How much water does a marine toilet use?
Emily Cortez
Updated on February 24, 2026
Water usage for marine toilets can generally range from 0.4 liters to 3.5 liters per use, depending on the model and the complexity of the system. The most economical marine toilets are simple cassette toilets and VacuFlush systems. Alternatively, compostable and incineration toilets use zero water to process waste.