43 Pa. Stat. § 1
Every person, firm, or corporation, being the owner or lessee of any foundry for the casting of iron, steel, brass, or other metal, or any rolling mill, boiling mill, heating mill, or finishing mill, wherein ten or more men shall be employed, shall cause to be established and maintained, in a place conveniently accessible and connected with said foundry, rolling mill, boiling mill, heating mill, or finishing mill, in such a manner that access thereto can be had without exposure to the open air, a toilet-room of suitable size, wherein said employes may change their clothes. Such toilet-room shall be provided with wash-bowls, sinks, or other suitable fixed appliances, duly connected and supplied with running hot and cold water. There shall also be established and maintained, separate from said toilet-room, a suitable water-closet. It shall be the duty of the Factory Inspector or his duly authorized agent to enforce the provisions of this act. For that purpose, the Factory Inspector or his duly authorized agent may enter, at any reasonable time, any foundry, rolling mill, boiling mill, heating mill, or finishing mill, for the purpose of inspecting the same to ascertain whether the provisions of this act have been complied with.
43 P.S. § 1