Michigan Compiled Laws, Chapter 333. Health § 333.12521

(a) “Department” means the department of environment, Great Lakes, and energy.

(b) “Person” means that term as defined in section 1106  2 or a governmental entity.

(c)Except as otherwise provided in subdivision (d), “public swimming pool” means an artificial body of water for a qualified premises that is used collectively by a number of individuals primarily for the purpose of swimming, wading, recreation, or instruction and includes related equipment, structures, areas, and enclosures intended for the use of individuals using or operating the swimming pool, including, but not limited to, equipment, dressing, locker, shower, and toilet rooms.

(d)Public swimming pool does not include a pool or portable pool located on the same premises with a 1-, 2-, 3-, or 4-family dwelling and for the benefit of the occupants and their guests, a natural bathing area such as a stream, lake, river, or man-made lake or pond that uses water from natural sources and has an inflow and outflow of natural water, an exhibitor's swimming pool built as a model at the site of the seller and in which swimming by the public is not permitted, or a pool serving not more than 4 hotel, motel, apartment, condominium, or similar units.

(e) “Qualified premises” includes, but is not limited to, a park, school, motel, camp, resort, apartment, club, hotel, mobile home park, subdivision, and waterpark.