Routine water samples taken Wednesday revealed the presence of coliform bacteria in five of seven water samples throughout Post Falls, according to Public Works Director Terry Werner. "This is not an emergency," Werner said. "The Water Division is currently resampling the system and has turned on the chlorination equipment. City residents do not need to boil their water. People with severely compromised immune systems, families with infants, and some elderly may be at increased risk and may want to contact their health care provider for additional guidance.