How Clean Is Coon Lake?
Coon Lake has fair water quality — typical of lakes with moderate nutrient enrichment. It received a water quality grade of C (Fair) based on EPA monitoring data. Water clarity (Secchi depth): 5.6 ft. Phosphorus: 23 µg/L. Chlorophyll-a (algae): 7.9 µg/L. Trophic State Index: 51.
Cleanliness Snapshot
| Metric | Coon Lake | Minnesota avg |
|---|---|---|
| Overall Grade | C | C |
| Water Clarity (Secchi) | 5.6 ft | — |
| Phosphorus | 23 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 7.9 µg/L | <10 = clean |
| Trophic State Index | 51 | <50 = clean |
How does Coon Lake compare?
Coon Lake's grade of C matches or beats the Minnesota state average of C. It ranks #8 of 24 lakes in Anoka County by water quality score. Multi-year monitoring data shows water quality is improving based on 5 years of records.