You can contact any one of our programs directly or call our administrative offices at:


Fax 510-582-1221

Please email us at or fill the form out below:

Mailing Address:

Horizon Services, Inc

PO Box 4217

Hayward, CA 94540

Administrative Offices

24051 Amador Street

Hayward, CA 94544

                           Horizon Services, Inc.

                 24051 Amador Street, Hayward, CA 94544

                                 (510) 582-2100

© 2017 HorizonServicesINC. All Rights Reserved.

HSI Values

Compassion: We approach our clients on their terms with a heart of service

Professionalism: Conducting ourselves in a manner that demonstrates appropriate boundaries and professional knowledge.


Mobilizing Science: We are curious, evidence-evidence-based and quality outcomes focused translating the best research into treating substance and mental health disorders into practice.


Respect: Understanding and rebuilding dignity with individuals and communities.