A
Hatch Lake -
Waukesha County, Wisconsin
Water Quality Grade: A — Excellent
Crystal clear — you can see 27.6 feet down. Phosphorus level: 19.2 µg/L.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 8.4 m | A |
| Phosphorus | 19.2 µg/L | A |
| Chlorophyll-a (Algae) | No data |
County Ranking
Ranked #19 of 30 lakes in Waukesha County
Data Sources
Data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2025-09-01
Monitoring stations: 1