21 CFR § 1250.52
Discharge of wastes on highway conveyances
June 25, 2020
There shall be no discharge of excrement, garbage, or waste water from a highway conveyance except at servicing areas approved by the Commissioner of Food and Drugs.
[40 FR 5624, Feb. 6, 1975, as amended at 48 FR 11432, Mar. 18, 1983]