In June 1858, the most powerful legislature on Earth could not stand the smell of its own front yard. The Houses of Parliament sit right on the bank of the River Thames, and that summer the river had become, in the words of one newspaper, a “pestiferous and typhus breeding abomination.” Staff soaked the curtains on the river side of the building in chloride of lime to block the stench. It didn’t work. Members talked about packing up and moving the business of government to Oxford or St Albans. Within weeks, a Parliament that had argued about London’s sewage for years passed a law to fix it, and the result still runs under the city today.
The episode became known as the Great Stink. It is a story about heat, politics, and a wrong idea about disease that somehow led to exactly the right answer.
A city of three million, flushing into its river
London in the 1850s was the biggest city in the world, and it had grown faster than anyone had planned for. Its population had climbed from just under one million at the start of the century to about three million. Around 200,000 cesspits sat under homes and yards, and some of them leaked gases that occasionally caught fire and exploded. The city had about 360 sewers, many of them old and falling apart, and nearly all of them emptied straight into the Thames.
Ironically, progress made things worse. Better water supplies and the spread of the flushing toilet meant far more water was pouring into the sewers, carrying everything with it. Slaughterhouses, tanneries, and factories added their own waste. And because officials believed bad air spread disease, they made a point of flushing the sewers out regularly to keep them from smelling, which simply sent even more sewage into the river.
That river was also where many Londoners got their drinking water. Several private water companies drew it from the Thames, sometimes not far from where the sewers emptied.
Faraday’s white cards
People had been warning about the river for years. In July 1855, the scientist Michael Faraday took a steamboat trip down the Thames and ran a simple experiment. He tore white cards into pieces, wet them so they would sink, and dropped them into the water at each pier to see how quickly they disappeared from view. They vanished almost at once. In a letter to The Times, he wrote that near the bridges “the feculence rolled up in clouds so dense that they were visible at the surface,” and that “the whole river was for the time a real sewer.”
Punch, the satirical magazine, responded with a cartoon of Faraday handing his card to a filthy Father Thames, the river shown as a ragged old man rising out of the muck. Charles Dickens, in his serialized novel Little Dorrit, called the Thames “a deadly sewer” where a fine, fresh river should be. In 1857 the government tried pouring chalk lime, chloride of lime, and carbolic acid into the water to cut the smell. It barely helped.
The bad-air theory, and the doctor who doubted it
Victorian doctors mostly believed in miasma theory, the idea that diseases spread through foul air given off by rotting matter, sewage, and even the breath of sick people. The disease Londoners feared most was cholera, which can kill within hours by draining the body of fluid. It tore through the city again and again. An epidemic in 1831 killed 6,536 Londoners, another in 1848 and 1849 killed 14,137, and a third in 1853 and 1854 killed 10,738.
Not everyone accepted the bad-air explanation. A London physician named John Snow noticed that during the 1848–49 outbreak, death rates were higher in areas served by certain water companies. He argued that cholera spread through contaminated water, not through the air. In 1854, during an outbreak in Soho, he traced cases to a single public water pump on Broad Street and persuaded local officials to remove its handle. Deaths in the area fell. It later turned out that a leaking cesspit sat just a few feet from the well that fed the pump.
Snow’s work is now seen as a founding moment of modern epidemiology, but at the time most of the medical establishment wasn’t convinced. Bad air remained the official villain, which is part of why a terrible smell caused such panic. The same theory had been used for centuries to explain plague, as we covered in our guide to the types of plague, long before anyone knew about the fleas and bacteria behind it.
June 1858: the heat arrives
The summer of 1858 was brutally hot and dry. Shade temperatures in London averaged about 93 to 97 degrees Fahrenheit in June. With little rain, the river ran low, and the raw sewage that normally got carried away by the tide was left baking on the exposed banks. The journalist George Godwin reported deposits more than six feet deep on parts of the foreshore.
