While most Darien households have private wells, about one-third of the town is served by Aquarion (800-732-9678), with offices in Greenwich. The website is aquarion.com.

Public water comes from the Aquarion regional pipeline that passes through Darien on its way from Bridgeport to Stamford. The company can also connect to Stamford’s water system as demand increases. For peak periods, the water company can draw from the Norwalk Second Taxing District.