Mich. Comp. Laws § 41.350b
In a township where there are lands serviced by a water system financed by revenue bonds issued under the revenue bond act of 1933, Act No. 94 of the Public Acts of 1933, being sections 141.101 to 141.140 of the Michigan Compiled Laws, or by bonds issued under the county public improvement act of 1939, Act No. 342 of the Public Acts of 1939, being sections 46.171 to 46.188 of the Michigan Compiled Laws; Act No. 185 of the Public Acts of 1957, being sections 123.731 to 123.786 of the Michigan Compiled Laws; or Act No. 233 of the Public Acts of 1955, being sections 124.281 to 124.294 of the Michigan Compiled Laws, having water service available for fire protection through fire hydrants and water mains, the township board may determine by resolution that the reasonable cost and value of the water service for fire protection within the district served by the water system shall be borne by a special assessment levied annually, while bonds are outstanding, against all of the real property located within the district, which shall constitute a special assessment district. A special assessment under this section shall not be levied against any property in 1 year in excess of 1/5 of 1% of the state equalized valuation of the property unless a special hearing is held.
MCL 41.350b