How Clean Is Fon-du-Lac Reservoir?
Fon-du-Lac Reservoir 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): 1.3 ft. Phosphorus: 81 µg/L. Chlorophyll-a (algae): 40.7 µg/L. Trophic State Index: 69.
Cleanliness Snapshot
| Metric | Fon-du-Lac Reservoir | Wisconsin avg |
|---|---|---|
| Overall Grade | F | C |
| Water Clarity (Secchi) | 1.3 ft | — |
| Phosphorus | 81 µg/L | <30 = clean |
| Chlorophyll-a (Algae) | 40.7 µg/L | <10 = clean |
| Trophic State Index | 69 | <50 = clean |
How does Fon-du-Lac Reservoir compare?
Fon-du-Lac Reservoir's grade of F falls below the Wisconsin state average of C. It ranks #7 of 7 lakes in Jefferson County by water quality score.