What is the cleanest lake near Sand Hill Lake?

Spring Lake in Polk County holds a Grade A water quality score and is null miles from Sand Hill Lake.

Why is Sand Hill Lake not Grade A?

Sand Hill Lake holds Grade C, with about 6.9 ft of water clarity and 26 µg/L of phosphorus. The grade reflects measured water quality against Metropolitan Council thresholds. Cleaner alternatives nearby score higher on clarity, phosphorus, or chlorophyll-a.

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 Sand Hill Lake in Minnesota, with strictly higher numeric grade scores and sufficient monitoring data.

Cleaner Lakes Than Sand Hill Lake, Top 1 Within 30 Miles

Cleaner Lakes Than Sand Hill Lake

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

Sand Hill Lake carries a Grade C (Fair) water quality score. Within 30 miles, 1 lake holds a higher grade. Spring Lake (Polk County, Grade A, null mi away) is the closest meaningful upgrade.

Spring Lake

Polk County, Minnesota · mi from Sand Hill Lake

+Two grade letters higher (C → A)

Reading the cohort

Just one nearby water body scores higher than Sand Hill Lake 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 — Spring Lake in Polk County, Grade A — sits miles from Sand Hill Lake. 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 Spring 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

Every lake on LakeQuality has a calculated grade from EPA Water Quality Portal samples — secchi depth, total phosphorus, and chlorophyll-a measured against Metropolitan Council thresholds. 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.