(a) General rule.--A city with a sanitary sewer system may extend the system and construct sewers beyond the city's boundaries into adjoining municipalities in the county where the city is located and furnish sewer facilities to, and permit the tapping and the connection with the sewer facilities by, any person and municipality in the county where the city is located in accordance with law and the rules and regulations of the Pennsylvania Public Utility Commission.

(b) Limitation.--This section does not authorize a city to extend a sewerage system or construct sewers in territory outside the boundaries of the cities in which sewerage facilities are furnished by a private company or by a municipality authority.