If discoloration occurs, run the COLD water at one faucet for about 5 minutes, and you should see the water clear. (Running the hot water pulls from the water heater, which could make the problem worse.) If the water fails to clear after 5 minutes, wait for a few hours and again try running only the cold water. If the water is still discolored, contact your water supplier, who will look at the issue more closely. Even if you are in an apartment or don’t pay your water bill directly, it’s important to notify the water utility of any potential problem.