32 Pa. Stat. § 815.34
The Department of Health, or such other agency designated by the law of the respective signatory states to deal with control or abatement of pollution, is hereby authorized and directed to cooperate with said Interstate Commission on the Delaware River Basin in the further study of the sanitary condition of the waters of Delaware River, and its tributaries, in said Delaware River Basin and to approve, adopt and enforce within this state, such reasonable modifications, changes or alterations in the zones or standards of quality of water in said river and tributaries, as may from time to time be recommended by said Interstate Commission on the Delaware River Basin, and approved by the departments of health of the other states constituent to said Delaware River Basin.
32 P.S. § 815.34