Los Angeles County Department of Public Health issued the following announcement on Sep 24.
We thank the FDA and the CDC for their thorough and thoughtful review of the data surrounding boosters. Starting today, eligible Los Angeles County residents can begin receiving their booster dose at any of the hundreds of sites offering the Pfizer vaccine. The booster dose offers enhanced protection for those fully vaccinated with the Pfizer vaccine 6 months ago who are at increased risk of getting COVID-19 and/or experiencing severe illness from COVID. The LA County vaccination network is prepared to offer boosters today while continuing to prioritize getting first doses to those eligible and not yet vaccinated.
Original source can be found here.
Source: Los Angeles County Department of Public Health