24/7 Commercial
Alarm Monitoring

Founded by Sam Post over 60 years ago. Post Alarm is a family-run business committed to protecting our neighborhoods in Southern California.

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

Our UL Listed 5 Diamond Monitoring Station…Watching out for you 24/7.

Being in the security business for over half a century has done more than make Post Alarm one of the most reputable names in Southern California.  It has also given us distinct advantages over the competition. Our local monitoring services are the best in the business because we own and operate our own in-house Central Monitoring Station, where we personally monitor alarms from every one of our clients’ systems.


Locally Owned & Operated

Almost 30 years ago Post Alarm made the decision to own and operate their very own Central Monitoring Station as opposed to using a subcontracted monitoring facility like most other security companies.  


Fast & Reliable

With one of the fastest alarm response times in the industry (30 seconds or less), we maintain strict signal handling procedures, provide excellent training to our skilled operators, and maintain strict hiring criteria.  


UL Listed & Certified

Post Alarm is also one of the few companies in the USA to have earned the coveted UL Certification and has maintained it for over 20 years. UL Certification allows us to monitor high-risk clients, UL Fire Systems and more.

5 Diamond Certification


Not only does Post Alarm carry the hard to get UL Listing but we have also been awarded the coveted 5 Diamond Certification by The Monitoring Association.  This certification is awarded based on meeting and maintaining strict training criteria for every operator at every level.  This is just another way we can provide you peace of mind knowing you have the best, highly trained operators at your service 24/7.

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

- Brian

“Safety is ultimately up to you. The best you can do is harden the target. That’s what Post Alarm provides. They are a minute away. Post Alarm is a brand known and respected.”

- Glenn

“What I love most about Post Alarm is their ability to accommodate our business needs.”

- Tammy

“I’ve been a Post Alarm customer for over 40 years, and have never had a complaint or fault with any of their services.”

- Robert

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