SAMHSA is a government site that provides resources and information related to Substance Abuse and Mental Health issues. There is information related to trends, news articles, facilities, reports and much more. I have used this site the most for its Treatment Locators that help you search for Substance Abuse and/or Mental Health facilities by several criteria. You can also call their 24-Hour Helpline at 1-800-622-4357.
Check out their site at SAMHSA.gov