Waterville, city, Kennebec County, southern Maine, at falls on the Kennebec River; incorporated as a city 1888. It has railroad repair shops and textile, wood-product, and garment industries. The city is a center of a lake resort and is the home of Colby College (1813) and Thomas College (1894). It was settled in 1754 with the establishment of Fort Halifax and was part of the town of Winslow until 1802. Population 17,779 (1980); 17,173 (1990); 15,605 (2000).