9 C.F.R. § 3.130 Watering.
Title 9 - Animals and Animal Products
If potable water is not accessible to the animals at all times, it must be provided as often as necessary for the health and comfort of the animal. Frequency of watering shall consider age, species, condition, size, and type of the animal. All water receptacles shall be kept clean and sanitary.
Title 9: Animals and Animal Products
PART 3—STANDARDS
Subpart F—Specifications for the Humane Handling, Care, Treatment, and Transportation of Warmblooded Animals Other Than Dogs, Cats, Rabbits, Hamsters, Guinea Pigs, Nonhuman Primates, and Marine Mammals
Animal Health and Husbandry Standards
§ 3.130 Watering.
