How Clean Is Big Lake?
Big Lake does not have enough monitoring data to grade. Its EPA monitoring record does not meet the evidence bar for a letter grade, so it is published unrated — that is an absence of evidence, not a poor result. The measurements below are what the record does contain. Water clarity (Secchi depth): 7 ft. Trophic State Index: 49.
Cleanliness Snapshot
| Metric | Big Lake | Wisconsin avg |
|---|---|---|
| Overall Grade | NR | B |
| Water Clarity (Secchi) | 7 ft | — |
| Trophic State Index | 49 | <50 = clean |
How does Big Lake compare?
Big Lake is not rated for water quality — its monitoring record does not meet the evidence bar, so it is not compared with the Wisconsin state average. Multi-year monitoring data shows water quality is improving based on 4 years of records.