Ring in the New Year

With a new burglar alarm system and get a WiFi camera on us! Limited time offer valid for new customers only. Some restrictions apply.

Post Alarm Systems

Total Security with a Touch of a Button

We leverage the latest technology to keep you connected to your home. With easy remote access and a local response team on your side, you can rest assured that your home is always just how you left it.

Commercial Security in Southern California Since 1956.

Our highly trained team will custom design, install and support a full range of Security, Video, Access and Fire solutions to meet your specific needs.  Whether you own a small retail store or manage multiple businesses across SOCAL, from Los Angeles to Orange County, our experts have you covered.  

Advanced Home Alarm Systems Throughout SOCAL

Welcome to a new generation of home security & smart home automation. Residents throughout Los Angeles & Orange Counties have been protected by our local alarm company for over 60 years.

24/7 Alarm Monitoring

Post Alarm owns and operates it’s own UL Listed, CSAA 5 Diamond Central Station to provide personalized services and deliver an authentic unified solution to homes & businesses throughout Southern California.

Residential Patrol

Post Alarm’s highly trained Armed Patrol and Alarm Response Officers put you first and get help there quickly, often eliminating false alarm fines, and alerting the police when a real need arises.

Family Owned & Operated Alarm Company Since 1956

Owned and operated by the Post Family for over 60 years, we have become one of the largest, most respected full-service security companies in Southern California.

Complete commercial, home security & alarm monitoring in Los Angeles, Orange County, and SOCAL since 1956.


We’ve been in the security business for over 60 years and we’ve seen firsthand the happiness that comes when our clients feel safe in their homes. That’s why we offer custom designed, interactive security solutions with leading technology and service.


To protect your commercial business from theft, vandalism, or fire, our trained technicians will custom-design a system that uses cutting edge technology to manage all your security needs. We are here for you and your business all day, every day.

"We highly recommend Post Alarm to any homeowner considering an alarm system. The people, service, and products are second to none!"

D&M Weaver | Monrovia, CA
Clients Since 2009


Our unique security analysis process provides a personalized plan for your business or family’s needs.

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