City of Coralville issued the following announcement on August 10.
The City of Coralville will require masks in its public, indoor facilities beginning on Wednesday, August 11, 2021, regardless of vaccination status. This requirement is in accordance with the guidance of the U.S. Centers for Disease Control and Prevention (CDC) and Johnson County Public Health (JCPH). This requirement will remain in effect until further notice.
Johnson County is currently listed at substantial community transmission on the CDC’s COVID data tracker. Wearing a mask, social distancing, and hand hygiene are effective ways to help keep the spread of COVID-19 and the Delta variant as low as possible. If experiencing symptoms, residents should stay home and contact a health provider regarding testing.
Original source can be found here