The press named it the Great Stink almost immediately. One London paper wrote that “gentility of speech is at an end — it stinks, and whoso once inhales the stink can never forget it.” The Illustrated London News put the national embarrassment plainly: “We can colonise the remotest ends of the earth; we can conquer India … but we cannot clean the River Thames.” Queen Victoria and Prince Albert reportedly set out on a pleasure cruise on the river and turned back within minutes.
In Parliament, the smell was impossible to escape. One account describes Benjamin Disraeli, then Chancellor of the Exchequer and leader of the House of Commons, fleeing a committee room “with a mass of papers in one hand, and with his pocket handkerchief applied to his nose.” Members complained that they couldn’t use the committee rooms or the library. When one asked the minister responsible what he planned to do, he replied that the Thames wasn’t under his jurisdiction. Punch joked that the only topic in either house was the “Conspiracy to Poison” question, and that the evidence against “that old offender, Father Thames,” was overwhelming.
At the height of the crisis, 200 to 250 tons of lime were being dumped near the sewer outlets, and men were hired to spread more of it on the foreshore at low tide, at a cost of £1,500 a week. It was treating a symptom, and everybody knew it.
Parliament moves at unusual speed
A plan to fix London’s drains already existed. Its author was Joseph Bazalgette, the chief engineer of the Metropolitan Board of Works, the body that ran the city’s sewers. Bazalgette had trained as a railway engineer and joined the sewer commission in 1849 after recovering from a breakdown brought on by overwork. By 1856 he had drawn up a full plan, but it had been stuck for two years in arguments over where the sewage should end up and who would pay for it.
The stink broke the logjam. On June 15, 1858, Disraeli introduced a bill that gave the Metropolitan Board of Works responsibility for cleaning up the Thames and let it borrow £3 million, to be repaid by a small charge on London households over the next 40 years. In the opening debate he called the river “a Stygian pool, reeking with ineffable and intolerable horrors.” The bill became law on August 2, 1858, less than two months later. The Times observed that Parliament had been “all but compelled to legislate upon the great London nuisance by the force of sheer stench.”
Bazalgette’s plan: catch it, then send it east
The idea behind the plan was simple. Instead of letting hundreds of sewers dump into the Thames as it flowed through central London, Bazalgette would build big new sewers running roughly parallel to the river, intercept the old ones before they reached the water, and carry everything downstream to outfalls well east of the city. There it could be released on the outgoing tide, far from where people lived.
The scale was enormous. The plan called for about 82 miles of large main sewers, fed by roughly 1,100 miles of street sewers. London was divided into high, middle, and low areas, each with its own main sewer. Gravity did most of the work, with the big sewers falling at about 2 feet per mile toward the east. Low-lying districts that sat below the high-tide line needed help, so pumping stations lifted their sewage up into the higher sewers.
Bazalgette was famously careful. He insisted on Portland cement, which was stronger than ordinary cement, and set up a strict system for testing every batch, a level of quality control that pushed manufacturers to improve their product. Records show him personally checking plans for local connections and scrawling notes on them like “I do not like 6″ used here and 9″ should be used.” He also designed the system for a city of more than four million people, well beyond the population at the time.
Building it, one embankment at a time
Work began in January 1859 and lasted until 1875. The south side of the river, less crowded at the time, was finished first. The north side, home to about two-thirds of Londoners, was much harder. Crews had to dig through packed streets and work around canals, bridges, and the new Metropolitan Railway, the world’s first underground line, which was being built at the same time. There were strikes, hard frosts, and floods. In June 1862, heavy rain caused a wall to collapse between a sewer trench and a railway cutting, spilling the waters of the old Fleet River into the excavations.
Bazalgette’s most visible solution was to build land out into the river. Along the north bank he constructed the Victoria Embankment, running from Westminster to Blackfriars, and later the Chelsea Embankment. On the south bank he built the Albert Embankment. Each one was a massive granite wall built out on the foreshore, with a sewer running inside it and fill packed around it. Together they reclaimed more than 50 acres from the Thames. The Victoria Embankment also carried a new road, which eased traffic between Westminster and the City, and later a stretch of the underground railway as well.
