NI Water expects to spend a huge sum on upgrades
NI Water has announced plans to spend another £1.5bn upgrading water and sewage systems over the next eight years.
In a contract advertised on Tuesday it asked for expressions of interest from consultants and contractors to from a "capital delivery alliance."
The company said it was currently spending up to £150m on infrastructure every year.
The new spending plans will have to be approved by the utility regulator.
NI Water, a government owned company, was formed in 2007.
It inherited a significant backlog of under investment.
The company said that since it was founded it had invested nearly £1m every working day and opened five major wastewater schemes.
The regulator is expected to give his verdict on the spending plans for 2010 - 2013 in September.