How Did London’s Great Stink of 1858 Change Its Sewers?

In the summer of 1858, the smell rising from London’s River Thames reached the riverside Houses of Parliament. Hot weather and a falling water level exposed foul waste along the banks. The episode became known as the Great Stink. One of its most consequential legacies lay out of sight, beneath the city.

Soaking the curtains could not solve the problem

According to the UK Parliament’s account of its collections, chemicals were applied to the curtains in an attempt to reduce the smell. Moving parliamentary business to Oxford or St Albans was even considered. That does not mean Parliament actually relocated. River pollution had reached the very rooms where national decisions were made.

London already had drainage infrastructure. The problem was where it ended: in the river. Waste from homes and industry accumulated in the Thames, and a growing city put increasing pressure on this arrangement. Summer heat made a long-standing pollution problem impossible to ignore.

Fear of bad air, evidence about water

The idea that foul air caused disease, known as miasma theory, was widely accepted. Yet other explanations were being investigated. In 1854, physician John Snow examined cholera deaths in London’s Soho and identified a concentration around the Broad Street pump. He suspected contaminated water. Waterborne transmission challenged the prevailing explanation.

Drinking contaminated water is an important route of cholera transmission. A terrible smell and transmission through that smell are different claims. Understanding the Great Stink requires us to distinguish what people feared at the time from the actual route of infection.

A plan that did not suddenly appear in 1858

Civil engineer Joseph Bazalgette had been working as engineer to the Metropolitan Board of Works since 1856. Planning and implementing the main drainage system was already one of the board’s responsibilities. A citywide response was being prepared before the Great Stink arrived.

The Commons debate of 15 July 1858 records questions of funding and responsibility: who should pay, and did the board have sufficient authority to act? In the same debate, Benjamin Hall described the earlier review and revision of drainage plans and outfall locations. The stink can therefore be understood as a political catalyst for a delayed project, rather than the instant invention of a new idea.

Intercepting sewage before it reached the river

The key to Bazalgette’s scheme was the direction in which sewage travelled. Large mains collected waste from different districts and carried it eastwards. This was a citywide redesign of destinations, extending beyond repairs to individual local drains.

An interceptor collects sewage along its existing route. Local drains connect to larger mains, with tunnels and pumping stations forming a network. In the conceptual illustration below, three drains from buildings join a larger sewer running parallel to the river before reaching the water. It is not a map of London’s actual terrain or pipe dimensions.

Where levels allowed, sewage flowed under gravity; steam-powered pumps lifted it where necessary. At Crossness, pumps raised sewage into a covered reservoir for discharge on the ebb tide. Collecting pipes, lifting pumps and a reservoir controlling the timing of release each served a distinct purpose.

A changing city, visible in its pumping stations and embankments

Crossness Pumping Station opened on 4 April 1865. Its official heritage listing records elaborate interior ironwork and four large beam engines. Decorative columns alongside enormous machinery reveal the engineering and architecture invested in public sanitation.

Construction changed the riverfront too. Embankments provided space for major sewers, and the Victoria Embankment’s cross-section also accommodated a railway. But the opening ceremonies of 1865 did not mark the end of all work across London. London Museum dates completion of the overall project to 1875.

The transformation had costs. Historic England also describes the removal of riverside communities and businesses, and the disruption of livelihoods, during embankment construction. Assessing the achievement means considering both the pipes beneath the new riverfront and the people who had to make way for it.

Moving waste downstream is different from treating it

The early system carried raw sewage downstream for discharge. Reducing the burden in central London did not make the pollutants disappear. The Crossness timeline records a later move towards chemical precipitation and sludge separation around 1887–1891. Conveyance and treatment are connected, but distinct, tasks.

Modern sewage treatment includes removing large debris and grit, settling solids, and using microorganisms to reduce pollution. Carrying sewage a long distance through pipes does not, by itself, perform these processes. Treated discharge should not automatically be understood as water ready to drink.

The question the Great Stink left behind

The Great Stink raised questions about where waste should go, who would act and who would pay. Following the water leaving a home still reveals why managing pollution is a citywide responsibility: disappearing from view is only the start of its journey.

References

1. London Museum — The Great Stink of 1858
2. UK Parliament — Estimate of expense River Thames Purification Bill 1866
3. UK Parliament, Hansard — First Reading, House of Commons, 15 July 1858
4. Science Museum Group Collection — John Snow 1813–1858
5. Institution of Civil Engineers — Sir Joseph Bazalgette
6. Historic England — The Great Stink — How the Victorians Transformed London to Solve the Problem of Waste
7. London Museum — How Bazalgette built London’s first super-sewer
8. Historic England — Former Crossness Pumping Station, List Entry 1064241
9. Crossness Engines Trust — History Timeline
10. Thames Water — The sewage treatment process

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