Ozaukee County Lake Quality
Wisconsin, 13 lakes, measured by Wisconsin DNR
Ozaukee County has 13 monitored lakes — a thin enough sample that one or two stressed lakes can move the county average noticeably. Use the per-lake pages below for what actually matters. 1 of those lake carry recent nutrient and algae readings. The county-level summary describes that subset, not every water body listed. Most monitored lakes in Ozaukee County carry favourable nutrient and algae readings for Wisconsin.
The county's lakes lean shallow, which makes the readings sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest measured lake is Sandhill Lake.
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Quick Answers for Ozaukee County
Planning a trip? Check special fishing regulations for Sandhill Lake — or browse the full Wisconsin regulations index.
Fishing in Ozaukee County
All Lakes in Ozaukee County
13 lakes · 1 ranked on readings, 12 without enough sampling1 lake ranked on readings · 12 without enough sampling, hidden
| # | Lake | Clarity | Phosphorus | Algae | Trophic | Max Depth | Access |
|---|---|---|---|---|---|---|---|
| 1 | Sandhill LakeOzaukee | 7.5 ft | 24.7 µg/L | No recent samples | No recent samples | 9 ft | Not recorded |
| Spring LakeOzaukee | 2.5 ft | No recent samples | No recent samples | No recent samples | 22 ft | Not recorded | |
| Unnamed LakeOzaukee | No recent samples | 12.2 µg/L | No recent samples | No recent samples | No recent samples | Not recorded | |
| Cty E PondOzaukee | 3.7 ft | 33.6 µg/L | No recent samples | No recent samples | 6 ft | Not recorded | |
| Watts LakeOzaukee | 7 ft | 43.1 µg/L | No recent samples | No recent samples | 31 ft | Not recorded | |
| Thiensville MillpondOzaukee | No recent samples | 166 µg/L | No recent samples | No recent samples | No recent samples | ✓ Public | |
| Grafton MillpondOzaukee | No recent samples | 110 µg/L | No recent samples | No recent samples | No recent samples | ✓ Public | |
| Hawthorne Hills PondOzaukee | No recent samples | 57.6 µg/L | No recent samples | No recent samples | No recent samples | Not recorded | |
| Moldenhauer LakeOzaukee | No recent samples | 12.2 µg/L | No recent samples | No recent samples | 32 ft | Not recorded | |
| Lac Du CoursOzaukee | No recent samples | No recent samples | No recent samples | No recent samples | 13 ft | Not recorded | |
| Pit LakeOzaukee | No recent samples | No recent samples | No recent samples | No recent samples | 14 ft | Not recorded | |
| Long LakeOzaukee | No recent samples | No recent samples | No recent samples | No recent samples | 5 ft | Not recorded | |
| Mud LakeOzaukee | No recent samples | No recent samples | No recent samples | No recent samples | 4 ft | Not recorded |
NR = no nutrient or algae reading on record. The measurements are published as the authority reports them. Where the data comes from.
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Source: the Wisconsin Department of Natural Resources. See data sources.