The purpose of this evaluation is to aid the Mental Health Services Oversight and Accountability Commission (MHSOAC) in its efforts to explore the impact the Mental Health Services Act (MHSA), as well as state and local policies and practices, has on disparities in access to treatment services and the quality of the outcomes of the public mental health system. The UC Davis Center for Reducing Health Disparities (CRHD) specifically plans to evaluate disparities in access by age, gender, race/ethnicity, and primary language at county, region and statewide levels. Depending on the availability of data, the CRHD also aims to investigate disparities in regards to sexual orientation/gender identity, country of origin, and relationship status (i.e., married, divorced, widowed). This evaluation is guided by a mixed-methods approach employing quantitative analyses of statewide data and qualitative Community-Based Participatory Research Methods (CBPR) with underserved and inappropriately served groups.