
Below 15, the level that requires action
7 public water companies list Groton as a place they supply. The biggest is Groton Utilities, with about 30,200 people. The highest latest result among Groton's water companies is 6.1 parts per billion, at Mystic Village Apartments. None of the 7 with results was above 15 at its latest test. 4 found too little lead to measure.