Twin Lake
Washington County, MinnesotaView mapDirections
Minnesota PCA publishes the water-quality measurements for Twin Lake. Here is what has been measured.
- Mesotrophic
- Limited data
Twin Lake in Washington County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 13 ft visibility. Phosphorus: 13 µg/L. Chlorophyll-a (algae): 2.8 µg/L.
Twin Lake is a mesotrophic lake in Washington County, Minnesota. Limited fish-species data available. No public access — the lake is private or restricted. Compared to the 74 other monitored lakes in Washington County, Twin Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2024-10-14. Methodology: how these readings are compared.
What Twin Lake is good for
From access and monitoring records, not editorial picks.
- Clear water13 ft of visibility
Swimming conditions
Readings onlyLimited data
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 Twin 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 Twin Lake
These are the measurements Minnesota PCA publishes for Twin Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Good clarity, visible to about 13 ft. Phosphorus 13 µg/L. Chlorophyll-a 2.8 µg/L. TSI 41.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 13ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 13µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 2.8µg/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. | 41 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Twin Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Twin Lake typically sits around 54°F at the surface in October. Summer average is about 62°F. Usually warmest in Aug (about 65°F) and coldest in Apr (about 44°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (44°F) to its warmest (65°F).
Typical surface water temperature by month, from 264 field readings (2010–2024) via the EPA Water Quality Portal. See the full Twin Lake water temperature breakdown →
Stays via Stay22
Stays near Twin Lake
Compare lakeside cabins, hotels, and vacation rentals near Twin Lake in Washington 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 Twin Lake
Prices for Oct 9–11, 4 adults. Change dates on the map below.
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Planning a whole trip? See where to stay at Minnesota’s top lakes →
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Fishing Twin Lake
Water Quality Trend: Stable
Based on 6 years of monitoring (2020–2025).
Water clarity
Stable6 years
Nearby Lakes in Washington County
Frequently asked questions about Twin Lake
Where is Twin Lake?
- Twin Lake is a lake in Washington County, Minnesota. Its water-quality measurements are published by Minnesota PCA and shown on this page as reported.
What is the water quality of Twin Lake?
- Twin Lake in Washington County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 13 ft visibility. Phosphorus: 13 µg/L. Chlorophyll-a (algae): 2.8 µg/L.
Is Twin 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 Twin Lake?
- Twin Lake typically sits around 54°F at the surface in October, from 264 EPA Water Quality Portal field readings (2010–2024). That is a typical value for the month, not a live reading.
Can I fish at Twin Lake?
- Public access to Twin Lake is listed as no on the lake record, so confirm before you make the trip. 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.
Explore Twin Lake across LakeQuality
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Fish species and best lakes in Washington County
Species activity outlook by water temperature and season
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Minnesota's cleanest lakes, ranked on agency measurements
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Where this data comes from
28 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
MNPCA28 samples · 2024
Analytical methods
- Field measurement/observation, generic method
- Phosphorus by Colorimetry
- Analysis of Chlorophyll in Periphyton and Plankton
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.