53 Pa. Stat. § 2231
Whenever any county, city, borough, incorporated town, or township, either singly or jointly with other municipalities or townships, (a) has, wholly or partially, constructed or completed or shall hereafter, wholly or partially, construct or complete any sewer, sewerage system or sewage treatment works, either wholly or partially at public expense, or (b) has acquired or shall hereafter acquire the same, either wholly or partially at public expense, or (c) has entered or shall hereafter enter into any contract with any authority established in accordance with law or with any private corporation for the design or construction of sewers, sewerage systems or sewage treatment works or for the furnishing of sewer, sewerage or sewage treatment services, for its or their benefit and the benefit of the inhabitants thereof, such county, city, borough, incorporated town, or township may provide by ordinance or resolution, enacted either before or after the acquisition or construction thereof, or the entry into such contract, for the imposition and collection of an annual rental, rate or charge for the use of such sewer, sewerage system, or sewage treatment works from the owners of, or the users of water in or on the property served or to be served by it, or from both the owner and the water user, whether such property is located within or without the corporate limits of such county, city, borough, town, or township.
The annual rental, rate or charge so imposed shall be a lien on the properties served, and such liens may be filed in the office of the prothonotary and collected in the manner provided by law for the filing and collection of municipal claims.
53 P.S. § 2231