How Clean Is Hanska Lake?
Hanska Lake has very poor water quality and a high algae bloom risk. It received a water quality grade of F (Very Poor) based on EPA monitoring data. Water clarity (Secchi depth): 1 ft. Phosphorus: 218 µg/L. Chlorophyll-a (algae): 99.6 µg/L. Trophic State Index: 78.
Cleanliness Snapshot
| Metric | Hanska Lake | Minnesota avg |
|---|---|---|
| Overall Grade | F | C |
| Water Clarity (Secchi) | 1 ft | — |
| Phosphorus | 218 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 99.6 µg/L | <10 = clean |
| Trophic State Index | 78 | <50 = clean |
How does Hanska Lake compare?
Hanska Lake's grade of F falls below the Minnesota state average of C. It ranks #5 of 7 lakes in Brown County by water quality score. Multi-year monitoring data shows water quality is declining based on 4 years of records.