History of water supply and sanitation

The history of water supply and sanitation traces how societies built systems to obtain, distribute, and treat water and to collect and manage human waste.

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Roman aqueducts: Masonry channels and related structures that carried water from distant sources to Roman cities. Their large-scale gravity-fed networks became a defining ancient approach to urban water supply.
Aqueduct: A structure or channel that conveys water from one place to another, often by gravity. Aqueducts made distant sources usable for growing settlements.
Public health: The organized effort to protect and improve the health of populations. Sanitation became a public responsibility as cities linked unsafe water and waste to disease.
Night soil: Human excreta collected from toilets and used as fertilizer, especially in parts of East Asia. Reuse-based systems differed sharply from sewerage that transported waste to rivers or treatment plants.
Cloaca Maxima: An ancient Roman drainage channel that evolved into part of the city’s sewer system. Its long history shows how drainage infrastructure was adapted as Rome expanded.
Water tower: An elevated tank that stores water and maintains pressure in a distribution system. Elevated storage helped utilities deliver water reliably across urban networks.
Cholera: An acute intestinal infection caused by the bacterium Vibrio cholerae, often spread through contaminated water. Repeated epidemics exposed the health costs of polluted urban water supplies.
Septic tank: An underground tank that settles and partly treats household wastewater where centralized sewers are unavailable. On-site treatment offers an alternative to connecting every home to a sewer network.
Mohenjo-daro: A major city of the Indus civilization, noted for planned streets, wells, baths, and household drains. Its domestic water and drainage works reveal sophisticated urban sanitation in the third millennium BCE.
Water distribution system: Pipes, pumps, storage, and controls that deliver treated water from a source to users. Distribution networks turned water supply into a continuous urban service.