The operator shall have all pipes, containers and other equipment inspected to determine the condition of surfaces which come into contact with treated water. The inspections must be made as often as necessary to maintain the sanitary condition of those surfaces and to ensure that they are kept free of oxidation, scale and any other residue. The operator shall immediately correct any unsanitary condition and shall remove any scale, residue or oxidation by cleaning and sanitizing the affected surface before it is used again.
Nev. Admin. Code § 445A.581
NRS 439.200