Alcohol and Drug Abuse Services (ADAS) provides a range of outpatient and residential treatment programs designed to reduce or eliminate the abuse of alcohol and other drugs within the community.

Services include crisis intervention, assessment and evaluation; individual, group and family counseling, HIV education, pre- and post-test counseling, and voluntary testing; TB education, counseling and testing; referrals to other programs when indicated; and outreach to schools and the general community. Specialized programs provide services for pregnant and parenting women, persons who require methadone maintenance and detoxification, adolescents, persons who have been dually diagnosed with substance abuse and mental health problems, and individuals referred by the Orange County Drug Court.

Risk Reduction, Education & Community Health (REACH) Program (formerly AIDS Outreach Project) provides HIV/AIDS education and outreach to the community, including street outreach to addicts who are not in treatment and who are at high risk for contracting and transmitting HIV, TB, and other communicable diseases.