Lake Water Quality Blog
Data-driven articles on lake water quality, swimming safety, and what the science says about your favorite lakes in Minnesota and Wisconsin.
April 7, 2026
Best Lakes for Swimming in Minnesota & Wisconsin (2026)
The top 15 lakes with the best water quality grades for safe swimming. Ranked by clarity, phosphorus levels, and algae risk using EPA monitoring data.
April 7, 2026
Lake Water Quality Grades Explained: What A-F Means
How we grade every lake from A to F using secchi depth, phosphorus, and chlorophyll-a measurements. Understand what each grade means for swimming and recreation.
April 7, 2026
Lakes with the Worst Water Quality in the Midwest (2026)
The 15 lakes with the lowest water quality grades in Minnesota and Wisconsin. What causes poor grades and what it means for lake health.