In the early 1970s, after getting out of the Navy and working for Seattle-based Grinnell-ADT, Butte-born “Spike” McQuiston wanted to get back to his roots. So he returned to Montana, settled in Missoula and joined together some partners to start an alarm company/answering service/locksmith shop. In 1972, Interstate Alarm Company was incorporated.

In 1995 we moved the now-computerized monitoring equipment to our office, hired operators, and provided 24-hr alarm monitoring for the next ten years. To comply with ever growing regulations for monitoring of fire systems, in 2005 we made the decision to upgrade our customers to a UL certified facility where we are today. In 1998, we purchased another alarm company in Kalispell and entered the extensive custom-home market in the Flathead valley.

Over the years the company has grown steadily and we believe that it is because we have provided quality equipment, installations, and customer service that is unmatched by our competition. Proof of this lies in the fact that we still have customers with us today that began with us in 1972.

Our Services

Commercial Services:

• Camera systems with remote viewing to deter theft & reduce shrinkage.
• Door access control for sensitive areas.
• Burglary & fire protection with a 24 hr UL certified central station.
• Full Service Plans for peace of mind. Cellular backup communications in case of downed/cut phone lines.
• Sprinkler system monitoring. Portable & stationary panic alarm buttons for your employees.
• Regular reports emailed to you showing opening & closing times.
• And much more.

 Residential Services:

• Home/Sleep/Away modes of operation give you multiple levels of protection.
• Service plans to insure your system works when you need it most.
• Medical alert pendants to summon help with the push of a button.
• Life safety with monitored fire and carbon monoxide/gas leak sensors.
• Water sensors to help protect against costly water leaks.
• Temperature sensors to protect against frozen pipes while traveling or in that second vacation home.
• 24 hr monitoring with a UL-certified Central Station protects your home even while you’re not there.
• Green systems to help you control lighting, temperatures, home automation.
• Cellular monitoring of your system, either as your main source, or as back up protection. Remote access – check status or even arm your system thru the phone or internet. Remote key fobs – arming your system is as easy as locking your car.
• View/control your system over the web from anywhere in the world.
• And much more.