Testing for dirty electricity requires a plug-in meter that measures high-frequency voltage transients on your home’s wiring, typically in the 10 kHz to 100 kHz range. The most common tool is a microsurge meter that plugs directly into a standard outlet and gives you an instant reading. You can also use a low-tech method with a portable AM radio to get a rough sense of electrical noise before investing in dedicated equipment.
What Dirty Electricity Actually Is
Your home’s electrical wiring is designed to carry a smooth 60 Hz alternating current (in North America). Dirty electricity refers to high-frequency voltage spikes and surges that ride on top of that smooth wave, contaminating the circuit with erratic energy in the 10 kHz to 100 kHz range. These transients are generated when devices chop up or convert the standard electrical current to operate. The result is electromagnetic noise radiating from your wiring and anything plugged into it.
Common household sources include dimmer switches, compact fluorescent (CFL) and fluorescent light bulbs, smart meters, LED bulbs with cheap drivers, and switched-mode power supplies (the small black adapters that charge laptops, phones, and other electronics). Solar panel inverters, variable-speed motors in appliances, and smart home devices can also contribute.
Using a Microsurge Meter
The standard tool for measuring dirty electricity is the Stetzerizer Microsurge Meter, made by Stetzer Electric. It plugs into any 120-volt outlet and displays a reading in Graham-Stetzer (GS) units, which represent the magnitude of high-frequency transients on that circuit. No setup or calibration is needed. You plug it in, read the number on the display, and move to the next outlet.
To test your home thoroughly, plug the meter into every accessible outlet in each room, one at a time. Write down the reading for each outlet along with its location. Pay special attention to outlets near electronics, lighting, and the kitchen, where appliances with motors and power converters tend to cluster. Test at different times of day, too. Readings can change depending on what’s running in your home and even what your neighbors’ equipment is pushing back onto shared utility lines.
Reading the Numbers
The commonly cited threshold is 50 GS units. Readings below 50 are generally considered low, and below 30 is sometimes described as optimal. It’s worth noting that a systematic review published in Frontiers in Public Health found no evidence that the 50 GS threshold is based on rigorous science, calling it essentially arbitrary. The number traces back to a 2003 sanitary norm from Kazakhstan, not a large body of dose-response research. Still, it provides a practical reference point: if your outlets consistently read in the hundreds or above 2,000 GS units (levels documented in some exposure studies), there’s clearly far more electrical noise on your wiring than in a typical clean environment, where control readings in studies ranged from roughly 4 to 70 GS units.
The AM Radio Method
If you want a quick, low-cost screening before buying a dedicated meter, a battery-powered portable AM radio can help. Tune it to a frequency where no station is broadcasting, somewhere between stations so you hear only static. Then walk slowly through your home, holding the radio near outlets, power strips, light fixtures, and appliances. When you pass a source of electrical noise, you’ll hear a distinct increase in buzzing, crackling, or whining through the radio’s speaker.
This method won’t give you a number, but it can help you locate which circuits or devices are the noisiest. The Government of Canada recommends a complementary step: a circuit breaker test. Turn off each breaker one at a time while listening to the radio (or watching a dedicated meter). When the noise drops after flipping a specific breaker, you’ve identified which circuit is carrying the most interference. Make sure any device on that circuit doesn’t have a backup battery that would keep it running after you kill the breaker.
Other Measurement Options
A few alternatives to the Stetzerizer meter exist. Some broadband EMI meters measure high-frequency noise in millivolts rather than GS units, giving you a voltage-based picture of the transients on your wiring. Line noise meters and oscilloscopes used by electricians can also visualize the waveform directly, showing you the shape and size of the distortion on your 60 Hz power. These tools are more expensive and more complex to interpret, so for most homeowners the plug-in microsurge meter remains the most practical starting point.
What to Do With Your Results
Once you have readings from every outlet, you can map which rooms and circuits have the highest levels. Start by identifying the devices on those circuits. Unplug suspect electronics one at a time and recheck the meter. Dimmer switches are a frequent culprit: replacing a dimmer with a standard on/off switch often produces an immediate drop in readings. Swapping CFL bulbs for incandescent bulbs or high-quality LED bulbs with better internal filtering can also help.
Plug-in filters designed to absorb high-frequency transients are the most marketed solution. These are capacitive filters that plug into outlets and shunt the noise. After installing one, you recheck the outlet with your meter to see if the reading dropped. In some cases, multiple filters per circuit are needed to bring levels down. Schools and homes where these filters were installed have reported reductions in the symptoms commonly attributed to dirty electricity, including fatigue, headaches, and difficulty concentrating, though the scientific evidence supporting health effects remains limited and debated.
If your readings are high throughout the house and you can’t trace the source to any of your own devices, the noise may be coming from outside. Smart meters on your home or neighboring homes, nearby solar inverters, or equipment on the utility’s distribution line can all push transients into your wiring. In that case, whole-house filtering installed at the electrical panel by a licensed electrician is the next step to explore.
Keeping Perspective on the Science
Research into dirty electricity’s health effects is still limited. A 2006 study reported that people with type 1 diabetes needed less insulin and those with type 2 diabetes had lower blood sugar in environments where high-frequency transients were filtered out. The same researcher reported improvements in balance and tremors among people with multiple sclerosis after filters were installed. These findings, largely from one research group, have not been widely replicated, and a systematic review noted significant methodological concerns across the existing studies, including the lack of a validated safety threshold.
What is well established is that high-frequency noise on electrical wiring can interfere with sensitive electronics, cause audible buzzing in audio equipment, and degrade the performance of some devices. Whether it affects human health at the levels found in typical homes remains an open question. Testing your home gives you data, and reducing electrical noise on your wiring is unlikely to cause any harm, so many people find it worth doing regardless of where the science eventually lands.