This is directly from the National Cancer Institute:
“To estimate more accurately the risks of leukemia in children from magnetic fields resulting from power lines, researchers pooled (combined) data from many studies. In one pooled study that combined nine well-conducted studies from several countries, including a study from the NCI, a twofold excess risk of childhood leukemia was associated with exposure to magnetic fields above 0.4 µT (6). In another pooled study that combined 15 studies, a similar increased risk was seen above 0.3 µT (7).” http://www.cancer.gov/cancertopics/factsheet/Risk/magnetic-fields
So far the only possible link out there is to childhood leukemia. There is no other connections seen with adult cancers. Possible mechanism is through spontaneous DNA breaks, thus creating increased change of mutation that lead to leukemia. Apparently some ethnic groups such as Hispanics may be more susceptible to effect of EMF because of inherent genetic variations.
I would find out from SDG&E what level µT is on those lines. But in general the best distance is at least 500 feet away, and all of the homes on Shadetree are 250 ft away at best.
