The State Department of Resources submitted on April 18, 1977, a letter certifying that there are no existing phosphate fertilizer plants in the State subject to part 60, subpart B of this chapter.

On August 9, 2013, the Michigan Department of Environmental Quality submitted a negative declaration letter to EPA certifying that there are no existing Hospital/Medical/Infectious Waste Incinerators (HMIWI) units in the State of Michigan subject to the emissions guidelines at 40 CFR part 60, subpart Ce.

On September 21, 2015, Michigan submitted a State Plan for implementing the emission guidelines for Sewage Sludge Incinerators (SSI). The enforceable mechanism for this State Plan is a State rule codified in R 336.1972, “Emission standards for existing sewage sludge incineration units,” and R 336.1902 “Adoption of standards by reference.” The State's final rule became effective on May 20, 2015.

The Michigan State Plan for existing Sewage Sludge Incinerators (SSI) applies to all SSIs for which construction commenced on or before October 14, 2010 or for which a modification was commenced on or before September 21, 2011 primarily to comply with this rule.

The Federal effective date of the Michigan State Plan for existing Sewage Sludge Incinerators is January 15, 2016.

On July 27,2015, the Michigan Department of Environmental Quality submitted a negative declaration letter to EPA certifying that there are no existing Small Municipal Waste Combustors (SMWC) units in the State of Michigan subject to the emissions guidelines at 40 CFR part 60, subpart BBBB.