Officials in Las Vegas say the city is in violation of drinking water standards, but that the water remains safe to drink.
The Las Vegas Optic reports that three of 10 samples taken during a recent test showed the presence of coliform bacteria.
Officials say coliform bacteria are generally not harmful and are naturally present in the environment.
Still, the city in northern New Mexico is advising people with compromised immune systems, infants and the elderly that they could be at increased risk.
The city says coliform presence is a sign there could be a problem with the treatment or distribution system.
When coliform is found, the city does follow-up testing to determine if fecal coliform or E. coli are present.
Officials say none of those bacteria were found.
Information from: Las Vegas Optic, http://www.lasvegasoptic.com
Copyright 2013 The Associated Press.