Waterless toilet

A dry toilet is a toilet that operates without flush water, unlike a flush toilet. The dry toilet may be a raised pedestal on which the user can sit, or a squat pan over which the user squats in the case of a squat toilet. In both cases, the excreta (both urine and feces) falls through a drop hole. The urine and feces can either become mixed at the point of dropping or stay separated, which is called urine diversion.

A dry toilet can be any of the following types of toilets: a composting toilet, urine-diverting dry toilet, Arborloo, container-based toilet, bucket toilet, pit latrine (except for pour flush pit latrines), incinerating toilets, or freezing toilets.

There are several types of toilets which are referred to as "dry toilets". All of them work without flush water and without a connection to a sewer system or septic tank:

Further dry toilets are under development at universities, for example since 2012 funded by the Bill and Melinda Gates Foundation. Such toilets are meant to operate off-the-grid without connections to water, sewer, or electrical lines.

People mean different things when they talk about a "dry toilet". Often, the term "dry toilet" is used for a composting toilet, but sometimes also for a pit latrine. Calling a pit latrine a dry toilet is not good practice because:

The term "outhouse" refers to a small structure, separate from a main building, which covers a pit toilet or a dry toilet. Although it strictly refers only to the structure above the toilet, it is often used to denote the entire toilet structure, i.e. including the hole in the ground in the case of a pit latrine.

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