Face coverings will be required inside all Hillsborough County facilities beginning Monday, August 2.
The new safety guidelines come as COVID-19 cases continue to surge in Florida.
According to the county, face coverings will be required not only for county employees but also visitors, despite their vaccination status.
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"The measure is being taken as a precaution for the health and safety of County employees as well as residents," the county said in a press release.
County facilities, which the guidelines apply to, include libraries, parks and the Frederick B. Karl County Center.
The safety guidelines will also affect in-person public comments at the Board of County Commissioners (BOCC) meetings, beginning Aug. 4.