De Neveu Lake
De Neveu Lake in Fond du Lac County, Wisconsin has a water quality grade of B (Good). Water clarity: 11 ft visibility. Phosphorus: 18.1 µg/L. Maximum depth: 67 ft. Surface area: 80 acres.
- Clarity
- 11 ft
- Typical in August
- 77°F
- Max depth
- 67 ft
- Area
- 80 acres
- Type
- Mesotrophic
- Trend
- ↓ Declining
Next lake in Fond du Lac County
De Neveu Lake is a 80-acre mesotrophic lake in Fond du Lac County, Wisconsin with a maximum depth of 67 feet. Water quality is graded B based on 1 sampling years through 2025. Overall water quality is declining over recent sampling years. The lake supports 4 documented fish species including Panfish, Largemouth Bass, and Northern Pike. Compared to the 8 other monitored lakes in Fond du Lac County, De Neveu Lake ranks #6 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2025-09-04. Grade methodology: LakeGrade methodology.
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Swimming Safety
Grade onlyLow algae
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)
Good clarity, visible to about 11 ft. Phosphorus level: 18.1 µg/L. Trophic State Index: 44.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 11 ft | Not graded |
| Phosphorus | 18.1 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 44 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near De Neveu Lake
Compare lakeside cabins, hotels, and vacation rentals near De Neveu Lake in Fond du Lac 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.
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Water Temperature
De Neveu Lake typically sits around 77°F at the surface in August. Summer average is about 76°F. Usually warmest in Jul (about 78°F) and coldest in May (about 63°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 17 field readings (2024–2025) via the EPA Water Quality Portal. See the full De Neveu Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 67 ft |
| Surface Area | 80 acres |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Fish Species
Click a species to see every graded lake where it is documented.
Fishing De Neveu Lake
Invasive & Introduced Species
Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 2008. 1 station on file (most recent sample 2025).
Fish Species (DNR-rated)
Water Quality Trend: ↓ Declining
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -1.097 m/yr | 5 |
| Phosphorus | → Stable | +0.01 µg/L/yr | 5 |
EPA Impairment Status
De Neveu Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit WI10000952 · Official waterbody report
Regulated Pollution Sources Nearby
7 EPA-permitted facilities operate within about 5 miles of De Neveu Lake under Clean Water Act (NPDES) discharge permits. 2 facilities have a reported Clean Water Act violation in the past three years.
- Eden Wastewater Treatment FaciEden · 3.1 mi away · NPDES WI0030716Recent violation
- Theresa Wastewater Treatment FacilityTheresa · 3.8 mi away · NPDES WI0022322Recent violation
- Vir Clar Farms LlcEmpire, Town Of · 0.5 mi away · NPDES WI0062651
- Murph Ko Farms IncEden, Town Of · 3.2 mi away · NPDES WI0062740
- Lakeside Foods Inc EdenEden · 4.1 mi away · NPDES WI0000485
- Milk Specialties Global, Fond Du LacFond Du Lac · 4.4 mi away · NPDES WI0000132
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 #6 of 9 lakes in Fond du Lac County
Nearby Lakes in Fond du Lac County
Frequently asked questions about De Neveu Lake
What is the water quality grade for De Neveu Lake?
- De Neveu Lake in Fond du Lac County, Wisconsin has a water quality grade of B (Good). Water clarity: 11 ft visibility. Phosphorus: 18.1 µg/L. Maximum depth: 67 ft. Surface area: 80 acres.
Is De Neveu Lake safe to swim in?
- Good for swimming, clear water with low algae levels. De Neveu Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
What is the water temperature of De Neveu Lake?
- De Neveu Lake typically sits around 77°F at the surface in August, from 17 EPA Water Quality Portal field readings (2024–2025). That is a typical value for the month, not a live reading.
How deep is De Neveu Lake?
- De Neveu Lake has a maximum depth of 67 feet. The lake covers 80 acres.
What fish are in De Neveu Lake?
- Fish species found in De Neveu Lake include Panfish, Largemouth Bass, Northern Pike, Walleye. De Neveu Lake is located in Fond du Lac County, Wisconsin.
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Where this data comes from
35 measurements from 1 monitoring station, 2021–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX35 samples · 2021–2025
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
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)
Fish and recreation data from Wisconsin DNR Lakes