Oneida Lake
Outagamie County, Wisconsin12 acresView mapDirections
Wisconsin DNR publishes the water-quality measurements for Oneida Lake. Here is what has been measured.
- Oligotrophic
Oneida Lake in Outagamie County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Phosphorus: 15 µg/L. Chlorophyll-a (algae): 1.4 µg/L. Surface area: 12 acres.
Oneida Lake is a 12-acre cold, clear oligotrophic lake in Outagamie County, Wisconsin. Overall water quality is improving over recent sampling years.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2025-09-16. Methodology: how these readings are compared.
Swimming conditions
Readings onlyLow algae
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 Oneida 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 Oneida Lake
These are the measurements Wisconsin DNR publishes for Oneida Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. Phosphorus 15 µg/L. Chlorophyll-a 1.4 µg/L. TSI 39.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | 15µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 1.4µg/L | Good GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 39 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Oneida Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Oneida Lake typically sits around 70°F at the surface in September. Summer average is about 75°F. Usually warmest in Jul (about 77°F) and coldest in Apr (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 (77°F).
Typical surface water temperature by month, from 58 field readings (2024–2025) via the EPA Water Quality Portal. See the full Oneida Lake water temperature breakdown →
Lake Details
Surface area
12 acres
No bathymetric survey has been published for Oneida Lake, so its depth is not documented here.
Stays via Stay22
Stays near Oneida Lake
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Fishing Oneida Lake
Water Quality Trend: Improving
Based on 5 years of monitoring (2021–2025).
Phosphorus
Improving-0.8 µg/L/yr5 years
Chlorophyll-a
Improving-0.25 µg/L/yr5 years
Regulated Pollution Sources Nearby
2 EPA-permitted facilities operate within about 5 miles of Oneida Lake under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Ranovael DairyDe Pere, Town Of · 2.1 mi away · NPDES WI0062821Recent violation
- Paxton Wtp, City OfPaxton · 2.7 mi away · NPDES IL0069388
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 Outagamie County
Frequently asked questions about Oneida Lake
Where is Oneida Lake?
- Oneida Lake is a lake in Outagamie County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.
What is the water quality of Oneida Lake?
- Oneida Lake in Outagamie County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Phosphorus: 15 µg/L. Chlorophyll-a (algae): 1.4 µg/L. Surface area: 12 acres.
Is Oneida 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 Oneida Lake?
- Oneida Lake typically sits around 70°F at the surface in September, from 58 EPA Water Quality Portal field readings (2024–2025). That is a typical value for the month, not a live reading.
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Where this data comes from
63 measurements from 1 monitoring station, 2021–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Oneida Nation
ONEIDA_WQX63 samples · 2021–2025
Analytical methods
- 4500 P E ~ Phosphorus in Water by Colorimetry- Ascorbic Acid Method
- 4500 P F ~ Phosphorus in Water by Colorimetry Automated Ascorbic Acid Method
- 4500 P E ~ Phosphorus by Ascorbic Acid
- UNKNOWN
- 10200 H ~ Chlorophyll a-b-c Determination
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