False Alarm Statistics False Alarm Rates, the Cost of False Alarms, and US City Fine Schedules
Between 94 and 98 percent of the burglar alarms police respond to are false, and false alarms make up 10 to 25 percent of all calls for service. This page collects the numbers that actually have a primary source behind them, dates each one, and says plainly where a widely repeated figure is old or cannot be verified.
What the Data Says, in Three Sentences
The US Department of Justice's guide on false burglar alarms reports that 94 to 98 percent of alarm activations police respond to are false, that these calls make up 10 to 25 percent of all calls for service, and that each false alarm consumes roughly 20 minutes of two officers' time. The most-cited national cost figure, about $1.8 billion a year against 36 million alarm activations, comes from 2002 data, and no newer authoritative national estimate has replaced it. Because unverified alarms waste so much police time, dozens of US cities now fine repeat false alarms, require an alarm permit, or will only dispatch to a verified alarm, which is the case for video verification.
False Alarm Statistics at a Glance
Every figure below is tied to a named source and a year. Where a number is old or contested, the table says so.
| Statistic | Figure | Source and year |
|---|---|---|
| Share of alarm calls that are false | 94% to 98% | DOJ COPS, False Burglar Alarms (2nd ed.) |
| False alarms as a share of all police calls for service | 10% to 25% | DOJ COPS, False Burglar Alarms (2nd ed.) |
| Police time per false alarm | ~20 minutes, usually two officers | DOJ COPS, False Burglar Alarms (2nd ed.) |
| Alarm activations police responded to (national) | ~36 million | DOJ COPS, 2002 data |
| Estimated annual cost of alarm response | ~$1.8 billion (police-time estimate ~$1.5 billion) | DOJ COPS, 2002 data (dated) |
| Los Angeles false alarm fee | $176 per false alarm | LA Municipal Code 103.206 (2025) |
| San Francisco false alarm penalty (registered) | 1st free, then $100 / $150 / $200 / $250 | SF Treasurer & Tax Collector (2025) |
| Houston free false alarms before fines | 3 per 12-month permit period | City of Houston alarm ordinance (2025) |
City fees and free-alarm allowances change every budget cycle and vary by residential versus commercial. Treat the city rows as current examples, not a national rule, and check your own municipality.
How Many Burglar Alarms Are False?
The Department of Justice's Office of Community Oriented Policing Services, in its problem-oriented guide False Burglar Alarms, states that 94 to 98 percent of the alarm calls police respond to turn out to be false, and that in some jurisdictions the rate is even higher. That guide, authored by police consultant Rana Sampson, is the single most-cited source for the false alarm problem, which is why nearly every trade article traces back to it.
The causes are mundane and consistent: user error, doors and windows not secured before arming, pets and balloons setting off motion sensors, faulty or aging equipment, and low batteries. The industry's own trade groups agree that the overwhelming majority of activations are not crimes. That is the crux of the problem: an alarm signal, on its own, carries almost no information about whether a crime is actually happening.
Because the false rate is so high, the same guide notes that false alarms account for somewhere between 10 and 25 percent of all calls for service that police handle. In a mid-size department that is a meaningful share of patrol capacity spent driving to buildings where nothing is wrong.
What Do False Alarms Cost?
There are two costs, and they land on two different parties. The public cost is police time. The DOJ guide estimates each false alarm takes about 20 minutes and usually ties up two officers, and it puts the national police-time burden at as much as $1.5 billion a year. A separate estimate in the same body of work found that in 2002, police responded to roughly 36 million alarm activations at an annual cost of about $1.8 billion. Both figures are old. We flag that on purpose, because articles routinely quote the $1.8 billion number as if it were current, and there is no newer authoritative national estimate that has replaced it.
The private cost is fines, and those are current and well documented, because municipal ordinances are public. Los Angeles charges a $176 fee for each false alarm under municipal code 103.206. San Francisco gives a registered alarm one free false alarm per calendar year, then charges $100 for the second, $150 for the third, $200 for the fourth, and $250 for the fifth and beyond, with steeper penalties for unregistered systems. Houston allows three false alarms per 12-month permit period before fines begin. Most large US cities also require a paid alarm permit before they will dispatch to your alarm at all.
