Cell Towers & EMF Exposure in California
Explore EMF exposure data for 155 cities across California. Find the lowest and highest EMF areas in the state.
Check Your California Address
EMF varies block by block. Enter your address for a precise score.
California ranks #37 nationally for EMF exposure, with 88,897 registered cell towers across the state. The state also has 5,941 transmission lines and 3,769 substations, which contribute to ELF (extremely low frequency) exposure near power grid infrastructure. The average EMF score across 155 analyzed cities is 58 out of 100, which is 4% 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 Huntington Park (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.
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 88,897 registered cell towers. Our RF sub-score measures exposure from towers within a 2-mile radius of each location.
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 5,941 transmission lines and 3,769 substations. Our ELF sub-score measures exposure from power infrastructure within 1 mile.
Recent FCC Tower Filings in California
New antenna structure registrations in the last 90 days
| Type | Purpose | Location | Height | Status | Filed |
|---|---|---|---|---|---|
| Monopole | Amendment | Hollister, CA | 103 ft | Granted | Mar 20, 2026 |
| Monopole | New Tower | Lindsay, CA | 147 ft | Constructed | Mar 19, 2026 |
| Monopole | New Tower | Brentwood, CA | 134 ft | Constructed | Mar 19, 2026 |
| Monopole | Modification | Concord, CA | 95 ft | Granted | Mar 19, 2026 |
| Monopole | New Tower | Kelseyville, CA | 590 ft | Constructed | Mar 19, 2026 |
| Monopole | Amendment | Lincoln, CA | 100 ft | Granted | Mar 17, 2026 |
| Monopole | Amendment | Taft, CA | 303 ft | Granted | Mar 17, 2026 |
| Lattice Tower | Modification | Castaic, CA | 1167 ft | Granted | Mar 16, 2026 |
| Lattice Tower | Modification | La Canada Flintridge, CA | 608 ft | Granted | Mar 16, 2026 |
| Lattice Tower | Amendment | Stockton, CA | 48 ft | Granted | Mar 16, 2026 |
Source: FCC Antenna Structure Registration (ASR) database · Updated daily
Cities with Most Cell Towers & EMF Exposure
California City Map
Showing 155 cities in California. Click a city for detailed EMF data.
All 155 California Cities: Cell Towers & EMF Scores
EMF Exposure & Health
EMF exposure remains an active area of scientific research. While regulatory bodies maintain that current exposure limits are safe, independent research has raised questions that lead many to take precautionary steps.
What research shows
We provide data, not medical advice. Consult healthcare professionals for personal health decisions.
How to Reduce EMF Exposure
Check Your Specific Address
EMF varies block by block. Your building's exposure depends on exact tower proximity, building materials, and which direction you face.
If You're House Hunting
When buying or renting in California, check the EMF scores of neighborhoods you're considering.
- Compare cities above
- Check specific addresses
- Consider upper vs lower floors (height affects exposure)
Quick Wins (Free)
Simple changes you can make today to reduce your daily EMF exposure without spending money.
- Move WiFi router away from bedrooms and work areas
- Use airplane mode while sleeping
- Use speakerphone or wired headset for calls
Bigger Investments
For those wanting more comprehensive protection, especially in high-exposure areas.
- EMF shielding film for windows facing towers
- Shielding paint for walls on tower-facing sides
- Professional EMF assessment of your home
Measure It Yourself
An EMF meter gives you real readings room by room — the most accurate way to know your exposure in California.
Prefer a Professional Assessment?
Certified EMF consultants can test your home in person with professional equipment and recommend targeted solutions.
Cell Tower & EMF FAQ for California
How many cell towers are in California?
What is the average EMF exposure in California?
Which California cities have the lowest EMF?
Which California cities have the highest EMF?
How does California compare to other states?
Is 5G available in California?
Zip Codes in California
EMF exposure data by zip code. Lowest EMF zip codes shown first.