A town's water main break resulted in flooding two townhomes' basements. A water main is an underground pipe that delivers water to the customer's service pipe. In residential areas it usually runs under the street. If a hole or crack develops in the pipe, the water will typically find its way to the surface. Because the water main is under pressure, water will continue to flow until the break is repaired. Arctic weather temps can also be to blame for water main breaks. As the fridge air temps cause rapid winter freeze-thaw cycle of the ground surrounding the pipes is what causes mains to flex and, in some cases, break apart.