With California’s new stay-at-home order taking place in Marin County on Tuesday, officials also placed the region into the most restrictive purple tier after a surge of new coronavirus cases in the last few weeks.

With the addition of Marin County to the purple tier, the entire Bay Area is now put in the most restrictive coronavirus guidelines. Additionally, the majority of the state is included in the list of areas in the tier.

Officials look at two factors when placing a county into a tier; a region has to have an average percent positivity rate of more than 8% and an average of seven new cases per day out of every 100,000 people over seven days. This week, five counties in the Bay Area chose to implement a regional stay-at-home order ahead of the state.

State officials would implement the new lockdown rules to areas where intensive care unit capacities have reached 15% and below, KRON4 reported.

Alameda, Contra Costa, Marin, San Francisco, and Santa Clara county officials ordered stay-at-home ordered to curb the surge of coronavirus cases. The spread of the infection has seen numbers similar to the peak that they have experienced since the beginning of the pandemic.

On Tuesday, California’s health and human services secretary, Dr. Mark Ghaly, said the state had observed a staggering 55% increase in per cent positivity rate over the last 14 days.