36 CFR 3.13 - What conditions apply to the use of Marine Sanitation Devices (MSD)?
(a) Discharging sewage from any vessel, whether treated or not, in any body of fresh water is prohibited.
(b) The owner or operator of any vessel on park fresh water that is equipped with toilet facilities and/or a MSD that is capable of discharge, must lock or otherwise secure the valves or mechanism of the device. Acceptable methods of securing the device include:
Title 36 published on 2013-07-01
no entries appear in the Federal Register after this date.