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Questions about History of water supply and sanitation

Short answers, pulled from the story.

When did people in Cyprus dig the first permanent water wells?

People in Cyprus dug the first permanent water wells around 8500 BCE. These deep holes allowed vessels to be filled by hand for daily use.

What ancient civilization built underground drains made of precisely laid bricks by 2200 BCE?

Indus Valley cities like Mohenjo-daro and Harappa developed underground drains made of precisely laid bricks by 2200 BCE. These systems included soak pits outside town walls and covered brick sewers held together with gypsum-based mortar.

Who constructed six main interceptor sewers totaling almost 100 miles between 1859 and 1865?

Joseph Bazalgette constructed six main interceptor sewers totaling almost 100 miles between 1859 and 1865. Construction required 318 million bricks and 2.7 million cubic metres of excavated earth.

Which city became the first to fluoridate drinking water following a vote by City Commission in 1944?

Grand Rapids Michigan became the first city world to fluoridate drinking water following a vote by City Commission in 1944. Dr H Trendley Dean investigated fluorosis epidemiology starting 1931 discovering fluoride levels up to 1.0 ppm did not cause enamel fluorosis in most people.

When did Maidstone Kent become the first town to have its entire water supply treated with chlorine?

Maidstone Kent became the first town to have its entire water supply treated with chlorine in 1897. Permanent water chlorination began in 1905 when Dr Alexander Cruickshank Houston stopped a serious typhoid fever epidemic in Lincoln England.