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A list of "regional determination letters" posted by the Pennsylvania Dept. of Environmental Protection on the DEP website. This list links to individual letters sent to homeowners who had water wells somehow affected by Marcellus Shale drilling. In most cases the water wells had methane (natural gas) migrate into the well--an eminently fixable problem. Of all the Marcellus wells drilled to date, this list indicates 3% of the wells drilled created problems for nearby water wells. Those numbers are actually improving year after year (causing fewer problems in 2011-2013 than prior to 2011).