53 Pa. Stat. § 39932
Whenever any city of the third class, with the assent of the electors thereof, has heretofore authorized, issued, and sold bonds or other obligations on the faith and credit of the city, for the purpose of extending, enlarging, and improving the water works of such city, and such extensions, enlargements, and improvements have been fully completed and are being used for the benefit of such city, and the inhabitants thereof, then such bonds or other obligations are hereby ratified, confirmed, and validated notwithstanding that, at the time such bonds were authorized, issued, and sold, no power was vested in such city to incur or increase its indebtedness for water works purposes other than for the original erection and completion thereof, and such bonds or other obligations are hereby made valid and binding obligations of such city to the same extent as if full power had been vested by law in such city to incur or increase its indebtedness for the extension, enlargement, and improvement of such water works.
53 P.S. § 39932