53 Pa. Stat. § 11102
For the purpose of developing, adopting and implementing a comprehensive plan for the entire county or for any area within the county, the governing bodies of municipalities located within the county or counties may enter into intergovernmental cooperative agreements, as provided by 53 Pa.C.S. Ch. 23 Such. A (relating to intergovernmental cooperation), except for any provisions permitting initiative and referendum. Such agreements may also be entered into between and among counties and municipalities for areas that include municipalities in more than one county, and between and among counties, municipalities, authorities and special districts providing water and sewer facilities, transportation planning or other services within the area of a plan and with the opportunity for the active participation of State agencies and school districts. Implementation of the comprehensive plan and subdivision and zoning ordinances shall be accomplished in accordance with articles of this act.
53 P.S. § 11102