To improve from the purple tier to the red tier, a county must meet all applicable requirements for two consecutive weeks: fewer than 7 daily cases per 100,000, an overall positivity rate below 8% and, for counties above the population threshold, a positivity rate below 8% in the bottom quartile of census tracts as defined using the California Healthy Places Index.ĬDPH updates the tier list weekly on Tuesdays.
