Gwinnett County will replace four miles of water mains in older neighborhoods near Snellville, Lilburn and Norcross.

On Tuesday the Board of Commissioners awarded a $1.1 million contract to low bidder G.S. Construction Inc. for the work in the Forest Vale, Pebble Creek and Johnson Estates neighborhoods. The commission also awarded a $675,087 contract to The Dickerson Group to replace for work in the Hermitage Plantation neighborhood.

The older lines are prone to breaking. The county uses data on the age of pipes and frequency of repairs and service disruptions to determine which lines to replace.