1. The maximum water depth for a public spa is 4 feet (1.22 m), measured from the waterline. Exceptions may be made by the health authority for spas designed for special purposes such as instruction, treatment and therapy.2. The maximum depth for any seat or sitting bench in a public spa is 2 feet (61 cm) measured from the waterline.Nev. Admin. Code § 444.432
Bd. of Health, Public Spa Reg. Art. 11 §§ 11.2 & 11.3, eff. 11-27-79