52 Pa. Stat. § 631
From and after the passage of this act, it shall be unlawful for any person, partnership, or corporation to place or discharge, or permit to be placed or discharged, in or into any of the running streams of this State, any anthracite coal, anthracite culm, or refuse from anthracite coal-mine; or to deposit any such coal, or culm, or refuse upon the banks of such stream, where the same would be likely to slide into or be washed into such stream: Provided however, That this act shall not apply to waters pumped or flowing from coal-mines where the coal or culm, or refuse have been removed therefrom; or shall not prevent the discharge of sewerage from any public sewer-system, owned or maintained by any municipality in this Commonwealth.
52 P.S. § 631