ARM 37.115.1912. WHEN LICENSE NOT REQUIRED

(1) Licenses are not required for the following: (a) natural or recreational bodies of water; (b) swimming pools located on private property, including owner-occupied condominium developments, and which are used for swimming or bathing only by the owner, members of the owner's family, or their invited guests; (c) hot water baths for single use; (d) a pool or spa at a tourist home, if it is not used by the parties renting or leasing the home or if it is completely drained, cleaned, and refilled between guests; (e) spa pools in individual hotel or motel rooms or in individual cabins that are completely drained, cleaned, and refilled between patron use; and (f) pools or spas at condominium units that are leased for periods of one month or greater.