Aka Groffdale Mill
| c1735 | Hans Graaf (Groff) |
| 1738 | Peter Groff |
| 1765 | Peter Groff, Jr. |
| 1772 | Magdalena Groff |
| c1793 | Abraham Groff |
| 1801 | Abraham Groff built current mill |
| c1809 | Martin & Magdalena (Groff) Schaeffer |
| 1835 | Abraham Groff |
| 1883 | George W. Martin |
| 1890 | Henry M. Weaver |
| 1918 | Martin M. Weaver |
| 1978 | Ervin N. Weaver |
| 2007 | MM Weaver & Sons, Inc. |
| 2022 | Weaver Properties, Inc. |
On January 29, 1895, this mill was the location of a meeting with Bishop Jonas Martin and interested neighbors to discuss the formation of the Old Order Mennonite Church.
The mill is located at 169 North Groffdale Road, Leola, PA.
| Built | c1801 |
| Structure | 2.5 Story Stone 30×40 |
| Water Source | Groff’s Run |
| Township | West Earl |
| Type | Flour/Grist/Saw |
| Headrace | 1,000 feet |
| Tailrace | 50 feet |
| Power | 1 Overshot |
| Capacity | 8 bbl / day |