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

Is there lead in Barnstable's tap water?

1.8PPBparts per billion of lead in Centerville Osterville Marstons Mills Water District's water at the latest test, from January to June 2026

Under the legal limit of 15 ppb

Water companies that supply Barnstable

4 public water companies list Barnstable as a place they supply. The biggest is the Centerville Osterville Marstons Mills Water District, with about 50,000 people. The highest latest result among Barnstable's water companies is 3.1 parts per billion, at the Cotuit Fire District Water Department. None of the 4 with results was above 15 at its latest test. 1 found too little lead to measure. Small ones like Cotuit Fire District Water Department supply just their own grounds or street; most of Barnstable gets its water from the Centerville Osterville Marstons Mills Water District. Your water bill names yours.

The Centerville Osterville Marstons Mills Water Districtabout 50,000 people · latest lead test: 1.8 ppb · 508-428-6691
The Hyannis Water System Town of Barnstableabout 35,000 people · latest lead test: none found · 508-775-0063
The Barnstable Fire Districtabout 5,400 people · latest lead test: 1.4 ppb · 508-362-6498
The Cotuit Fire District Water Departmentabout 4,938 people · latest lead test: 3.1 ppb · 508-428-2687

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