How Clean Is Rock Lake?
Rock Lake is a clean lake by Wisconsin standards. It received a water quality grade of B (Good) based on EPA monitoring data. Water clarity (Secchi depth): 12 ft. Phosphorus: 18.1 µg/L. Trophic State Index: 44.
Cleanliness Snapshot
| Metric | Rock Lake | Wisconsin avg |
|---|---|---|
| Overall Grade | B | B |
| Water Clarity (Secchi) | 12 ft | — |
| Phosphorus | 18.1 µg/L | <30 = clean |
| Trophic State Index | 44 | <50 = clean |
How does Rock Lake compare?
Rock Lake's grade of B matches or beats the Wisconsin state average of B. It ranks #1 of 7 lakes in Jefferson County by water quality score. Multi-year monitoring data shows water quality is improving based on 7 years of records.
Watch Rock Lake water quality
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