Plumbing emergencies hit fast and they rarely happen at a convenient moment. In Belmont , Newton , Lexington , and Cambridge , it is common for homeowners to wake up to a burst pipe after a cold night, a basement drain backing up after heavy rain, or a water heater leak that spreads before anyone notices. “By the time we get the call, most homeowners are already dealing with water in places it should not be,” says David de la Roca, owner of Rhino Rooter. “The first few minute