What is the cleanest lake near Chisago Lake?

School Lake in Chisago County holds a Grade B water quality score and is 2.5 miles from Chisago Lake.

Why is Chisago Lake not Grade A?

Chisago Lake holds Grade C, with about 4 ft of water clarity and 32 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 Chisago Lake in Minnesota, with strictly higher numeric grade scores and sufficient monitoring data.

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

Cleaner Lakes Than Chisago Lake

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

Chisago Lake carries a Grade C (Fair) water quality score. Within 30 miles, 4 lakes hold a higher grade. School Lake (Chisago County, Grade B, 2.5 mi away) is the closest meaningful upgrade.

School Lake

Chisago County, Minnesota · 2.5 mi from Chisago Lake

+Higher grade (C → B)
++3.9 ft water clarity
+Lower phosphorus (20 vs 32 µg/L)

South Lindstrom Lake

Chisago County, Minnesota · 2.4 mi from Chisago Lake

+Higher grade (C → B)
++1.2 ft water clarity

Green Lake

Chisago County, Minnesota · 1.2 mi from Chisago Lake

+Higher overall water quality score
++2 ft water clarity
+Lower phosphorus (26 vs 32 µg/L)

Kroon Lake

Chisago County, Minnesota · 1.3 mi from Chisago Lake

+Higher overall water quality score
++1.9 ft water clarity
+Lower phosphorus (23 vs 32 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.