Core & Main Holds the No. 1 Market Position in the United States Locations Waterworks We distribute a complete line of water, sewer, fire protection and storm drain products to serve the needs of both contractors and municipalities. These products are integral to building, repairing and maintaining water and wastewater systems and serve as part of the basic municipal infrastructure required to support population and economic growth, and residential and commercial construction.  Whatever the project — from water and sewer line installation, stormwater retention systems and water/wastewater treatment plant construction to fire protection equipment and services