D.C. Mun. Regs. tit. 25, r. 25-J323
The animal house shall be kept in good condition, clean and sanitary, and provide proper lighting, ventilation, and heating.
The floors of the animal house shall be of waterproof cement, quarry tile, or terrazzo.
The floors shall be smooth and properly drained, so they will dry quickly.
Floors shall be cleansed daily, using a cleansing agent, by hosing or wet mopping.
Proper lighting of the animal quarters is essential, and may be furnished by natural or artificial means.
When the lighting is natural, a means shall be provided to control the amount of sunlight entering during warm seasons of the year to prevent over-heating of the animal rooms.
Proper ventilation is essential and may be provided by the following methods:
When outside windows are opened, they shall be properly screened to prevent flies and other insect pests from entering.
Outside doors shall be screened.
Facilities for maintaining the proper temperature control suitable to the species of animals housed shall be installed and kept in a satisfactory operating condition.
Unless exercise interferes with the purpose of the study, each large animal shall be given an opportunity to exercise outside of the cage daily.
Outside runways are desirable when weather and climate permit.
When, in the opinion of the Director, outside runways cannot be reasonably provided, inside exercise areas may be used.
The floors of all runways shall be smooth and made waterproof by concrete or tile properly drained, and shall be kept in a clean sanitary condition.
When dogs are confined in cages, they shall be caged individually.
Animal cages shall be of a type approved by the Director, and shall be of sufficient size to permit the animal to turn about freely and to stand and lie in a natural position.
Animal cages shall be of non-rusting metal, or shall be treated to prevent rust.
Animal cages shall be constructed to facilitate cleaning, and shall be kept in good condition.
The floor of an animal cage may be of perforated metal, or of a special type of screen.
Cages shall be kept clean and, after they are vacated and before they are reoccupied, shall be thoroughly cleansed and disinfected in a manner approved by the Director.
Cages shall be spaced at least six inches (6") from the walls or partitions.
The space between the cages and the walls shall be kept clean.
Cages for dogs shall not be more than two (2) tiers high, and the lower tier shall be adequately protected from the excreta from the upper tier.
All cages and animals in the cages shall be plainly marked, showing the name of the department and the staff member who is in charge of the experiment.
Food and water dishes shall be thoroughly washed daily and, if interchanged with animals in other cages, shall be sanitized.
Unless contra-indicated by the experiments, water shall be available to the animals at all times.
The food given the animals shall be wholesome and of sufficient quantity for the type of animal and the scientific test.
When the animals are quartered in outdoor kennels, the following shall be provided:
D.C. Mun. Regs. tit. 25, r. 25-J323