By the end, the work had used about 318 million bricks and roughly 880,000 cubic yards of concrete and mortar, and it cost about £6.5 million. Bazalgette was knighted in 1875.
Cathedrals of sewage
The pumping stations are the part of the system most people can still visit, and they are startling. Victorian engineers saw no reason a sewage works shouldn’t be beautiful. Crossness, on the marshes southeast of London, opened in 1865 with a ceremony led by the Prince of Wales, who started the engines, followed by a dinner for 500 people inside the building. Its four giant beam engines, built by James Watt and Co., were named Victoria, Prince Consort, Albert Edward, and Alexandra. The interior is a riot of painted cast iron in red, green, and gold.
Abbey Mills, in Stratford on the north side of the river, lifted sewage 36 feet from the low-level sewer into the main outfall sewer. Its domed, cross-shaped engine house has been compared to a Byzantine church. The architectural historian Nikolaus Pevsner described it as “exciting architecture applied to the most foul purposes.” Both buildings are now protected landmarks, and Crossness, whose engines were left in place when it closed in the 1950s, has been restored by a volunteer trust that runs its Prince Consort engine on open days.
Right answer, wrong reason
Here is the twist. Bazalgette’s sewers were built to get rid of the smell, because officials believed the smell was what made people sick. That belief was wrong. But by moving sewage away from the river where London drew its water, the new system also removed the cholera bacteria from the drinking supply. The disease faded wherever the sewers reached.
The final proof came in 1866, when one more cholera outbreak killed 5,596 people. It was concentrated in a part of the East End that had not yet been connected to the new system, and investigators traced it to a water company that had been storing water in a reservoir contaminated by sewage. The outbreak helped convince doctors and officials that cholera was carried by water, not air. It was the last cholera epidemic London ever had.
The historian John Doxat later wrote that Bazalgette “probably did more good, and saved more lives, than any single Victorian official.” When he died in 1891, his obituary in The Times said the great sewer under Londoners’ feet had “added some 20 years to their chance of life.”
Still working, and getting a successor
The system wasn’t perfect. For decades, raw sewage was still released into the river at the eastern outfalls, until treatment works were added later in the century. And Bazalgette built a combined system, carrying both sewage and rainwater in the same pipes, with overflow points that let the mix spill into the Thames during heavy storms so it wouldn’t back up into homes.
As London grew to around nine million people and paved over more of its ground, those overflows started firing more and more often. By the 2010s, as little as a couple of millimeters of rain could trigger one. The fix was the Thames Tideway Tunnel, a 16-mile “super sewer” dug as deep as about 230 feet beneath the river to catch overflow and carry it to a treatment works. It became fully operational in February 2025 at a cost of about £5 billion, and the company that runs it is named Bazalgette Tunnel Limited.
Big disasters often force big engineering. Boston only got serious about inspecting storage tanks after a wave of molasses swept through its North End, and bridge designers learned to respect wind after Galloping Gertie twisted itself apart. London needed a summer so hot and foul that Parliament couldn’t breathe.
The bottom line
The Great Stink of 1858 was the moment London’s sewage problem became impossible to ignore, because it reached the noses of the people with the power to fix it. Within two months Parliament funded Joseph Bazalgette’s plan, and over the next 17 years crews built a network of intercepting sewers, pumping stations, and river embankments that carried waste away from the city. It was designed around a mistaken theory about bad air, yet it ended cholera in London, reshaped the riverfront, and still carries the city’s waste more than 150 years later.
Keep your water clean, or read the cholera detective story
LifeStraw Personal Water Filter — Victorian London learned the hard way that dirty water spreads disease. This pocket-size straw filter, made for hiking, travel, and emergency kits, is rated by the maker to remove 99.999999% of waterborne bacteria and 99.999% of parasites, and to filter up to 1,000 gallons.
The Ghost Map: The Story of London’s Most Terrifying Epidemic — Steven Johnson’s gripping account of the 1854 Broad Street outbreak, and how John Snow and a local clergyman used a map of deaths to prove that cholera spread through water, four years before the Great Stink.