Up until now, landlords could choose not to work with Section 8, which is a federal housing subsidy program for low-income people. Landlords could advertise rental property declaring up front that they would not accept Housing Choice Vouchers. But no more.
Discrimination based on a tenant's "source of income" has already been a violation of the California Fair Employment and Housing Act, however housing vouchers were previously not considered to be part of a tenant's source of income since the subsidy is paid from an agency to the landlord directly. SB 329 changes the definition of source of income to include Housing Choice Vouchers (HCV).
So landlords -- you MUST NOT advertise that you will not accept Housing Choice Vouchers. This is now illegal. You may still have other application standards, such as a minimum credit score requirement, a requirement for no prior court evictions, etc. but you must be sure that you uniformly apply these standards with all prospective applicant tenants. Many properties will have a higher market rent than the maximum allowable rent for the property type and zip code. So while in some cases it is likely the property will not be a viable candidate for a voucher recipient, you still may not advertise blanket rejection of HCVs.
For full disclosure, I myself am a landlord and one of our tenants is a HCV recipient. This tenant has now rented from us for about 3.5 years and has been a great tenant. Jumping through the initial hoops of the HCV program was a real pain. It can take several weeks or months prior to the tenant's occupancy of a property to get through all the layers of paperwork, inspections, and repairs to make a property eligible for occupancy. There are also subsequent property inspections and interim paperwork requirements as well. But, the HCV rent payment magically appears in our bank account at the beginning of each month, and our tenant has never been late paying her small part of the rent that is proportional to her monthly income.
Overall for myself I'd characterize it as a positive experience, and I personally am so glad that we can offer some housing stability to a family who needs it...although I am personally generally not a fan of the government forcing mandatory compliance with its onerous programs. But I do urge landlords to keep an open mind with the HCV programs and just be prepared for a lot of up-front flexibility. I do believe the agencies who administer the HCV programs have done what they can to streamline the processes. In Sacramento County the program is administered by the Sacramento Housing and Redevelopment Agency (SHRA).
I can only hope there are not obvious unintended consequences of this legislation, such as application requirements for rented properties getting much more stringent -- like minimum credit scores increasing for everyone, for example. That overall will make it more difficult for renters to secure housing.