What is the cleanest lake near Harpt Lake?

Tuma Lake in Manitowoc County holds a Grade A water quality score and is 0.7 miles from Harpt Lake.

Why is Harpt Lake not Grade A?

Harpt Lake holds Grade B, with about 12.3 ft of water clarity and 44.2 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 Harpt Lake in Wisconsin, with strictly higher numeric grade scores and sufficient monitoring data.

Cleaner Lakes Than Harpt Lake, Top 4 Within 30 Miles, LakeQuality

Cleaner Lakes Than Harpt Lake

4 higher-graded lakes within 30 miles, ranked by grade improvement and proximity.

Harpt Lake carries a Grade B (Good) water quality score. Within 30 miles, 4 lakes hold a higher grade. Tuma Lake (Manitowoc County, Grade A, 0.7 mi away) is the closest meaningful upgrade.

Tuma Lake

Manitowoc County, Wisconsin · 0.7 mi from Harpt Lake

+Higher grade (B → A)
++20.5 ft water clarity
+Lower phosphorus (19 vs 44.2 µg/L)

Kasbaum Lake

Manitowoc County, Wisconsin · 16.3 mi from Harpt Lake

+Higher grade (B → A)
++19.7 ft water clarity
+Lower phosphorus (22.2 vs 44.2 µg/L)

English Lake

Manitowoc County, Wisconsin · 17.6 mi from Harpt Lake

+Higher grade (B → A)
++12.3 ft water clarity
+Lower phosphorus (26.7 vs 44.2 µg/L)

Hartlaub Lake

Manitowoc County, Wisconsin · 17.3 mi from Harpt Lake

+Higher overall water quality score
++4.1 ft water clarity
+Lower phosphorus (35.8 vs 44.2 µg/L)

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.