The Wyoming Department of Environmental Quality is testing private wells in Hoback this week to find if benzene detected in Hoback Market's well is found in others nearby.
Benzene in Hoback Market's tap water measured 60 times the maximum allowed when the department tested it in March, and the agency says it came from the market's well. They said they are still looking for the source of the latest contamination.
Benzene is a compound found in gasoline and other sources that can cause cancer.
The department has asked five or six residents to draw water samples from private wells in the area to see whether benzene is present and determine where it originated.