Toilets existed for thousands of years before they became standard household fixtures. For most of human history, even in societies that had sophisticated plumbing, private toilets were reserved for the wealthy. Flush toilets didn’t become common in middle-class Western homes until the late 1800s, and they didn’t reach most rural homes in the United States until the mid-20th century. Globally, billions of people still lack access to modern sanitation today.
Ancient Toilets Were Surprisingly Advanced
The earliest known private toilets date back roughly 4,500 years to the Indus Valley Civilization in what is now Pakistan and northwest India. Cities like Mohenjo-Daro and Harappa had brick-lined drainage systems, private bathing platforms, and both open toilets and seated commodes connected to covered sewers running beneath the streets. The brickwork was waterproof, and the town planning integrated sanitation into the urban grid in ways that wouldn’t be matched in Europe for millennia.
Ancient Rome also had public latrines and sewer systems, most famously the Cloaca Maxima. But these were communal, not private. Wealthy Romans sometimes had toilets in their homes, while most people used public facilities or chamber pots. When the Roman Empire collapsed, much of Europe lost its organized sanitation infrastructure and wouldn’t rebuild it for over a thousand years.
The Flush Toilet Took Centuries to Catch On
The idea of flushing waste with water from a cistern appeared as early as 1449, when a Londoner named Thomas Brightfield designed such a system. In 1596, Sir John Harington built a flushing toilet at his house near Bath for a visit from his godmother, Queen Elizabeth I. But these were curiosities, not products. No industry existed to manufacture or install them, and there were no sewer systems to connect them to.
The key technical breakthrough came in 1775, when a Scottish watchmaker named Alexander Cumming patented the S-shaped trap (the U-bend still used in toilets today). This curved section of pipe held a small amount of water at all times, creating a seal that prevented sewer gases from rising back into the home. Before this invention, indoor toilets smelled terrible and were a hard sell. Cumming’s design made the flush toilet practical for daily use indoors.
Thomas Crapper, whose name is forever linked to toilets, did not actually invent the flush toilet. Crapper was a London plumber who opened his sanitary works in Chelsea in 1861 and held nine patents related to plumbing fixtures, mostly minor improvements like silencing the hissing and gurgling noises cisterns made while filling. His real contribution was marketing. In 1866, he built the world’s first bathroom showroom, displaying white toilet pans behind plate glass windows where the public could see and even try them. He also supplied plumbing to Sandringham House, Buckingham Palace, and Windsor Castle, which helped make indoor toilets fashionable rather than scandalous.
The Sewer Crisis That Changed Everything
Even after the flush toilet existed, it couldn’t become common without somewhere for the waste to go. In London through the mid-1800s, flush toilets drained into cesspits or directly into the Thames. The summer of 1858 brought the “Great Stink,” when hot weather made the sewage-filled river so unbearable that Parliament could barely function. The crisis forced immediate action. Parliament authorized the Metropolitan Board of Works to build a massive sewer network, and chief engineer Joseph Bazalgette designed a system of 133 kilometers of new cross sewers covering the entire city, connected to roughly 720 kilometers of main road pipelines and about 21,000 kilometers of branch lines. The project was completed in 1875 at a cost of £4.6 million.
This infrastructure transformed London. For the first time, a major city had the underground network needed to connect thousands of homes to flush toilets. Other cities in Britain, Europe, and the United States followed with their own sewer projects over the next few decades. By the 1880s and 1890s, flush toilets were becoming standard in new middle-class urban homes across the industrialized world.
Working-Class Homes Came Later
While wealthier urban households adopted flush toilets in the late Victorian era, working-class families often shared outdoor privies well into the 20th century. In Britain, the Tudor Walters Report of 1918, commissioned after World War I, set new standards for working-class housing that included indoor sanitation. The massive public housing programs that followed gradually brought indoor toilets to millions of British families who had never had them. Still, shared outdoor toilets persisted in some older housing stock in British cities into the 1960s and even 1970s.
In the United States, the urban-rural divide was even more dramatic. Cities had widespread indoor plumbing by the early 1900s, but rural America was a different world entirely. Only 10 percent of rural Americans had electricity in 1937, and without electricity, there was no way to power the water pumps needed for indoor plumbing. Outhouses were the norm. Families bathed once a week, sharing the same water from oldest to youngest. Typhoid and other waterborne diseases were common.
Rural Electrification Was the Turning Point
The Rural Electrification Act of 1936 changed rural American life more than almost any other single policy. Before it passed, farmers were largely excluded from the technological advances urban residents took for granted. Electricity meant water pressure, which meant indoor plumbing, flush toilets, and refrigeration. Within 25 years of the push to electrify rural areas, 96 percent of rural America had power. Indoor bathrooms followed quickly. By the 1960s, flush toilets were effectively universal in American homes.
The pattern was similar across the developed world. Japan, for instance, transitioned rapidly from traditional squat toilets to Western-style flush toilets during its postwar economic boom, and by the 1970s and 1980s had embraced high-tech toilet seats with built-in bidets and heated seats that went well beyond Western standards.
Global Access Is Still Uneven
In wealthier countries, indoor flush toilets have been a baseline expectation for decades. But worldwide, the picture is very different. As of 2022, only 57 percent of the global population, about 4.5 billion people, used what sanitation experts classify as “safely managed” services, meaning waste is treated or disposed of safely rather than contaminating water sources. That leaves over 3 billion people relying on pit latrines, shared facilities, or no sanitation at all.
The regions with the lowest coverage are sub-Saharan Africa and parts of South and Southeast Asia, where rapid urbanization has outpaced the construction of sewer systems. In many fast-growing cities, millions of residents use toilets that drain into open channels or untreated pits, creating public health conditions not entirely unlike those of pre-sewer London. The challenge today is less about the technology of the toilet itself, which has been refined for over two centuries, and more about the infrastructure beneath the streets that makes it work.