How Clean Is Sarah Lake?
Sarah 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): 3.1 ft. Phosphorus: 106.1 µg/L. Chlorophyll-a (algae): 34.3 µg/L. Trophic State Index: 66.
Cleanliness Snapshot
| Metric | Sarah Lake | Minnesota avg |
|---|---|---|
| Overall Grade | F | C |
| Water Clarity (Secchi) | 3.1 ft | — |
| Phosphorus | 106.1 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 34.3 µg/L | <10 = clean |
| Trophic State Index | 66 | <50 = clean |
How does Sarah Lake compare?
Sarah Lake's grade of F falls below the Minnesota state average of C. It ranks #73 of 81 lakes in Hennepin County by water quality score. Multi-year monitoring data shows water quality is declining based on 6 years of records.