The penalties compound. A business that racks up repeated false alarms can have its alarm permit suspended or revoked, at which point the monitoring company can no longer get police dispatched to that address for alarm events until the permit is reinstated. So the real cost of a chronic false alarm problem is not only the fines, it is the risk of losing police response for the one alarm that turns out to be real.
Verified Response and Video Verification
The policy response to all of this is verified response. A growing number of US police departments will only dispatch to an alarm that has been verified as a genuine emergency, meaning a crime in progress confirmed by a person on site, by an alarm company operator, or by audio or video evidence. An unverified sensor trip goes to the back of the queue or gets no dispatch at all.
That is where video changes the math. A traditional sensor says only that something moved. A camera feed shows whether the something is a burglar or a cardboard box in the wind, and a verified alarm backed by video typically earns a faster, higher-priority police response than a bare sensor signal. The whole point of verification is to stop sending officers to nothing, so the alarms that do get through are far more likely to be real.
This is the practical case for AI video monitoring over a bare sensor network. When software watches the camera feeds, it can distinguish a person from an animal or a shadow before anything is ever escalated, attach the clip that verifies the event, and cut the flood of meaningless activations that generate fines and erode police goodwill. A modern video monitoring system does not just record; it decides whether an event is worth anyone's attention, which is exactly the judgment a raw alarm sensor cannot make. For sites that also want a live operator in the loop, we compare that model in our guide to monitoring services versus software.
False Alarm Questions
What percentage of alarms are false?
Between 94 and 98 percent of the burglar alarms police respond to are false, according to the US Department of Justice's guide False Burglar Alarms, with some jurisdictions reporting even higher rates. The overwhelming causes are user error, unsecured doors and windows, pets, and faulty equipment, not actual crime. That is why an alarm signal on its own tells police almost nothing about whether a real emergency is happening.
How much is a false alarm fine?
It depends on the city and how many you have had. Los Angeles charges $176 per false alarm. San Francisco gives registered systems one free per year, then $100, $150, $200, and $250 for repeat offenses. Houston allows three per permit year before fines start. Many cities also require a paid alarm permit and will suspend it after too many false alarms, cutting off police dispatch until it is reinstated.
How much do false alarms cost police?
The most-cited national figure is about $1.8 billion a year against roughly 36 million alarm activations, but that comes from 2002 data and no newer authoritative estimate has replaced it. The DOJ separately estimates the police-time burden at as much as $1.5 billion a year, with each false alarm consuming about 20 minutes of two officers' time. Treat the dollar figures as dated and directional.
What is verified response?
Verified response is a police policy of dispatching only to alarms confirmed as a genuine emergency, rather than to every sensor trip. Verification can come from a person on site, an alarm company operator who sees or hears a crime, or audio and video evidence. Unverified alarms get low priority or no dispatch. The goal is to stop sending officers to the 94 to 98 percent of activations that are false.
Does video verification get a faster police response?
Generally yes. In jurisdictions with verified-response policies, an alarm backed by video evidence of an actual crime is treated as a confirmed emergency and moved up the dispatch priority, while a bare sensor trip is not. Video also lets an operator or the software rule out the false activation before anyone is dispatched, so the alarms that do reach police are far more likely to be real.
What causes most false alarms?
The DOJ guide and industry groups attribute the majority to user error, most often doors or windows left unsecured before arming and mistakes with the keypad. The rest come from pets and moving objects tripping motion sensors, aging or faulty equipment, and low batteries. Very few false alarms are equipment reacting to an actual intruder, which is precisely why visual verification is so effective at filtering them out.
Sources
- US DOJ Office of Community Oriented Policing Services, False Burglar Alarms, 2nd Edition (Rana Sampson)
- Los Angeles Municipal Code, Section 103.206, Alarm Systems
- City and County of San Francisco, Emergency Alarm and False Alarm Information
- City of Houston, Burglar Alarm Administration and permit ordinance
Figures were verified against the sources above in July 2026. Municipal fees change often, so confirm your own city's current schedule before relying on it. If you cite a statistic, cite the original source and its year, not this page.
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