How Clean Is Thomas Lake?
Thomas 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): 14 ft. Trophic State Index: 39.
Cleanliness Snapshot
| Metric | Thomas Lake | Minnesota avg |
|---|---|---|
| Overall Grade | B | C |
| Water Clarity (Secchi) | 14 ft | — |
| Trophic State Index | 39 | <50 = clean |
How does Thomas Lake compare?
Thomas Lake's grade of B matches or beats the Minnesota state average of C. It ranks #42 of 142 lakes in Lake County by water quality score. Multi-year monitoring data shows water quality is stable based on 4 years of records.