Wassermann Lake
Carver County, MinnesotaView mapDirections
Minnesota PCA publishes the water-quality measurements for Wassermann Lake. Here is what has been measured.
- Eutrophic
- Impaired · Impaired biota (cause unknown)
- Eurasian watermilfoil
- Public access
Wassermann Lake in Carver County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 2.3 ft visibility. Phosphorus: 76 µg/L. Chlorophyll-a (algae): 48.1 µg/L.
Wassermann Lake is a productive, nutrient-rich eutrophic lake in Carver County, Minnesota. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available. Compared to the 37 other monitored lakes in Carver County, Wassermann Lake ranks #23 for water quality.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2021-09-29. Methodology: how these readings are compared.
Swimming conditions
Readings onlyRecreation use not supported
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. Wassermann Lake is listed impaired under Clean Water Act §303(d) (IR 5) for impaired biota (cause unknown), mercury, nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Whether Wassermann Lake is safe to swim in today is a call for the Minnesota Pollution Control Agency and the Minnesota DNR and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Wassermann Lake
These are the measurements Minnesota PCA publishes for Wassermann Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Very murky, less than 2.3 ft of visibility. Phosphorus 76 µg/L. Chlorophyll-a 48.1 µg/L. TSI 67.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 2.3ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 76µg/L | Poor GoodFairPoor |
| Chlorophyll-a (algae) | 48.1µg/L | Poor GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 67 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Wassermann Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Wassermann Lake typically sits around 57°F at the surface in October. Summer average is about 64°F. Usually warmest in Aug (about 66°F) and coldest in Nov (about 45°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (45°F) to its warmest (66°F).
Typical surface water temperature by month, from 1,228 field readings (2010–2025) via the EPA Water Quality Portal. See the full Wassermann Lake water temperature breakdown →
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Wassermann Lake. 1 report on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Public Water Access Sites — Wassermann (Main)Public Water Access Sites · MN DNR LakeFinder
Stays via Stay22
Stays near Wassermann Lake
Compare lakeside cabins, hotels, and vacation rentals near Wassermann Lake in Carver County, Minnesota — 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. The water-quality readings cover nutrients and algae, not lodging. Cabins and rentals around Wassermann Lake are listed below.
Top-rated places to stay near Wassermann Lake
Prices for Oct 9–11, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Minnesota’s top lakes →
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Fishing Wassermann 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.
Water Quality Trend: Worsening
Based on 6 years of monitoring (2020–2025).
Water clarity
Stable6 years
Phosphorus
Stable-0.37 µg/L/yr6 years
Chlorophyll-a
Worsening+1.48 µg/L/yr6 years
EPA Impairment Status
Wassermann Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Aquatic life, Fish consumption, Recreation.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MN10-0048-00 · Official waterbody report
Nearby Lakes in Carver County
Frequently asked questions about Wassermann Lake
Where is Wassermann Lake?
- Wassermann Lake is a lake in Carver County, Minnesota. Its water-quality measurements are published by Minnesota PCA and shown on this page as reported.
What is the water quality of Wassermann Lake?
- Wassermann Lake in Carver County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 2.3 ft visibility. Phosphorus: 76 µg/L. Chlorophyll-a (algae): 48.1 µg/L.
Is Wassermann Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Wassermann Lake is listed impaired under Clean Water Act §303(d) (IR 5) for impaired biota (cause unknown), mercury, nutrients (phosphorus, nitrogen). Check local advisories before you swim.
What is the water temperature of Wassermann Lake?
- Wassermann Lake typically sits around 57°F at the surface in October, from 1,228 EPA Water Quality Portal field readings (2010–2025). That is a typical value for the month, not a live reading.
Can I fish at Wassermann Lake?
- Public access to Wassermann Lake is listed as yes on the lake record. Seasons, size and bag limits, and whether you need a license are set by Minnesota's fish and wildlife agency, so check its current regulations before you go.
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Where this data comes from
165 measurements from 1 monitoring station, 2020–2021. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA165 samples · 2020–2021
Analytical methods
- Field measurement/observation, generic method
- Phosphorus by Two Reagent Colorimetry
- 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
Impairment status from EPA ATTAINS 303(d) database