The Most Common Sources of EMF in the Home

In this article I will identify the most common sources of EMF in the home. There are many and some might surprise you.

EMF stands for electromagnetic field, they are invisible and you can’t smell or taste them. There are two types of EMF, natural and man-made.

Sources of natural EMF include the sun, lightning, and the earth’s magnetic field. Sources of man-made EMF include power lines, cell phones, and microwave ovens.

The average person is exposed to a background EMF of 0.2 to 2.0 mG (milligauss). EMF exposure increases with proximity to the source. For example, EMFs from power lines are much higher at the base of the power line than they are a few hundred feet away.

There are a number of ways to protect yourself from EMF including avoiding cell phone use, unplugging appliances when not in use, and using EMF shielding.

Trifield TF2 on desk

Measuring With The Trifield TF2 Meter

I will be using my favorite EMF meter Trifield model TF2 to measure electromagnetic pollution.

With the Trifield TF2 there are 5 numbers that can be measured which include standard magnetic field, standard electric field, weighted magnetic field, weighted electric field and RF.

my Trifield TF2 EMF meter with case

Its preferred that all 5 be below the following emf levels for a low EMF home.

  • Standard magnetic field under 3.0 mG
  • Standard electric field under 50 v/m
  • Weighted magnetic field under 5.0 mG
  • Weighted electric field under 50 V/m
  • RF radio and microwave under 0.200 mW/m (squared little 2) or 1.000 peak

Measure Where You Spend The Most Time

Using this meter check the areas where you spend time, if one of the numbers is high in the given location then you can take action to reduce exposure.

Periodically check again because of new construction and cell tower installations etc.

Trifield fast indicator bar to detect EMF hotspots

RF measure the power of 20 MHz – 6GHz radio waves. Includes most planned 5G cell towers. However, this meter cannot measure experimental 5G bands above 24 GHz.

You can measure the present value of the field and the highest value that’s occurred in the past 5 seconds. You can also follow fast changes.

Small Power Lines

small power lines

You might be surprised to learn that there are no Federal limitations on electric and magnetic fields from power lines in the United States.

The measurements from small power lines at a distance had very little magnetic fields of only 0.1 but always have a high electric field over 200 unless it’s blocked.

Fortunately this electric field rarely gets inside the house because it’s easily shielded by construction material or even by your hand.

Large Power Lines

Larger power lines usually do have a significant magnetic field of about 3.9 and this field can penetrate into the house.

These larger power lines also have a high electric field over 400.

If you live by large power lines moving isn’t always an options but there are step you can take to protect yourself from the magnetic fields.

Cell Towers

Cell towers emit quite a lot of RF these digital signals will fluctuate and may be hard to read so the peak is easier to read with the TriField meter. The peak at 1/4 mile away measured at 6.893.

There are more and more cell towers being put up everyday and unfortunately they are hiding a lot of the 5G towers so its getting hard to know where cell towers are.

Fortunately there are some helpful websites where you can locate 5G towers near you.

Dimmer Switches

dimmer switches

A dimmer switch that’s dimmed has some RF present 0.164. If you have the sound turned on it’s not very long so it can’t be heard in noisy environments. Weight electric is about 25. Weighted magnetic is about 20. Standard electric is about 30 and standard magnetic about 8.9.

When the dimmer switch is turned to full power the standard magnetic rises to 15.1 and the electric fields stay about the same. But the weighted magnetic decreased to 15.5 because high frequencies from the dimmer are no longer present.


Electric stove that’s off. There is some high magnetic field 2.1 probably from the clock. When the burner is turned on the field rises significantly to 9.8. The electric field is high near the clock but surprisingly very high near the refrigerator 301 Vm. Usually this can be fixed by unplugging it and plugging it back in with reverse polarity.

WIFI Router

When I measured my WIFI router the RF near a WIFI router is pulsing fast so the peak number is easier to read at about 9.684. Further away PEAK is 4.996 (about half as much).

wireless router emitting high levels of electromagnetic fields

If you are looking to reduce your WIFI router radiation you can get a WIFI router guard or even better get the best low EMF router.

The router is the JRS Eco Wireless Router which will only turn on when you are using your wireless devices and also can be set to emit lower levels of radiation.

Smart Meters From Electric Company

Smart meters from the electric company only pulse once a minute, watch for bars to jump. So set to RF and wait. Then read the PEAK about 7.260.

Smart Meters from Gas or Water may only pulse once a day so it’s probably pointless to try and measure that. You can invest in a smart meter guard to lower these levels.

Regular Landline Telephones

Regular landlines normally have a low RF but in some cases a near by cell tower can contaminate the telephone wires.


All microwave ovens leak a large amount of RF when on 2.401 with a PEAK of 9.037 close to the microwave when it’s warmed up. Both numbers decrease significantly as you back away.

Not that the peak number holds for 5 seconds with the TriField meter so wait for it to settle. By about 15 feet away the numbers are much lower 0.243 and PEAK of 0.506

Cell Phones

Cell phones can have significant RF if you are close to it. The RF drops off the further you are away from your phone. This means that you should use speakerphone and not hold it your phone as much as possible. If you are on your phone a lot and speaker phone isn’t an option you can get a pair of EMF free earbuds.

my favorite pair of air tube headphones

Another option is to look at anti-radiation phone cases they look like regular cases but reduce the EMF emissions.


Laptops when streaming data actually have a fairly low RF output of about 0.022 with a peak of 0.084. You can stop a large amount of EMF emissions going through the bottom of your laptop by getting a laptop radiation shield.

Hair Dryers

Have a very high magnetic field when turned on with a max over 20 mG. They have also have a very high electric field (approx 23) when off if plugged in incorrectly about about 180.

You body influences the near by electric field this means that you should hold the meter when measuring electric field in order to measure what you’re actually being exposed to.

More About EMFs

EMFs can be either static (like the Earth’s magnetic field) or dynamic (like those from power lines, electrical appliances, and broadcasting towers). They are classified as either low frequency (LF) or high frequency (HF). LF EMFs are those between 0 and 300 Hz, while HF EMFs are those between 300 Hz and 300 GHz. LF EMFs are those between 0 and 300 Hz, while HF EMFs are those between 300 Hz and 300 GHz.


Those are some of the most commons sources of EMF in the home. Once you establish what is emitting the highest EMF radiation you can take steps to eliminate or reduce the output.

One thing you can consider is placing EMF protection crystals around your home. This is an easy way to help neutralize some of the energy from your electronics throughout your house.

You can also take a look at my article about the top EMF protection products to find the best solutions for you to eliminate or reduce your radiation exposure.

There are arguments on both side about whether or not exposure to EMF is harmful or harmless. It seems to depend on who is doing the studies. However there are many scientists who say that EMF is linked to a variety of health problems. Better to be safe than sorry.