How Clean Is Tappan Lake?
Tappan Lake has poor water quality, with elevated phosphorus and algae. It received a water quality grade of D (Poor) based on EPA monitoring data. Phosphorus: 77 µg/L. Trophic State Index: 67.
Cleanliness Snapshot
| Metric | Tappan Lake | Wisconsin avg |
|---|---|---|
| Overall Grade | D | D |
| Phosphorus | 77 µg/L | <30 = clean |
| Trophic State Index | 67 | <50 = clean |
How does Tappan Lake compare?
Tappan Lake's grade of D matches or beats the Wisconsin state average of D. It ranks #1 of 2 lakes in Harrison County by water quality score.