What is the cleanest lake near Martha Lake?

Charlotte Lake in Wright County holds a Grade A water quality score and is 0.7 miles from Martha Lake.

Why is Martha Lake not Grade A?

Martha Lake holds Grade D, with about 3 ft of water clarity and 75 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 Martha Lake in Minnesota, with strictly higher numeric grade scores and sufficient monitoring data.

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

Cleaner Lakes Than Martha Lake

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

Martha Lake carries a Grade D (Poor) water quality score. Within 30 miles, 4 lakes hold a higher grade. Charlotte Lake (Wright County, Grade A, 0.7 mi away) is the closest meaningful upgrade.

Charlotte Lake

Wright County, Minnesota · 0.7 mi from Martha Lake

+Two grade letters higher (D → A)
++14.1 ft water clarity
+Lower phosphorus (12.5 vs 75 µg/L)

Beebe Lake

Wright County, Minnesota · 2.2 mi from Martha Lake

+Higher grade (D → C)
++1.6 ft water clarity
+Lower phosphorus (35.5 vs 75 µg/L)

Rebecca Lake

Hennepin County, Minnesota · 5.3 mi from Martha Lake

+Higher grade (D → C)
++1.4 ft water clarity
+Lower phosphorus (44.9 vs 75 µg/L)

Schwappauf Lake

Hennepin County, Minnesota · 3.6 mi from Martha Lake

+Higher overall water quality score
++1.4 ft water clarity
+Lower phosphorus (65.1 vs 75 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.