What is the cleanest lake near Lake Mary?

Powers Lake in Kenosha County holds a Grade A water quality score and is null miles from Lake Mary.

Why is Lake Mary not Grade A?

Lake Mary holds Grade B, with about 6.4 ft of water clarity and 15.5 µg/L of phosphorus. The letter is nutrients and algae against that lake’s EPA ecoregion classes. Clarity is shown separately. Cleaner alternatives nearby have a strictly higher nutrient-and-algae score.

Are these recommendations based on real data?

Yes. Every grade is calculated from EPA Water Quality Portal samples for the lake. Recommendations are limited to lakes within 30 miles of Lake Mary in Wisconsin, with strictly higher numeric grade scores and sufficient monitoring data.

Cleaner Lakes Than Lake Mary, Top 1 Within 30 Miles

Cleaner Lakes Than Lake Mary

1 higher-graded lake within 30 miles, ranked by grade improvement and proximity.

Lake Mary carries a Grade B (Good) water quality score. Within 30 miles, 1 lake holds a higher grade. Powers Lake (Kenosha County, Grade A, null mi away) is the closest meaningful upgrade.

Powers Lake

Kenosha County, Wisconsin · mi from Lake Mary

+Higher grade (B → A)
++3.6 ft water clarity

Reading the cohort

Just one nearby water body scores higher than Lake Mary on the EPA metrics within a 30-mile radius. The single cleaner option (below) is the practical alternative; beyond that, the next-cleanest lakes sit farther out and warrant a longer drive only if the water-quality difference is the deciding factor.

The closest cleaner alternative — Powers Lake in Kenosha County, Grade A — sits miles from Lake Mary. At that distance, the substitution cost is essentially zero: same drive time, same regional access, demonstrably cleaner water on the EPA indicators. For repeat visitors who care about clarity or phosphorus levels, swapping the routine to Powers Lake is mostly a habit change rather than a logistics change.

The EPA water-quality grading combines clarity (Secchi depth), phosphorus, and chlorophyll-a measurements from state environmental sampling. A higher letter grade reflects measurably cleaner water on those indicators, not subjective beauty or access quality — a Grade A lake might have worse boat-launch facilities or shoreline access than a Grade C neighbor, so the ranking is one input alongside the rest of trip planning. See the methodology page for the full grading formula.

How this list is built

Rated lakes on LakeQuality have a letter from EPA Water Quality Portal samples — nutrients and algae measured against EPA National Lakes Assessment ecoregion classes. Secchi is shown, not scored. To suggest cleaner alternatives, we filter lakes within 30 miles to those with a strictly higher numeric score, then rank by grade improvement with a small proximity tiebreak. Cross-state and limited-data lakes are excluded so the list stays locally relevant.