Oneida Lake
Oneida Lake in Outagamie County, Wisconsin has a water quality grade of A (Excellent). Phosphorus: 15 µg/L. Chlorophyll-a (algae): 1.4 µg/L. Surface area: 12 acres.
- Typical in August
- 75°F
- Area
- 12 acres
- Type
- Oligotrophic
- Trend
- ↑ Improving
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Oneida Lake is a 12-acre cold, clear oligotrophic lake in Outagamie County, Wisconsin. Water quality is graded A based on 2 sampling years through 2025. 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. Grade methodology: LakeQuality 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.
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A (Excellent)
No clarity data. Phosphorus level: 15 µg/L. Chlorophyll-a: 1.4 µg/L. Trophic State Index: 39.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 15 µg/L | Good |
| Chlorophyll-a (Algae) | 1.4 µg/L | Good |
| Trophic State Index (TSI) | 39 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Oneida Lake
Compare lakeside cabins, hotels, and vacation rentals near Oneida Lake in Outagamie 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 Oneida Lake
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Water Temperature
Oneida Lake typically sits around 75°F at the surface in August. 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.
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
| Characteristic | Value |
|---|---|
| Surface Area | 12 acres |
No bathymetric survey has been published for Oneida Lake, so its depth is not documented here.
Fishing Oneida Lake
Water Quality Trend: ↑ Improving
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↑ Improving | -0.8 µg/L/yr | 5 |
| Chlorophyll-a | ↑ Improving | -0.25 µg/L/yr | 5 |
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.
County Ranking
Ranked #1 of 1 lakes in Outagamie County
Nearby Lakes in Outagamie County
Frequently asked questions about Oneida Lake
Where is Oneida Lake?
- Oneida Lake is a lake in Outagamie County, Wisconsin. LakeQuality grades it A for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Oneida Lake?
- Oneida Lake in Outagamie County, Wisconsin has a water quality grade of A (Excellent). Phosphorus: 15 µg/L. Chlorophyll-a (algae): 1.4 µg/L. Surface area: 12 acres.
Is Oneida Lake safe to swim in?
- Excellent for swimming, crystal clear water with minimal algae. Oneida Lake has a water quality grade of A (Excellent). Algae concentration (chlorophyll-a) is 1.4 µg/L. Always check local health department advisories before swimming.
What is the water temperature of Oneida Lake?
- Oneida Lake typically sits around 75°F at the surface in August, 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)
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