8 Pa. C.S. § 2411
A borough desiring to build a water system or to improve its water supply may appropriate springs, streams, rivers or creeks and lands, easements and rights-of-way, within or without its limits. If the appropriation is outside its limits, the appropriation shall be in compliance with 26 Pa.C.S. § 206 (relating to extraterritorial takings). For the purpose of conducting water obtained outside its limits, a borough may lay pipes under and over any lands, rivers, streams, bridges, highways and under railroads. No water appropriated under this section shall be used in a manner as to deprive the owner of the water of the free use and enjoyment of the water for domestic or farm purposes. The exercise of the powers in this section shall be subject to any required approvals or permits from the Department of Environmental Protection or other Federal or State entity.
8 Pa.C.S. § 2411