Rule 33. A sewage treatment and disposal system other than septic tank-subsurface disposal systems shall be under the supervision of an operator certified pursuant to Act No. 245 of the Public Acts of 1929, as amended, being §323.1 et seq. of the Michigan Compiled Laws or Act No. 98 of the Public Acts of 1913, as amended, being §325.201 et seq. of the Michigan Compiled Laws.
Mich. Admin. Code R. 325.3333