California Proposition 1 is the March 2024 ballot measure that rewrites how the state pays for mental health and addiction treatment and borrows $6.38 billion to build the facilities and housing where that care gets delivered. Voters approved it by about 26,242 votes out of millions cast, a 50.18% yes margin.1Ballotpedia. California Proposition 1, Behavioral Health Services Program and Bond Measure (March 2024) The measure bundles two pieces of legislation: Senate Bill 326, which overhauls the spending rules for the existing millionaire’s tax that funds county behavioral health, and Assembly Bill 531, which authorizes the bond.
What Proposition 1 Actually Changes
The underlying tax didn’t change. California still collects a 1% surcharge on personal income above $1 million, the same levy voters approved in 2004 under the old Mental Health Services Act.2Legislative Analyst’s Office. Proposition 63 – Mental Health Services Expansion and Funding What changed is the law that governs how counties spend it.
SB 326 renames the framework the Behavioral Health Services Act and widens its scope to cover substance use disorders alongside mental illness.3Lake County, California. Behavioral Health Transformation (BHSA) Under the previous rules, someone seeking addiction treatment through these funds typically needed a co-occurring mental health diagnosis. That requirement is gone. Counties can now spend the money on addiction care whether or not a mental health condition is also present.
The law also expressly funds peer support programs and family-based interventions that the 2004 structure either restricted or didn’t contemplate, so counties no longer have to choose between clinical and community-based models when designing their service mix.
Where the $6.38 Billion Bond Goes
AB 531, the Behavioral Health Infrastructure Bond Act, authorizes $6.38 billion in general obligation bonds, which are state debt repaid from future tax revenue.4California Legislative Information. AB 531 The Behavioral Health Infrastructure Bond Act of 2023 The California Department of Finance estimated the full cost at roughly $14 billion once interest is included, with average annual debt service payments of about $238 million.
The money is restricted to capital projects. It cannot pay staff salaries or any recurring operational cost. The point is physical infrastructure: crisis stabilization centers, residential treatment beds, and permanent supportive housing.
AB 531 splits the total into fixed pots:5California Legislative Information. AB 531 The Behavioral Health Infrastructure Bond Act of 2023
- $1.065 billion for permanent supportive housing for veterans with behavioral health needs.
- $922 million for permanent supportive housing for other people experiencing or at risk of homelessness.
- $1.5 billion in grants for cities, counties, and tribal entities to build treatment and residential care facilities, with $30 million specifically reserved for tribal entities.
- Up to $2.893 billion for additional competitive grants under the Behavioral Health Continuum Infrastructure Program.
The first round of competitive infrastructure grants made $3.3 billion available for projects that could begin construction quickly, with $1.5 billion set aside for local government and tribal applicants and $1.8 billion open to all eligible entities.6California Grants Portal. Behavioral Health Infrastructure Bond Act of 2024 – BHCIP Round 1 Launch Ready Permanent supportive housing under the measure means long-term apartments where tenants hold leases and receive on-site services such as case management and clinical care, not emergency shelter.
New Spending Rules for Counties
The old Mental Health Services Act gave counties broad discretion. Proposition 1 narrows it. Counties must now allocate their share of the Behavioral Health Services Fund across set categories, and the most consequential mandate is that 30% must go to housing intervention programs.1Ballotpedia. California Proposition 1, Behavioral Health Services Program and Bond Measure (March 2024) The rest is divided between Full Service Partnerships, which provide intensive wraparound services for people with the most severe conditions, and a broader category of behavioral health services and supports that includes early intervention and prevention.7Department of Health Care Services. Proposition 1 Fact Sheet
For counties that previously spent heavily on prevention or on programs serving uninsured residents, the new formula can mean cuts. For counties that spent little on housing, it means a sharp increase.
Oversight and Enforcement
The Department of Health Care Services received real enforcement authority. If a county fails to allocate funds according to the statute, DHCS can impose a corrective action plan, temporarily withhold up to 25% of the county’s monthly allocation from the Behavioral Health Services Fund, and levy escalating monetary sanctions: up to $25,000 for a first violation, $50,000 for a second, and $100,000 for subsequent violations.8Department of Health Care Services. PLS Oversight and Monitoring Sanction dollars go into a separate accountability fund and are returned to the county once it comes back into compliance.
Proposition 1 also renamed the Mental Health Services Oversight and Accountability Commission to the Behavioral Health Services Oversight and Accountability Commission and expanded its voting membership from 16 to 27, adding seats for people with lived experience of substance use disorders, a housing and homelessness expert, a veterans’ representative, and a youth representative. The commission tracks county spending, publishes outcome data, and distributes innovation grants.
When It Takes Effect
Proposition 1 rolls out on a staggered schedule rather than switching on at once.
- Late 2024: Applications opened for the first round of bond-funded infrastructure grants and for the Homekey+ supportive housing program.
- May 2025: First round of infrastructure grant awards announced; a second round covering the remaining $1.1 billion in bond funds opened for projects addressing unmet needs.
- 2025 through 2026: Counties develop integrated plans for the 2026 through 2029 fiscal years under new BHSA guidelines, with full state guidance issued in early 2025.
- December 31, 2029: The State Auditor releases the first comprehensive report on BHSA implementation, with follow-up reports every three years.
The transition window exists because counties have to redesign budgets, renegotiate provider contracts, and in some cases wind down programs that no longer fit the mandated categories.
Why the Vote Was So Close
Opponents filed several objections in the official ballot arguments.9California Secretary of State. Proposition 1 Arguments and Rebuttals They said bond financing is the most expensive way for the state to pay for anything and that California had already spent $20 billion on homelessness in the preceding five years without clear results. They also argued the new spending mandates would gut county programs built over two decades, with prevention and early intervention services for underserved and uninsured residents likely to be cut first. Some opponents said the measure would accelerate involuntary psychiatric interventions.
Supporters said the previous system was designed before fentanyl, before unsheltered homelessness reached current levels, and before the gap between available treatment beds and demand became as wide as it is now. They argued no amount of service funding fixes a shortage of physical facilities, which is what the bond addresses.
Both sides had evidence for their position, and the 26,242-vote margin is the clearest sign that reasonable Californians disagreed about whether centralized mandates would improve local outcomes or damage them.