(1) The purpose of this subchapter, taken together with subchapters 11, 12, and 14, is to establish and implement one common system for issuing permits for point sources discharging pollutants into state waters, and is intended to allow the board and department to administer a pollutant discharge permit system which is compatible with the national pollutant discharge elimination system as established by the U.S. Environmental Protection Agency pursuant to section 402 of the federal Clean Water Act, 33 USC 1251, et seq.