Minnetoga Lake
Minnetoga Lake in Hennepin County, Minnesota has a water quality grade of C (Fair). Water clarity: 4.4 ft visibility. Phosphorus: 36.5 µg/L. Chlorophyll-a (algae): 9.7 µg/L. Maximum depth: 27 ft. Surface area: 15.1 acres.
- Clarity
- 4.4 ft
- Typical in August
- 78°F
- Max depth
- 27 ft
- Area
- 15 acres
- Type
- Eutrophic
- Public access
- No
Next lake in Hennepin County
Minnetoga Lake is a 15-acre productive, nutrient-rich eutrophic lake in Hennepin County, Minnesota with a maximum depth of 27 feet. Water quality is graded C based on 2 sampling years through 2024. Limited fish-species data available. No public access — the lake is private or restricted. Compared to the 80 other monitored lakes in Hennepin County, Minnetoga Lake ranks #23 for water quality.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2024-10-20. Grade methodology: LakeGrade methodology.
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Swimming Safety
Grade onlyLimited data
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.
Generally safe for swimming, moderate water quality
Water Quality Grade: C (Fair)
Murky, only visible to about 4.4 ft. Phosphorus level: 36.5 µg/L. Chlorophyll-a: 9.7 µg/L. Trophic State Index: 55.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.4 ft | Not graded |
| Phosphorus | 36.5 µg/L | Fair |
| Chlorophyll-a (Algae) | 9.7 µg/L | Fair |
| Trophic State Index (TSI) | 55 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Minnetoga Lake
Compare lakeside cabins, hotels, and vacation rentals near Minnetoga Lake in Hennepin 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.
Top-rated places to stay near Minnetoga Lake
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Water Temperature
Minnetoga Lake typically sits around 78°F at the surface in August. Summer average is about 76°F. Usually warmest in Jul (about 79°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 40 field readings (2010–2024) via the EPA Water Quality Portal. See the full Minnetoga Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 27 ft |
| Surface Area | 15 acres |
| Shoreline Length | 0.8 mi |
| Littoral Zone | 7% |
| Public Access | No |
Fishing Minnetoga Lake
EPA Impairment Status
Minnetoga Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MN27-0091-00 · Official waterbody report · Matched by proximity (2.68 km)
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Minnetoga Lake under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Veolia Wts Solutions Usa IncMinnetonka · 1 mi away · NPDES MN0059013Recent 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.
County Ranking
Ranked #23 of 81 lakes in Hennepin County
Nearby Lakes in Hennepin County
Frequently asked questions about Minnetoga Lake
What is the water quality grade for Minnetoga Lake?
- Minnetoga Lake in Hennepin County, Minnesota has a water quality grade of C (Fair). Water clarity: 4.4 ft visibility. Phosphorus: 36.5 µg/L. Chlorophyll-a (algae): 9.7 µg/L. Maximum depth: 27 ft. Surface area: 15.1 acres.
Is Minnetoga Lake safe to swim in?
- Generally safe for swimming, moderate water quality. Minnetoga Lake has a water quality grade of C (Fair). Algae concentration (chlorophyll-a) is 9.7 µg/L. Always check local health department advisories before swimming.
What is the water temperature of Minnetoga Lake?
- Minnetoga Lake typically sits around 78°F at the surface in August, from 40 EPA Water Quality Portal field readings (2010–2024). That is a typical value for the month, not a live reading.
How deep is Minnetoga Lake?
- Minnetoga Lake has a maximum depth of 27 feet. The lake covers 15.1 acres.
Explore Minnetoga Lake across LakeGrade
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High nutrients, frequent algae, reduced clarity
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Where this data comes from
56 measurements from 1 monitoring station, 2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA56 samples · 2024
Analytical methods
- Field measurement/observation, generic method
- Phosphorus by Colorimetry
- Analysis of Chlorophyll in Periphyton and Plankton
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 details from Minnesota DNR LakeFinder