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LakeQuality

Oconomowoc Lake Site vs Okauchee Lake

Water quality, depth, fish species, and recreation comparison.

Oconomowoc Lake Site and Okauchee Lake both received the same overall water quality grade of A (Excellent). Both are in Waukesha County, Wisconsin.

Both Oconomowoc Lake Site and Okauchee Lake sit in Wisconsin. A same-state comparison strips out the state-level water-quality regime as a variable: any grade differences here are about the lakes themselves, not the agencies grading them. The grades are close: Oconomowoc Lake Site (A) and Okauchee Lake (A) are within one letter of each other on the LakeGrade rubric. The per-parameter sub-grades below will show where the small differences actually live.

With grades this close, the choice between the two lakes turns on non-water-quality factors: depth, fish species, public access, distance from home. The per-lake pages below cover all of those.

A

Oconomowoc Lake Site

Waukesha County, Wisconsin

Good clarity, visible to about 13 ft.

A

Okauchee Lake

Waukesha County, Wisconsin

Good clarity, visible to about 12 ft.

Side-by-Side Metrics

Source: EPA National Aquatic Resource Surveys, 2026.

Source: EPA National Aquatic Resource Surveys, 2026.

Source: EPA National Aquatic Resource Surveys, 2026.

Source: EPA National Aquatic Resource Surveys, 2026.

Source: EPA National Aquatic Resource Surveys, 2026.

Source: EPA National Aquatic Resource Surveys, 2026.

Source: EPA National Aquatic Resource Surveys, 2026.

Source: EPA National Aquatic Resource Surveys, 2026.

Source: EPA National Aquatic Resource Surveys, 2026.

MetricOconomowoc Lake SiteOkauchee Lake
Overall GradeA (Excellent)A (Excellent)
Water Clarity13 ft12 ft
Phosphorus13.8 µg/L17.1 µg/L
Chlorophyll-a (Algae)No dataNo data
Maximum Depth60 ft90 ft
Surface Area818 acres1.2K acres
Public AccessUnknownUnknown
Fish Species00
Trophic Statemesotrophicmesotrophic

Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).

Verdict

Both lakes earn the same Grade A. The tiebreakers come down to clarity (Oconomowoc Lake Site: 13 ft, Okauchee Lake: 12 ft) and what you want from the lake. Oconomowoc Lake Site matches its peer on species count.