Dublin 24 splashes out on more water than anywhere else
Irish Water customers in South Dublin use more water than anyone else.
According to figures from the Central Statistics Office (CSO), households across the country consumed an average 351 litres a day in 2016, down 8.4pc on the previous year's figure of 383 litres.
However, households in Dublin 24 consumed the most water, with an average of 569 litres a day.
Areas within this postal code include Firhouse, Jobstown, and Tallaght. In contrast, Dublin 20 had the lowest annual average at 274 litres a day.
In 2016, Cavan had the lowest average consumption (298 litres) compared with Offaly which had the highest (398 litres).
The figures indicate that just 1pc of metered households use 25pc of all drinking water supplied by Irish Water.
This is said to be largely due to an abundance of leaks nationwide.
Around 75pc of annual total water consumption by metered customers was accounted for by 99.1pc of customers, using a consumption threshold of 1,000 litres per meter per day.
This means that just 0.9pc of Irish Water customers used a quarter of all drinking water in 2016.
Gerry Brady, from the CSO's environmental and climate division, told the Herald that this is because of leaks.
"There's no way that less than 1pc of households can use that much water. This is an indication that it has to be down to leaks," he said.
"Even though we can see that Irish Water has repaired a lot of burst mains there seems to still be a lot of leaks. This is having a big impact."
A spokesperson for Irish Water claimed any reduction in domestic use can be attributed to the company's First Fix Free programme.
Irish Water estimates that repairing defective water pipes in the Dublin area (totalling 8,000km) would cost around €5bn. The water network can supply 623 million litres while the typical daily requirement is 540 million. In the Dublin area, the buffer is just 2pc.
The population of the wider Dublin and eastern region is expected to grow by 500,000 in the next 20 years.