Sandhill Lake
Ozaukee County, Wisconsin5 acresView mapDirections
Wisconsin DNR publishes the water-quality measurements for Sandhill Lake. Here is what has been measured.
- Mesotrophic
- 9 ft max depth
- Limited data
Sandhill Lake in Ozaukee County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 7.5 ft visibility. Phosphorus: 24.7 µg/L. Maximum depth: 9 ft. Surface area: 5 acres.
Sandhill Lake is a 5-acre mesotrophic lake in Ozaukee County, Wisconsin with a maximum depth of 9 feet. Overall water quality is improving over recent sampling years.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2026-06-07. Methodology: how these readings are compared.
Swimming conditions
Readings onlyLimited data
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Sandhill Lake is safe to swim in today is a call for the Wisconsin Department of Natural Resources and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Sandhill Lake
These are the measurements Wisconsin DNR publishes for Sandhill Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Moderate clarity, visible to about 7.5 ft. Phosphorus 24.7 µg/L. TSI 49.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 7.5ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 24.7µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 49 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Sandhill Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Sandhill Lake typically sits around 55°F at the surface in October. Summer average is about 76°F. Usually warmest in Jul (about 80°F) and coldest in Oct (about 55°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (55°F) to its warmest (80°F).
Typical surface water temperature by month, from 51 field readings (2025–2025) via the EPA Water Quality Portal. See the full Sandhill Lake water temperature breakdown →
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 2025. 1 station on file (most recent sample 2025).
Lake Details
Max depth
9 ft
Surface area
5 acres
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Stays near Sandhill Lake
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Fishing Sandhill Lake
Water quality readings over time
3 seasons of samples on record (2024–2026). Calling a direction takes at least 4 years of the same measurement.
Phosphorus
Improving-20.6 µg/L/yr3 years
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Sandhill Lake under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Opitz Dairy FarmSaukville, Town Of · 1.2 mi away · NPDES WI0062600Recent violation
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
Nearby Lakes in Ozaukee County
Frequently asked questions about Sandhill Lake
Where is Sandhill Lake?
- Sandhill Lake is a lake in Ozaukee County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.
What is the water quality of Sandhill Lake?
- Sandhill Lake in Ozaukee County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 7.5 ft visibility. Phosphorus: 24.7 µg/L. Maximum depth: 9 ft. Surface area: 5 acres.
Is Sandhill Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
What is the water temperature of Sandhill Lake?
- Sandhill Lake typically sits around 55°F at the surface in October, from 51 EPA Water Quality Portal field readings (2025–2025). That is a typical value for the month, not a live reading.
How deep is Sandhill Lake?
- Sandhill Lake has a maximum depth of 9 feet. The lake covers 5 acres.
Explore Sandhill Lake across LakeQuality
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Where this data comes from
20 measurements from 1 monitoring station, 2025–2026. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX20 samples · 2025–2026
Analytical methods
- Phosphorus by Colorimetry
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Fish and recreation data from Wisconsin DNR Lakes