The water supply serving all plumbing fixtures, including drinking fountains, lavatories and showers, shall, after treatment, meet the provisions required for a public water system as defined in the State Sanitary Code (Subpart 5-1 of this Title). A spray ground with an on-site water supply that does not meet the definition of a public water system must comply with the standards established in Subpart 5-1 of this Title for a non-community water system.
N.Y. Comp. Codes R. & Regs. Tit. 10 §§ 6-3.12