Radon System Alarms and Monitors: How to Know Your System is Working

There are three main levels of radon system monitoring, each providing a different type of information and level of convenience. Understanding your options helps you choose the right approach for your home and lifestyle.

A properly installed radon mitigation system includes monitoring from the start. The most basic option is the manometer that comes standard with every system. It tells you whether the fan is creating suction. The next level is an electronic fan alarm that alerts you automatically if the fan stops working. The most comprehensive option is a continuous radon monitor that measures actual radon levels in your home, confirming not just that the fan is running but that it is effectively reducing radon.

Each option has its place, and many homeowners use a combination. The manometer is your daily visual check. An electronic alarm provides automated notification. A continuous monitor gives you ongoing confidence in your actual radon levels.

Every professionally installed radon system includes a manometer, the simple U-tube gauge mounted on the pipe. This is your primary system indicator and costs nothing extra. It is included with every installation because industry standards require it.

The manometer tells you one thing: whether the fan is creating suction in the pipe. If the liquid levels are uneven, the fan is working. If they are equal, something is wrong. It does not tell you what your radon level is, only that the system is running.

The advantage of the manometer is its simplicity and reliability. It has no electronics, no batteries, no Wi-Fi connection to maintain. It works as long as it has liquid in it. For details on interpreting the gauge, see our manometer reading guide. The disadvantage is that you have to physically look at it. If you do not check it for weeks, you would not know if the fan stopped last Tuesday.

An electronic fan alarm is a device that monitors your system's pressure and alerts you when the fan stops creating suction. It connects to the pipe near the manometer and uses a pressure sensor to detect whether the system is operating normally.

When the system is working, the alarm stays silent (usually showing a green light). When the pressure drops below a threshold, indicating the fan has stopped or a blockage has developed, the alarm triggers. Depending on the model, this could be an audible alarm, a flashing light, or a notification to your phone.

Electronic fan alarms are a relatively inexpensive upgrade that adds automated monitoring to your system. They are especially valuable for homeowners who do not check their manometer regularly, who travel frequently, or who simply want the peace of mind of knowing they will be alerted if something goes wrong.

A continuous radon monitor is an independent device that measures the actual radon concentration in your home's air. Unlike a manometer or fan alarm that only tells you whether the system is running, a radon monitor tells you whether radon levels are actually low.

This distinction matters because there are rare scenarios where the fan is running but radon levels are still elevated. This could happen if new foundation cracks have developed, if the system's suction point has lost effectiveness, or if soil conditions have changed. A fan alarm would show everything as normal, but a radon monitor would reveal the elevated levels. If levels rise, contact us for professional system maintenance.

Consumer-grade continuous radon monitors typically cost between $150 and $300. They sit in your living space (usually the lowest level), take ongoing measurements, and display current and average radon levels. Many models connect to Wi-Fi and provide app-based monitoring with historical data and alerts.

For homeowners who use smart home platforms, some radon monitoring options integrate with systems like Apple HomeKit, Amazon Alexa, or Google Home. This allows you to check your radon levels alongside other home monitoring data and receive notifications through your existing smart home setup.

Some continuous radon monitors offer IFTTT (If This Then That) integration, allowing you to create automated responses. For example, you could set up an automation that turns on an exhaust fan, sends you a text message, or flashes smart lights if radon levels exceed a threshold.

The smart home approach is appealing for tech-savvy homeowners who want all their home data in one place. However, the basics still apply: even with smart monitoring, check your manometer monthly and get a professional test every 2 years. Technology is a helpful layer, not a complete solution.

The right monitoring approach depends on your budget, your habits, and your comfort level with technology.

If you are diligent about checking your manometer monthly, that may be all you need. Add in professional testing every 2 years, and you have a solid monitoring program at no additional cost.

If you tend to forget to check the manometer, or if you travel frequently, an electronic fan alarm ($30 to $80) is a worthwhile investment. It provides automatic notification so you do not have to rely on remembering to check.

If you want the highest level of ongoing confidence, a continuous radon monitor ($150 to $300) gives you real-time data about your actual radon levels. Combined with the manometer and periodic professional testing, this provides comprehensive coverage.