| Chlorophyll-a (Algae) | No data |
County Ranking
Ranked #23 of 68 lakes in Washington County
Data Sources
Data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2025-10-14
Monitoring stations: 1