Washington Post: The future cleanliness of the Washington regions drinking water has unexpectedly become a central concern in the national debate over the controversial natural-gas drilling method known as fracking. The gas industry is pushing to allow fracking in the George Washington National Forest, despite fears that it could threaten the cleanliness of the Potomac River. Its the sole source of drinking water for more than 4 million people in our area. ts no surprise that environmental groups are pushing...