Sandhill Lake
Sandhill Lake in Ozaukee County, Wisconsin has a water quality grade of B (Good). Water clarity: 7.5 ft visibility. Phosphorus: 24.7 µg/L. Maximum depth: 9 ft. Surface area: 5 acres.
- Clarity
- 7.5 ft
- Typical in August
- 74°F
- Max depth
- 9 ft
- Area
- 5 acres
- Type
- Mesotrophic
- Trend
- ↑ Improving
Next lake in Ozaukee County
Swipe left or right on this bar to open the next or previous lake.
Sandhill Lake is a 5-acre mesotrophic lake in Ozaukee County, Wisconsin with a maximum depth of 9 feet. Water quality is graded B based on 1 sampling years through 2026. 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. Grade methodology: LakeQuality methodology.
Watch Sandhill Lake water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Grade onlyLimited data
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Good for swimming, clear water with low algae levels
Water Quality Grade: B (Good)
Moderate clarity, visible to about 7.5 ft. Phosphorus level: 24.7 µg/L. Trophic State Index: 49.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 7.5 ft | Not graded |
| Phosphorus | 24.7 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 49 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Sandhill Lake
Compare lakeside cabins, hotels, and vacation rentals near Sandhill Lake in Ozaukee County, Wisconsin — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Sandhill Lake
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Wisconsin’s top lakes →
Water Temperature
Sandhill Lake typically sits around 74°F at the surface in August. 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.
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
| Characteristic | Value |
|---|---|
| Maximum Depth | 9 ft |
| Surface Area | 5 acres |
Fishing Sandhill Lake
Water Quality Trend: ↑ Improving
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↑ Improving | -20.6 µg/L/yr | 3 |
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.
County Ranking
Ranked #1 of 1 lakes in Ozaukee County
Nearby Lakes in Ozaukee County
Frequently asked questions about Sandhill Lake
Where is Sandhill Lake?
- Sandhill Lake is a lake in Ozaukee County, Wisconsin. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Sandhill Lake?
- Sandhill Lake in Ozaukee County, Wisconsin has a water quality grade of B (Good). 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?
- Good for swimming, clear water with low algae levels. Sandhill Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
What is the water temperature of Sandhill Lake?
- Sandhill Lake typically sits around 74°F at the surface in August, 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
Fish species and top-graded lakes across Wisconsin
Fish species and best lakes in Ozaukee County
Species activity outlook by water temperature and season
Where to stay at Wisconsin's top lakes, each with its grade
Moderate nutrients, good water quality
Wisconsin's cleanest and most-polluted lakes, ranked
More Wisconsin Lake Rankings
State Parks Near Sandhill Lake
Other Grade B Lakes in Wisconsin
Mesotrophic Lakes in Wisconsin
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)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Fish and recreation data from Wisconsin DNR Lakes