Watercolour of a small house at dusk, with the water meter cover in the sidewalk out front.

Is there lead in Southold's tap water?

1.2PPBparts per billion of lead in Suffolk County Water Authority's water at the latest test, in tests since 2025

Under the legal limit of 15 ppb

Water companies that supply Southold

3 public water companies list Southold as a place they supply. The biggest is the Suffolk County Water Authority, with about 1,100,000 people. The highest latest result among Southold's water companies is 1.2 parts per billion, at the Suffolk County Water Authority. None of the 3 with results was above 15 at its latest test. Small ones like Fishers Island Water Works supply just their own grounds or street; most of Southold gets its water from the Suffolk County Water Authority. Your water bill names yours.

The Suffolk County Water Authorityabout 1,100,000 people · latest lead test: 1.2 ppb · 631-563-0258
The Greenport Water Districtabout 2,050 people · latest lead test: 1 ppb · 631-477-0248
Fishers Island Water Worksabout 380 people · latest lead test: 1 ppb · 631-788-7251

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