SANTA ANA (CBSLA.com) — An estimated 2 million residents in Orange County took part in the county’s regional mass notification system test Tuesday.

KNX 1070’s Ron Kilgore reports residents in 24 cities as well as unincorporated areas of Orange County will receive a call, email or push notification as part of the “AlertOC” test – which marks the region’s fourth – in conjunction with National Preparedness Month.

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Starting 10 a.m. through noon, the County’s emergency public information hotline was activated to provide preparedness tips and other emergency related information.

“We called approximately 600,000 land lines, cell phones, emails,” said Orange County Sheriff’s Emergency Management spokesman Raymond Cheung. “A lot of people called us back…everyone was very, very happy to get the call.”

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The phone message urged all residents to prepare for real-life emergencies by registering their cell numbers, text numbers and e-mail addresses at AlertOC.com for the best chance to receive timely information when away from home.

This weekend, emergency responders will conduct a live evacuation drill for the Cowan/Lemon Heights neighborhoods, according to Kilgore.

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Residents who want to get more information or register alternate phone numbers and email addresses were asked to visit AlertOC.com.