Los Angeles County Health Survey

Image showing diversity of LA County residents

The Los Angeles County Health Survey (LACHS) is a population-based health survey that periodically collects data to serve Los Angeles County communities and residents. It was initiated in 1997 and has since completed 9 waves of data collection. The 8 waves of data collections between 1997 and 2018 were conducted via a random-digit-dial telephone survey. In the 2023 wave, the survey design was transitioned to an address-based sampling method with multi-mode (web and telephone) data collection. The LACHS includes two components: an adult survey of randomly selected adults ages 18 years and older; and a child survey administered to sufficiently knowledgeable adults about the health and daily routines of randomly selected children ages 17 years and younger. To account for language diversity, the survey is conducted in 6 languages: English, Spanish, Cantonese, Mandarin, Korean, and Vietnamese. The LACHS is the Los Angeles County Department of Public Health's primary vehicle for gathering data on a broad range of public health topics among county residents.

2025-2026 Los Angeles County Health Survey is currently underway!

The survey is conducted by the LA County Department of Public Health in collaboration with RTI International.

Your participation is essential, and we sincerely thank you for your time.