How Clean Is Green Lake?
Green Lake has fair water quality — typical of lakes with moderate nutrient enrichment. Its nutrient and algae readings come from EPA monitoring data. Water clarity (Secchi depth): 6 ft. Phosphorus: 23 µg/L. Chlorophyll-a (algae): 8.4 µg/L. Trophic State Index: 51.
Cleanliness Snapshot
| Metric | Green Lake | Minnesota avg |
|---|---|---|
| Water Clarity (Secchi) | 6 ft | — |
| Phosphorus | 23 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 8.4 µg/L | <10 = clean |
| Trophic State Index | 51 | <50 = clean |
How does Green Lake compare?
Green Lake's readings match or beat the Minnesota state average. It ranks #13 of 30 lakes in Chisago County by water quality score. Multi-year monitoring data shows water quality is improving based on 6 years of records.
Watch Green Lake water quality
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