Post Alarm Systems

Post Alarm Systems Family-owned since 1956. Trusted security solutions in Southern California for 3 generations. Locally operated. Protection Your Way.

Founded in 1956 by retired police chief Sam Post, Post Alarm has been a trusted name in Southern California for home security and commercial security for three generations. With an approach that blends local expertise with leading technology, we deliver best-in-class security solutions including burglar alarm monitoring, video surveillance, live video monitoring, patrol and armed response services

, fire alarm monitoring, and more. We pride ourselves on delivering customized security solutions, professional installation and service, and exceptional customer service. Contact us to experience the difference that nearly 70 years of security company expertise can make for you peace of mind. Trust Post Alarm to protect what matters most to you.

There's a real difference between having a camera and having a plan, and it's worth understanding before you leave for ...
06/17/2026

There's a real difference between having a camera and having a plan, and it's worth understanding before you leave for summer. A DIY camera will alert you and record what happens. But without someone monitoring live and verifying threats in real time, the response is on you.

Post Alarm's Vacation Shield means trained experts are watching, confirming, and dispatching Post Patrol or police the moment something looks wrong. Not after. Not when you see the footage. In real time.

That's what real peace of mind looks like while you're away. Call us at (800) 654-7678 to learn more!
https://postalarm.com/contact-us/

Peak renovation season means more people in your home than any other time of year. Do you know who still has access when...
06/10/2026

Peak renovation season means more people in your home than any other time of year. Do you know who still has access when the job is done? 🔑

A few simple steps go a long way:
→ Use temporary access codes that expire when the job ends
→ Check in remotely with live video monitoring
→ Review entry logs to see exactly who came and went
→ Lean on armed patrol as a visible neighborhood deterrent

Post Alarm makes all of this simple — smart access control, 24/7 , and local working together so your renovation doesn't become a security gap.

Most security systems do one thing. A camera records. An alarm sounds. But nobody's watching. 👁️There's a big difference...
06/08/2026

Most security systems do one thing. A camera records. An alarm sounds. But nobody's watching. 👁️
There's a big difference between detecting a threat and actually stopping one, and that difference is a human being.

At Post Alarm, our AI-enabled cameras flag unusual activity the moment it appears, instantly alerting you and our live operators. They review the footage, verify the threat in real time, and can speak directly to suspicious persons using two-way audio.

Simultaneously, they dispatch police and Post Alarm patrol for fast, on-site response.

That's detection. Deterrence. Response. All three with real people behind every step. Don't just monitor your home. Protect it. Call today for your free security assessment: (800) 654-7678!

New home checklist: Movers booked ✅ Furniture bought ✅ Security? Don't skip this one.Moving into a new home in LA means...
06/05/2026

New home checklist: Movers booked ✅ Furniture bought ✅ Security? Don't skip this one.

Moving into a new home in LA means there are unknown risks, and the best time to address them is before anything goes wrong. From re-keying locks to professional monitoring, this guide covers everything you need to protect your home from day one.

Post Alarm has helped LA families secure their homes for over 70 years. Let us help you do the same. Get your free quote today by calling us at: (800) 654-7678!

Tech-savvy burglars aren't just breaking in anymore; they're jamming your wireless system before they do. After a trauma...
06/03/2026

Tech-savvy burglars aren't just breaking in anymore; they're jamming your wireless system before they do.
After a traumatic burglary, Lauro switched to Post Alarm's fully wired system. No wifi signal. Nothing to jam. But the wired system is just one layer.

Real protection means detection that can't be disabled, deterrence that makes your home a hard target, and a response team that's already in your neighborhood when it matters. Post Alarm's armed patrol knows your streets, understands local law enforcement protocols, and gets there fast. That's not just a security system. That's a plan.

Don't wait for a break-in to find out what's missing; call us today at (800) 654-7678.
https://postalarm.com/contact-us/

Our team had an amazing time connecting with the community at Triangle Park, sharing real tools, answering real questi...
05/29/2026

Our team had an amazing time connecting with the community at Triangle Park, sharing real tools, answering real questions, and meeting the neighbors who make LA safer. This is why we do what we do. 💙

True home security isn't one lock or one camera; it's a system that works together from the street in.A layered security...
05/27/2026

True home security isn't one lock or one camera; it's a system that works together from the street in.

A layered security approach means threats are detected earlier, deterred sooner, and stopped before they reach your door.
From a well-lit exterior to smart locks at your entry points to sensors and monitoring inside, every layer plays a role.

Not sure where your home's vulnerabilities are? Our security experts can walk you through a custom assessment and build a plan that fits your home and your family. Get your free security quote by calling us at (800) 654-7678!

Happy Weekend! 🇺🇸 Keep these tips in mind and go enjoy that BBQ; we'll keep an eye on things while you're gone.
05/21/2026

Happy Weekend! 🇺🇸 Keep these tips in mind and go enjoy that BBQ; we'll keep an eye on things while you're gone.

This is what a promise kept looks like.For over 70 years and three generations, Post Alarm has made one commitment: to t...
05/18/2026

This is what a promise kept looks like.

For over 70 years and three generations, Post Alarm has made one commitment: to treat every client like family. Not a number, not a contract.

Your home deserves that same promise. Get protected today by calling us at (800) 654-7678.

LA crime is rising. And it's hitting closer to home than most people realize. is seeing a significant rise in property...
05/14/2026

LA crime is rising. And it's hitting closer to home than most people realize. is seeing a significant rise in property crime, and burglars are getting bolder and harder to stop after the fact. The difference between a close call and a break-in is often just one thing: whether someone was watching.

With Post Alarm Night Shield, someone always is. We've protected this community for over 70 years. Don't wait for something to happen: review your coverage today. Call us at (800) 654-7678!

Address

47 East Saint Joseph Street
Arcadia, CA
91006

Opening Hours

Monday 9am - 5pm
Tuesday 9am - 5pm
Wednesday 9am - 5pm
Thursday 9am - 5pm
Friday 9am - 5pm

Telephone

8006547678

Website

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