
Under the legal limit of 15 ppb
3 public water companies list Shelter Island as a place they supply. The biggest is the Shelter Island Heights Association, with about 500 people. The highest latest result among Shelter Island's water companies is 1.3 parts per billion, at the West Neck Water District. None of the 3 with results was above 15 at its latest test. Small ones like Dering Harbor Water District supply just their own grounds or street; most of Shelter Island gets its water from the Shelter Island Heights Association. Your water bill names yours.
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