Effective 2/6/21, the state of California will allow indoor worship services, with attendance limited to 25% of capacity. The revised public health order can be found here.
The health order says the linked guidance found here for places of worship is being updated. The document, COVID-19 Industry Guidance: Places of Worship and Providers of Religious Services and Cultural Ceremonies, requires social distancing and specific cleaning protocols.
It also bans singing and chanting.