Watts Lake
Ozaukee County, Wisconsin6 acresView mapDirections
Wisconsin DNR publishes the water-quality measurements for Watts Lake. Here is what has been measured.
- 31 ft max depth
- Limited data
Watts Lake in Ozaukee County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 7 ft visibility. Phosphorus: 43.1 µg/L. Maximum depth: 31 ft. Surface area: 6 acres.
Watts Lake is a 6-acre lake in Ozaukee County, Wisconsin with a maximum depth of 31 feet. Overall water quality is declining over recent sampling years.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2025-08-13. Methodology: how these readings are compared.
What Watts Lake is good for
From access and monitoring records, not editorial picks.
- Deep water31 ft surveyed max depth
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Watts 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 Watts Lake
These are the measurements Wisconsin DNR publishes for Watts 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 ft. Phosphorus 43.1 µg/L. TSI 54.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 7ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 43.1µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| 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. | 54 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Watts Lake
Answers come straight from the public measurements and survey records on this page.
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. 1 station on file (most recent sample 2025).
Lake Details
Max depth
31 ft
Surface area
6 acres
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Fishing Watts Lake
Water quality readings over time
2 seasons of samples on record (2024–2025). Calling a direction takes at least 4 years of the same measurement.
Phosphorus
Worsening+30.9 µg/L/yr2 years
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Watts Lake under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Arkema IncSaukville · 3.5 mi away · NPDES WI0027731Recent 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 Watts Lake
Where is Watts Lake?
- Watts 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 Watts Lake?
- Watts Lake in Ozaukee County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 7 ft visibility. Phosphorus: 43.1 µg/L. Maximum depth: 31 ft. Surface area: 6 acres.
Is Watts Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Watts Lake?
- Watts Lake has a maximum depth of 31 feet. The lake covers 6 acres.
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Where this data comes from
2 measurements from 1 monitoring station, 2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX2 samples · 2025
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