S.D. Warren Paper Mill is a small mill built on the Presumpscot River in the 1730s in a rural and fairly unpopulated area. In 1854, that small paper mill, in the soon-to-be established town of Westbrook, Maine, was purchased for $28,000 by Samuel Dennis Warren. The mill was named Grant, Warren and Company. In that year, the mill was only running two paper machines and had a production output of about 3,000 pounds of paper per day.