How Clean Is L. Ste. Louise Lake?
L. Ste. Louise Lake has poor water quality, with elevated phosphorus and algae. It received a water quality grade of D (Poor) based on EPA monitoring data. Water clarity (Secchi depth): 2.6 ft. Phosphorus: 40.8 µg/L. Chlorophyll-a (algae): 18.3 µg/L. Trophic State Index: 60.
Cleanliness Snapshot
| Metric | L. Ste. Louise Lake | Wisconsin avg |
|---|---|---|
| Overall Grade | D | C |
| Water Clarity (Secchi) | 2.6 ft | — |
| Phosphorus | 40.8 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 18.3 µg/L | <10 = clean |
| Trophic State Index | 60 | <50 = clean |
How does L. Ste. Louise Lake compare?
L. Ste. Louise Lake's grade of D falls below the Wisconsin state average of C. It ranks #2 of 11 lakes in St. Charles County by water quality score.