Secretary of Health (Order 20-03 series) and Governor (Proclamation 20-9.4, July 30, 2021), Secretary of Health Order 20-03 (face coverings) as amended, and Proclamation 20-9.4 (K-12 schools, July 30, 2021): masks required in K-12 schools for 2021-22 (Ex. ECO-B-152)
Governor Jay Inslee, Proclamation 21-14.1, COVID-19 Vaccination Requirement (amending 21-14) (Aug. 20, 2021) (Ex. ECO-B-053)
Ballotpedia (secondary source), Ballotpedia, 'School responses to the coronavirus (COVID-19) pandemic during the 2021-2022 academic year' (Aug. 1, 2022) (Ex. ECO-B-107)
