This is just trial lawyers hitting the "Cha-Ching" button.
People who are never exposed to anything have much weaker immune systems than those whose immune systems are challenged by low levels of things that are toxic at high levels. Same phenomenon as the fact that only-children are far more likely to contract leukemia than children from larger families.
HORMESIS - A biphasic dose response to an environmental agent characterized by a low dose stimulation or beneficial effect and a high dose inhibitory or toxic effect.
“Improvements in GC/Mass-Spec instrumentation has made 50 parts per billion detectable, but that doesn’t mean it’s harmful. “
The pre-2006 limit for water supply companies was 50 ppb, then to 10 ppb. Much of our ground water exceeds 10 ppb.
Apple growers beware... the lawyers will go after you for your the arsenic naturally found in then apple seeds.