Owned and operated by the Post Family for over 50 years, we have become one of the largest, most respected full service security and fire companies in Southern California.

Contact Post Alarm Systems

47 E. St Joseph St.

Arcadia, CA 91006

For almost 60 years, Post Alarm Systems has provided the very best residential and commercial security solutions for homeowners and businesses in Los Angeles and throughout Southern California. In fact, Post Alarm is one of the best security companies in the United States! Post Alarm is consistently ranked as one of the top 100 security companies in the nation by Security Dealer Magazine. Part of what has made Post Alarms one of the largest and most respected full-service security companies in Los Angeles is our commitment to customer service. We don’t use subcontractors, you can always speak with a live person 24/7, and we never lock our clients into long-term contracts.

Our residential and commercial security systems are monitored from our UL-listed Monitoring Center in Arcadia, CA. We invite you to stop by, take a tour of our facility, and speak with one of our representatives about your residential or commercial security needs. You can also call us toll-free at 1-800-654-6768 to speak with a live representative or to schedule your free, on-site security evaluation.

Driving Directions

From Los Angeles: Our headquarters is located in Arcadia, approximately 26 miles from Los Angeles. We recommend you take the I-10 East toward San Bernardino. Get off at Exit 28 for Santa Anita Ave and head north for approximately six miles. Turn right onto La Porte St., then a quick right onto Flower St. Flower will turn slightly left and become St. Joseph St, and our headquarters will be on your left.

From San Bernardino: If you’re driving from Riverside, Redlands, or San Bernardino, take the I-10 West toward Los Angeles. Take Exit 42 to merge onto CA-57 North toward the I-210 freeway. Merge onto the I-210 West/Foothill Freeway toward Pasadena and take Exit 33 for Huntington Dr. Turn right onto West Huntington Dr., followed by a right onto 2 nd Ave. Make a left onto St. Joseph in a half mile and our monitoring facility will be on the right.

LA Crime Statistics

Los Angeles is certainly not the most dangerous city in America, but that doesn’t mean you should pass up on an alarm system for your home or business. According to the most recent crime statistics from the Los Angeles Police Department, there have been more than 7,700 violent crimes and more than 30,000 property crimes committed in Los Angeles so far in 2015.

Important links and resources:

Orange County:


3303 Harbor Boulevard, Suite D-6
Costa Mesa, CA 92626

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