 Counseling, Couples Therapy, Group Drug Therapy. The center also provides its services in various environments, for instance Outpatient Drug Treatment. Tri County Mental Health Center Chesterfield Clinic also offers various programs that are customized to meet the needs of specific people such as: Alcohol Rehab for Persons with Co-Occurring Mental and Substance Use Disorders, Court Ordered Outpatient Drug and Alcohol Rehab. 