
Below 15, the level that requires action
13 public water companies list Monroe as a place they supply. The biggest is Monroe's water department, with about 12,000 people. The highest latest result among Monroe's water companies is 7.2 parts per billion, at Mansion Ridge Water Company. None of the 9 with results was above 15 at its latest test. 4 have no lead test results on file. 11 are small systems serving fewer than 500 people each, such as a mobile home park, a subdivision or a business with its own well.