Your water main is the lifeline of your property water supply. Warning signs of a failing water main include: discolored or rusty water, unexplained drops in water pressure, wet spots or puddles in your yard, a sudden spike in your water bill, visible corrosion on exposed pipes, water that tastes or smells metallic, cracks in your foundation, and your water main is made of lead or galvanized steel. NYC properties built before 1960 are most likely to have aging water mains that need replacement. Lead water mains pose a serious health risk and should be replaced immediately.