Chapter 105: your project is a water obstruction
DEP, or your county conservation district if it has Chapter 105 delegation
Under Pennsylvania's Chapter 105 rules, a "body of water" includes any natural or artificial lake or pond, and a "water obstruction" includes a pier, wharf, wall, fill or other structure in, along, across or projecting into it. For ponds and lakes, a structure counts if, at normal pool level, it is in the water or touching the water's edge. The rules cover temporary structures as well as permanent ones. DEP says any change to a pond's cross-section that is not maintenance, such as a new dock, pier or island or making the pond bigger, needs a water obstruction and encroachment permit.
Checked Oct 4, 2026 · Source: 25 Pa. Code § 105.1, Definitions This may be outdated