How Clean Is Hammal Lake?
Hammal Lake is a clean lake by Minnesota standards. It received a water quality grade of B (Good) based on EPA monitoring data. Water clarity (Secchi depth): 12 ft. Trophic State Index: 41.
Cleanliness Snapshot
| Metric | Hammal Lake | Minnesota avg |
|---|---|---|
| Overall Grade | B | C |
| Water Clarity (Secchi) | 12 ft | — |
| Trophic State Index | 41 | <50 = clean |
How does Hammal Lake compare?
Hammal Lake's grade of B matches or beats the Minnesota state average of C. It ranks #20 of 53 lakes in Aitkin County by water quality score. Multi-year monitoring data shows water quality is declining based on 5 years of records.