Cell Towers & EMF Exposure in California

Q: How many cell towers are in California?

California has 88239 registered cell towers serving 152 cities. Tower density varies significantly between urban centers and rural areas.

Q: How does California compare to other states?

California ranks #37 nationally for average EMF exposure.

Explore EMF exposure data for 152 cities across California. Find the lowest and highest EMF areas in the state.

Avg EMF Score

#37

National Ranking

152

Cities Analyzed

88,239

Cell Towers

5,850

Transmission Lines

3,720

Substations

Check Your California Address

EMF varies block by block. Enter your address for a precise score.

California ranks #37 nationally for EMF exposure, with 88,239 registered cell towers across the state. The state also has 5,850 transmission lines and 3,720 substations, which contribute to ELF (extremely low frequency) exposure near power grid infrastructure. The average EMF score across 152 analyzed cities is 59 out of 100, which is 5% higher than the national average of 56. The highest EMF exposure is concentrated in major metropolitan areas like Downey (score: 79), Pico Rivera (79), and Los Angeles (78). However, many suburban and rural areas maintain significantly lower exposure levels, with cities like Temecula (24) and Santa Maria (27) ranking among the lowest in the state.

Population density is the primary driver of EMF exposure in California, as urban centers require more cell towers to handle network traffic. Power grid infrastructure such as transmission lines and substations also contributes to EMF levels, particularly ELF exposure. Rural and suburban areas typically maintain lower overall exposure.

Understanding EMF, RF & ELF

What is EMF?

EMF (electromagnetic fields) are invisible fields of energy produced by electrically charged objects. They are emitted by both wireless devices like cell towers and wired infrastructure like power lines.

Our EMF score combines RF and ELF exposure into a single 0-100 rating, giving you a complete picture of the electromagnetic environment at any location.

Why it matters: Growing research links prolonged EMF exposure to sleep disruption, stress responses, and other biological effects. Knowing your EMF level is the first step toward making informed decisions.

What is RF?

RF (radio frequency) radiation is emitted by wireless communication infrastructure including cell towers, 5G antennas, and broadcast towers. RF exposure depends on the number of towers nearby and how close they are.

California has 88,239 registered cell towers. Our RF sub-score measures exposure from towers within a 2-mile radius of each location.

Why it matters: RF is the dominant source of EMF in most urban areas. The WHO classifies RF radiation as "possibly carcinogenic to humans," and multiple studies have shown effects on sleep quality and brain activity.

What is ELF?

ELF (extremely low frequency) fields are produced by power grid infrastructure: high-voltage transmission lines, substations, and transformers. ELF exposure drops quickly with distance but can be significant for homes near these structures.

California has 5,850 transmission lines and 3,720 substations. Our ELF sub-score measures exposure from power infrastructure within 1 mile.

Why it matters: Living near high-voltage power lines has been associated with increased health concerns in epidemiological studies. ELF exposure is often overlooked but can be a major factor for homes near substations or transmission corridors.