Those facilities in operation on November 21, 1970, must obtain a permit. All sanitary requirements must be followed, but the health authority may waive deficiencies in existing structures. After November 21, 1970, construction or major alterations must comply fully with NAC 444.5461 to 444.54675, inclusive, regarding construction or alteration.
Nev. Admin. Code § 444.54625
NRS 439.200