Watts Lake
Watts Lake in Ozaukee County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 7 ft visibility. Phosphorus: 43.1 µg/L. Maximum depth: 31 ft. Surface area: 6 acres.
- Clarity
- 7 ft
- Max depth
- 31 ft
- Area
- 6 acres
- Trend
- ↓ Declining
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Why Watts Lake has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Watts Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded water clarity and phosphorus, but not algae (chlorophyll-a).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by WI DNR and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
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. Grade methodology: LakeQuality methodology.
Watch Watts Lake water quality
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Watts Lake
These readings exist but are not enough for an A–F grade — see why.
Moderate clarity, visible to about 7 ft. Phosphorus level: 43.1 µg/L. Trophic State Index: 54.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 7 ft | Not graded |
| Phosphorus | 43.1 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 54 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Watts Lake
Compare lakeside cabins, hotels, and vacation rentals near Watts 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 Watts Lake
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WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. 1 station on file (most recent sample 2025).
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 31 ft |
| Surface Area | 6 acres |
Fishing Watts Lake
Water Quality Trend: ↓ Declining
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↓ Declining | +30.9 µg/L/yr | 2 |
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.
Graded lakes near Watts Lake
Watts Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Ozaukee County
Frequently asked questions about Watts Lake
Where is Watts Lake?
- Watts Lake is a lake in Ozaukee County, Wisconsin. LakeQuality has not rated this lake (UNRATED) — there is not enough recent sampling to assign a letter.
What is the water quality grade for Watts Lake?
- Watts Lake in Ozaukee County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. 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?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Watts Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
How deep is Watts Lake?
- Watts Lake has a maximum depth of 31 feet. The lake covers 6 acres.
Explore Watts Lake across LakeQuality
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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)
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