Pennsylvania has 14 tailings dams, of which 2 carry a high hazard classification. Tailings dams contain waste material from mining operations — typically a slurry of finely ground rock left over after valuable minerals have been extracted.
| # | Dam | County | Height (ft) | Hazard | Condition | Year |
|---|---|---|---|---|---|---|
| 1 | Cornwall Tailings | Lebanon | 200 | High | Fair | 1961 |
| 2 | North Slurry Pond | Washington | 100 | Low | Not assessed | |
| 3 | Lehigh Coal & Navigation Co - #14 Plant | Schuylkill | 80 | Significant | Not assessed | |
| 4 | Pond No 1 | Chester | 71 | Low | Fair | 1970 |
| 5 | South Slurry Pond | Washington | 60 | Low | Not assessed | |
| 6 | Pond # 3 | Luzerne | 45 | Significant | Not assessed | |
| 7 | Sediment Pond in Pit | Susquehanna | 45 | Low | Not assessed | |
| 8 | Slurry Pond #2 | Indiana | 40 | Significant | Not assessed | |
| 9 | Sausman Tailings | Huntingdon | 39 | Significant | Not assessed | |
| 10 | Pond No 2 | Chester | 36 | Low | Poor | |
| 11 | Pond No 3 | Chester | 28 | Low | Fair | |
| 12 | Toland Mine | Cumberland | 28 | Low | Not assessed | 1981 |
| 13 | Reading Anthracite - Trevorton | Northumberland | 25 | High | Not assessed | |
| 14 | Pond C | Cumberland | 10 | Undetermined | Not assessed |