The deals are further evidence of the growth in the infrastructure market, which has been led to a number of contractors entering the sector.
United Utilities chief executive John Roberts said the agreements meant the firm's spending would be more predictable.
The biggest contract, worth more than £250m, was won by a joint venture between Interserve, Kier and J Murphy and Sons. It covers work throughout west Lancashire and north Manchester.
Interserve chairman Mike Bottjer said: "We are delighted to have been chosen by United Utilities to play such a vital role in this exciting project."
He added that the management team would be located near United Utilities' base at Warrington and employ local workers where possible.
A joint venture formed by Morgan Sindall's utilities arm Morgan Est, Barhale Construction and Harbour & General Works won the second deal. This involves work in Cumbria and the Ribble Valley.
This deal is worth up to £250m and is the first large infrastructure deal to be won by Morgan Sindall since it bought utilities company Pipeline Constructors last year.
The third contract was won by a joint venture between Costain and Galliford Try, and will be worth more than £215m over the three years. It covers projects in Cheshire and south Manchester.