Non-community wells generally serve schools, restaurants, offices, daycares, churches, forest preserves/parks, and manufacturing facilities that are not part of the municipal water system. (They are not intended to supply a permanent population on a 24-hour basis.)
At least once per year, each non-community well is inspected and sampled for total coliforms. Total coliforms are indicator bacteria, meaning they show that there is a non-specific problem with the water or well. In most instances when a facility has an unsatisfactory water sample (present for coliforms), it is a random occurrence and chlorination of the system usually results in a negative resample result.
The percent of non-community wells that were positive for coliforms substantially decreased in 2014 and rose again in 2015.