More than three miles of water pipes are being upgraded to help prevent leaks.
South East Water will start replacing old pipes in and around Haywards Heath tomorrow.
The company said the work, which will cost £800,000, will improve water quality and pressure as well as reducing the number of burst pipes which cause leaks.
The first stage, replacing 2.5 miles of pipe between Danehill and Chelwood Gate, will take around six months.
In May, a 10-week scheme to replace just under a mile a half-mile main pipe in Freshfield Lane, Danehill, will begin.
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