The dry earth system: why our modern flush toilets won a historical war

Science · Published 20 October 2026 Swipe more like this →

In short: Before the roar of sewers dominated urban life, an English clergyman proposed a revolution in sanitation. He didn't want to wash waste away; he wanted to manage it. His 'dry earth system' was designed to be economical and safe, yet it lost out to the water-flushed toilet.

In the mid-19th century, English clergyman Henry Moule witnessed devastating cholera epidemics in 1849 and 1854. Horrified by the unsanitary conditions of urban housing—culminating in the 'Great Stink' of 1858—he developed the 'dry earth system.' Unlike modern flush toilets that move waste via water, Moule’s design focused on dry disposal. He patented his device with James Bannehr on May 28, 1860, and spent years publishing works advocating for its health and economic benefits across Britain and the British Raj.

The system was versatile, finding use in private homes, military camps, and hospitals. However, as public attention shifted toward water-flushed toilets connected to sewer systems, Moule's dry earth closets failed to gain widespread support. While flush toilets became the standard for modern infrastructure, dry toilets persisted in specific contexts: rural areas of developed countries like Scandinavia (Sweden, Finland, Norway), regions with severe water scarcity such as Lima, Peru, and developing nations where high sewerage costs make sewers impractical.

Today, 'dry toilet' is a broad term that can refer only to the user interface or include entire storage and treatment systems. Modern iterations range from simple bucket toilets using sawdust or lime to complex incinerating and freezing models requiring electricity. These systems are increasingly valued for their ability to prevent groundwater pollution and enable the safe reuse of excreta as fertilizer through composting, offering a flexible alternative to the rigid requirements of sewer-based infrastructure.

A notable nuance exists in terminology: while 'dry toilet' implies no water use, some pit latrines are not actually dry because urine mixes with feces or surface water enters the pit. Furthermore, while simple pit latrines can be difficult to empty safely, contemporary container-based and composting toilets are designed for frequent, safe emptying within days, weeks, or months.

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