Easton was first settled in 1757 by men and women from Fairfield. In 1762 a congregation called the North Fairfield Society was established, and it gradually evolved into Easton. In 1787 Weston, then including lands now defined as Easton, was incorporated out of Fairfield. The area was slow to develop because of the rough hills along the Aspetuck River, and so it was not until 1845 that what is now Easton separated from Weston. Today, half of the town's property is owned by the Aquarion Water Company of Connecticut, the major supplier of water in the area.