Substance use treatment; Outpatient; Intensive outpatient treatment; Regular outpatient treatment; Does not treat alcohol use disorder; Does not treat opioid use disorders; Tribal government; IHS/Tribal/Urban (ITU) funds; No payment accepted; Comprehensive substance use assessment; Interim services for clients; Outreach to persons in the community; Screening for substance use; Aftercare/continuing care; Discharge Planning; Outcome follow-up after discharge; Self-help groups; Substance use disorder education; Individual counseling; Group counseling; Family counseling; Smoking permitted in designated area; Female; Male; Vaping permitted in designated area; Case management service; Transportation assistance