Water timeline
Four thousand years of water engineering, science, public health and regulation.
Ardern and Lockett described the activated sludge process in Manchester. It remains the dominant secondary wastewater treatment process worldwide.
- Year
- 1914
- Category
- engineering
The first Roman aqueduct. Rome eventually operated eleven, delivering water by gravity over distances up to 90 km, with distribution to public fountains, baths and some private supply.
- Year
- 312 BC
- Category
- engineering
Sennacherib’s aqueduct at Jerwan carried water to Nineveh across a stone arch structure, several centuries before Roman aqueduct construction.
- Year
- 700 BC
- Category
- engineering
A major city halved its water consumption and avoided supply failure, establishing demand management as a first-order drought response.
- Year
- 2018
- Category
- disaster
Wells, drainage and bathing structures at Mohenjo-daro and Harappa in the Indus Valley — among the earliest planned urban water and sanitation systems known.
- Year
- 2600 BC
- Category
- engineering
Introduced a risk-based approach across the whole supply chain and added parametric values for PFAS, bisphenol A and microplastics monitoring.
- Year
- 2020
- Category
- regulation
Required collection and treatment of urban wastewater across the EU, driving the largest programme of wastewater investment in European history.
- Year
- 1991
- Category
- regulation
Shifted European water management to river basin planning with ecological status objectives, the most ambitious water law adopted anywhere.
- Year
- 2000
- Category
- regulation
Middelkerke in Belgium began continuous chlorination; Jersey City followed in 1908, and the practice spread rapidly as typhoid rates collapsed wherever it was adopted.
- Year
- 1902
- Category
- public-health
Paisley, Scotland, installed the first treated public water supply using slow sand filtration, decades before the mechanism of waterborne disease was understood.
- Year
- 1804
- Category
- public-health
Established the international reference framework from which most national drinking water standards are derived.
- Year
- 1984
- Category
- regulation
A source change without corrosion control exposed a city to lead, and became the defining modern case of institutional failure in drinking water.
- Year
- 2014
- Category
- disaster
A UN decade-long programme that substantially expanded water and sanitation access in developing countries and established the global monitoring architecture that became the JMP.
- Year
- 1980
- Category
- public-health
Snow’s mapping of cholera deaths against water sources established waterborne transmission and founded epidemiology.
- Year
- 1854
- Category
- science
Established that chlorination alone is not a sufficient barrier and reshaped filtration regulation.
- Year
- 1993
- Category
- disaster
Methylmercury poisoning through contaminated fish established bioaccumulation as a central environmental health concept.
- Year
- 1956
- Category
- disaster
Loeb and Sourirajan developed the first asymmetric cellulose acetate membrane with useful flux, making reverse osmosis practical and eventually making seawater desalination economic.
- Year
- 1959
- Category
- technology
The ten regional water authorities were sold, creating the private regional monopoly structure regulated by Ofwat and the DWI — a model not replicated in Scotland, Wales or Northern Ireland.
- Year
- 1989
- Category
- regulation
Persian qanats — gently sloping tunnels tapping groundwater and conveying it by gravity — spread across arid Asia, North Africa and Spain, and some remain in use today.
- Year
- 600 BC
- Category
- engineering
Firefighting water carried agrochemicals into the Rhine, killing aquatic life for hundreds of kilometres and triggering the modern Rhine cooperation programme.
- Year
- 1986
- Category
- disaster
Singapore began large-scale planned potable reuse, demonstrating that advanced treated wastewater can be returned to supply reliably and acceptably.
- Year
- 2003
- Category
- technology
Set global targets for universal safely managed water and sanitation by 2030, with a far stricter service definition than the Millennium Development Goals it replaced.
- Year
- 2015
- Category
- regulation
The most severe UK drought of the twentieth century. Standpipes were used, a Drought Act was passed, and a Minister for Drought appointed — all still the reference point for UK drought planning.
- Year
- 1976
- Category
- disaster
London’s sewage crisis produced the intercepting sewer system that still underpins the city’s drainage.
- Year
- 1858
- Category
- engineering
One of the earliest statutes anywhere to prohibit the discharge of sewage and industrial waste to watercourses.
- Year
- 1876
- Category
- regulation
General Assembly resolution 64/292 recognised access to safe drinking water and sanitation as a human right.
- Year
- 2010
- Category
- regulation
Rebuilt US water pollution law around discharge permits and technology standards, and drove a transformation in the condition of American rivers.
- Year
- 1972
- Category
- regulation
The US EPA set the first enforceable national drinking water limits for PFAS, at 4 nanograms per litre for PFOA and PFOS — among the strictest chemical limits ever set for drinking water.
- Year
- 2024
- Category
- regulation
The first major US federal water pollution statute, and the foundation later rebuilt as the Clean Water Act.
- Year
- 1948
- Category
- regulation
Established federally enforceable drinking water standards in the United States for the first time.
- Year
- 1974
- Category
- regulation