Pa. water study shows spill concerns small

PITTSBURGH (AP) — Pennsylvania’s waterways show little evidence of damage from toxic chemical spills from its fast-growing natural gas industry, according to a study published Monday in the Proceedings of the National Academies of Sciences.

The study examined the impact of gas drilling on surface water from the drilling boom but did not address questions of whether drilling has polluted underground aquifers, a main concern of environmental advocates.