EMF, Schools & Your Family

California's Department of Education recommends a 350-foot setback between a school and the edge of a 500 kV transmission easement (the buffer grows with voltage). Community mapping of SDG&E's projected alignment shows portions of Vail Ranch Middle School falling inside that 350-foot zone. ^[1]

Even the CPUC — the agency that will decide this project — requires utilities to limit magnetic-field exposure and to file an EMF management plan with their application. Stringing a 500 kV line up against homes and a school is the opposite of that. ^[2]

Expect SDG&E to say the line is “well under safety limits.” It is — but those limits were written to prevent immediate effects like nerve stimulation, not the childhood-leukemia association that prompted the health classification. Being under that limit does not address the concern. ^[3]

The World Health Organization's cancer agency classifies the extremely-low-frequency magnetic fields from power lines as “possibly carcinogenic to humans” (Group 2B). That label rests on a consistent finding: roughly a doubling of childhood-leukemia risk at the highest residential exposures — above about 0.3 to 0.4 microtesla. ^{[4] [5]}

These studies didn't measure a brief jolt — they measured the average magnetic field inside homes, around the clock, over months and years. That makes the question simple: which homes sit closest to the line, day in and day out? Residents don't choose the exposure, it runs 24/7 for decades, and children — the group the research is about — are home the most. ^{[4] [5]}

Because the field is strongest at the wires and drops off at greater distances, the homes nearest the right-of-way would sit in the 0.3–0.4 microtesla range the studies flagged.