Bay Area again requiring indoor masks for all By KTVU staff Seven Bay Area counties and Berkeley city requiring indoor mask for all Seven Bay Area counties and the city of Berkeley are now requiring indoor masking for all effective Tuesday midnight. KTVU's Rob Roth reports how businesses in Alameda are handling the new mandate. MARTINEZ, Calif. - Indoor masks will again be required in public settings in much of the Bay Area regardless of vaccination status, beginning on Tuesday. Eight Bay Area health officers on Monday issued the new health orders requiring face coverings, which had been mandatory in earlier points of the pandemic.