
Below 15, the level that requires action
5 public water companies list Tyngsborough as a place they supply. The biggest is the Tyngsborough Water District, with about 4,416 people. The highest latest result among Tyngsborough's water companies is 5.7 parts per billion, at Curtis Hill Condominium. 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.