53 Pa. Stat. § 4664
The department or board or bureau of health shall thereupon notify the owner or agent of any such building of the changes which are necessary to be made in said plumbing or drainage. Said changes shall be made within the time fixed by the department or board or bureau of health; and, upon refusal or neglect to obey such orders, the department or board or bureau of health shall institute legal proceedings to have such changes made and said nuisance abated, by action before a justice of the peace or court of record; in which said action the owner or agent of said building may show in defense, that the plumbing or drainage was not a nuisance, or was not of faulty construction or out of repair, and, in case of a building constructed subsequent to the passage of this act, said plumbing or drainage was not contrary to the provisions and requirements of this act or the ordinances of the city.
53 P.S. § 4664