PEER Services is a 501(c) (3) non-profit organization.  Since 1975, PEER Services has provided community-based substance use prevention and treatment services to teens, adults and families in Northern Cook County, including Evanston, Maine, New Trier, Niles and Northfield Townships, and the north side of Chicago. Our treatment services are available to all Illinois residents, regardless of their ability to pay, and clients have come from as far as north as Zion and from Chicago’s south and west sides.