Substance use treatment; Treatment for co-occurring substance use plus either serious mental health illness in adults/serious emotional disturbance in children; Outpatient; Regular outpatient treatment; Does not treat alcohol use disorder; Does not treat opioid use disorders; Private non-profit organization; State department of health; Council on Accreditation (COA); Federal, or any government funding for substance use treatment programs; Private health insurance; Cash or self-payment; Payment assistance (check with facility for details); Adolescents; Young adults; Comprehensive mental health assessment; Comprehensive substance use assessment; Outreach to persons in the community; Screening for substance use; Screening for mental disorders; Drug or alcohol urine screening; Aftercare/continuing care; Discharge Planning; Assistance with obtaining social services; Substance use disorder education; Individual counseling; Group counseling; Family counseling; Smoking not permitted; Adults; Children/adolescents; Young adults; Female; Male; Spanish; Vaping not permitted; Case management service; Mental health services; Social skills development