COVID-19-Outbreak-Data COVID-19 Outbreak Data

COVID-19 Outbreak Data

California law requires employers to report COVID-19 outbreaks to local health departments. Local health departments then report those data to CDPH. 

Non-healthcare employers are required to report to their local health department when they identify three or more cases of COVID-19 in a workplace within 14 days. Local health departments determine whether the cases constitute an outbreak, using CDPH outbreak definitions, and report confirmed outbreaks to CDPH.

Latest Outbreak Data

Update as of April 5

From January 1, 2021 to April 5, 2021, a total of 5,603 confirmed COVID-19 outbreaks and 57,164 outbreak-related cases were reported to CDPH.

The most common settings for these outbreaks were:

  • Residential care facilities (21.3%)

  • Restaurants (7.0%)

  • Skilled nursing facilities (6.0%)

  • Grocery stores (3.6%)

  • Hospitals (3.5%)

  • Construction (3.3%)

Outbreak data does not equate to transmission risk within a particular industry. Because these data include only outbreaks reported to CDPH after January 1, 2021, and many settings have been either closed or open with capacity restrictions, numbers of outbreaks and cases in each setting do not directly reflect COVID-19 transmission risk in that setting. In addition, rates of outbreak identification and reporting may differ across settings, due to differences in testing and case tracking protocols. Also, the number of outbreaks in different settings will depend on the number of different workplaces in each setting. More outbreaks would be expected in settings with many workplaces compared to settings with few workplaces. 

While this report includes outbreaks reported between January 1, 2021, and April 5, 2021, it is possible that some of these outbreaks occurred prior to January 1, 2021. Due to reporting delays, it is possible that additional outbreaks occurred during this time and have not yet been reported to CDPH.

For more information on reported outbreaks, visit the CHHS Open Data Portal. Data will be updated every two weeks.

More information for employers and local health departments about outbreak reporting: