
Below 15, the level that requires action
5 public water companies list Potsdam as a place they supply. The biggest is Potsdam's water department, with about 8,312 people. The highest latest result among Potsdam's water companies is 7.8 parts per billion, at Potsdam's water department. None of the 5 with results was above 15 at its latest test. 4 are small systems serving fewer than 500 people each, such as a mobile home park, a subdivision or a business with its own well.