California Department of Public Health Announces Mariposa and Inyo Counties Have Moved Into the Yellow Tier Details Last Updated: Tuesday, 25 May 2021 12:56 Published: Tuesday, 25 May 2021 12:56 May 25, 2021 - On Tuesday, the California Department of Public Health reported Mariposa and Inyo Counties moved into the Yellow Tier.Merced and Placer Counties moves into the Orange Tier.Source: CDPH