The effect is most pronounced in counties with many drinking water wells, indicating that contamination by "produced water" from fracking is a likely cause.
On May 1, workers have a chance to confront Trump by turning the tricks of his trade back on him -- dealing in the language of power.
Sarah van Gelder is cofounder of YES! Magazine and author of The Revolution Where You Live: Stories from a 12,000-Mile Journey Through a New America. Follow her on Twitter: @sarahvangelder.