Mich. Admin. Code R. 323.2153
Rule 2153. A facility, building, installation, or industry which discharges a point source discharge subject to a national permit and which is so constructed after October 18, 1972, to meet all applicable effluent standards of performance as required by the federal act, part 31 of the act, or these rules, shall not be subject to any more stringent standard of performance for any wastewater constituent during a 10-year period beginning on the date of completion of construction, or during the period of depreciation or amortization of the facility for the purposes of section 167, or 169, or both, of the internal revenue code of 1954, 26 U.S.C. §167 or 169, whichever period ends first, unless reallocation of effluent loads are necessitated in a discharge complex to meet water quality standards.
Mich. Admin. Code R. 323.2153