How Clean Is Crystal Lake?
Crystal 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): 1.5 ft. Phosphorus: 172 µg/L. Trophic State Index: 75.
Cleanliness Snapshot
| Metric | Crystal Lake | Minnesota avg |
|---|---|---|
| Overall Grade | F | C |
| Water Clarity (Secchi) | 1.5 ft | — |
| Phosphorus | 172 µg/L | <30 = clean |
| Trophic State Index | 75 | <50 = clean |
How does Crystal Lake compare?
Crystal Lake's grade of F falls below the Minnesota state average of C. It ranks #7 of 9 lakes in Blue Earth County by water quality score. Multi-year monitoring data shows water quality is declining based on 4 years of records.