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.

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. đź’™

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!

On May 8th, two masked suspects broke into a   home just after noon while the homeowners were away. Their cameras caught...
05/13/2026

On May 8th, two masked suspects broke into a home just after noon while the homeowners were away. Their cameras caught everything. A neighbor who stepped outside to help was attacked with bear spray. Police arrived over an hour after the call. No arrests have been made, and it's part of a growing string of burglaries targeting homes across the San Fernando Valley.

An hour is too long to wait. When it comes to patrol and alarm monitoring, having it all under one provider isn't a luxury; it's what makes the difference in response time. Post Alarm's integrated monitoring and patrol are built for exactly this. Our patrol officers provide armed response and work directly alongside local law enforcement, because when every second matters, your security team should already be on the way.

Read the full story via KTLA 5 News here: https://ktla.com/news/local-news/daylight-studio-city-burglary-suspects/

 , we're coming to you! đź‘‹Heading into summer, we're seeing more activity across LA neighborhoods. The homes that stay sa...
05/12/2026

, we're coming to you! đź‘‹

Heading into summer, we're seeing more activity across LA neighborhoods. The homes that stay safer aren't just the ones with the best tech; they're the ones where neighbors are prepared and paying attention.

On May 16th at , we're bringing that conversation to you. Come hang, meet the team, and walk away with real tools you can actually use. Bring a neighbor, bring your questions — it's free and open to the whole community. We hope to see you there!

That patrol car you see in your neighborhood? It’s more than a presence; it’s an added layer of protection.Post Alarm’s ...
05/08/2026

That patrol car you see in your neighborhood? It’s more than a presence; it’s an added layer of protection.

Post Alarm’s armed patrol services provide a visible deterrent and rapid, local response when it matters most. When an alarm is triggered, our monitoring team verifies the event and dispatches trained officers to respond quickly and effectively.

Here’s what that looks like in practice:
✔️ Visible patrol presence helps deter criminal activity in your community
✔️ Alarm events are verified by our local monitoring team
✔️ Trained officers are dispatched immediately when needed
✔️ Coordinated response improves speed and accuracy in the field

Paired with Night Shield®, that response becomes even more proactive. With event-based live video monitoring and real-time verification by our trained agents, potential threats can be identified earlier, enabling earlier dispatch and faster intervention.

When monitoring and response are handled by separate security providers, handoffs can introduce delays, sometimes adding 5–7 minutes before the right information reaches the right team. With a coordinated system, communication is direct, streamlined, and faster.

Call us today for a free consultation: (800) 654-7678!
https://postalarm.com/services/patrol-service/

A   Valley burglary crew didn't just hit one home last week; they returned hours later to steal the truck out of the dri...
05/06/2026

A Valley burglary crew didn't just hit one home last week; they returned hours later to steal the truck out of the driveway.

Repeat targeting like this is becoming more common across LA neighborhoods. Burglars are patient, and a single camera or alarm isn't always enough to deter a second attempt.

Post Alarm was built for exactly this kind of threat — multiple layers of protection working together so your home stays secure. See why layered security works — and how Post Alarm puts every piece in place. https://postalarm.com/contact-us/

Residents in parts of the San Fernando Valley are on edge after a string of burglaries, including one in West Hills where suspects returned to the same home hours later and successfully stole a vehicle.

https://ktla.com/news/local-news/burglars-target-san-fernando-valley-homes-return-hours-later-to-steal-truck/

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

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