D.C. Mun. Regs. tit. 14, r. 14-1111
All food and drink shall be stored and displayed so as to be protected from dust, rodents, flies, vermin, handling, droplet infection, overhead leakage and other contamination.
All food in sleeping rooms shall be kept in vermin-proof containers.
The containers in which flour, sugar, and similar food products are dispensed in daily usage shall be provided with tight-fitting tops and shall be so constructed as to protect the contents from dust, dirt, insects, and other contamination.
Sugar served to the public in boarding houses shall be dispensed from screw top or other type containers which provide protection from dirt, dust, other contamination and human handling, at all times, except in the case of lump sugar that is individually wrapped.
D.C. Mun. Regs. tit. 14, r. 14-1111