Water main replacement in NYC generally costs between $8,000 and $20,000 for residential properties. The total cost includes excavation, pipe materials, labor, NYC DEP permits, DOT street opening permits, inspection fees, and street restoration. Copper pipe is the most common choice for residential water mains in NYC, costing $15-$25 per linear foot installed. Ductile iron is used for larger commercial water mains. The depth of the water main, distance from the city main to your property, and soil conditions all significantly impact the final cost. Properties in Manhattan and downtown Brooklyn typically face higher costs due to complex underground conditions.