N.Y. Comp. Codes R. & Regs. tit. 21 § 9003.22
No person shall use any water fountain, drinking fountain, pool, sprinklers, or any other water contained in or adjacent to any park for the purpose of washing or cleaning himself or herself, his or her clothing or other personal belongings. This section shall not apply to those areas within the parks which are specifically designated for personal hygiene purposes (i.e., bathrooms, shower rooms, or similar facilities), provided, however, that no person shall wash his or her clothes or personal belongings in such area, nor shall any person who has not been using a facility under the jurisdiction of ParksCorp for recreational purposes be permitted to use such an area within such facility for personal hygiene purposes.
N.Y. Comp. Codes R. & Regs. Tit. 21 § 9003.22