The Center for Rural Pennsylvania has updated the report it financed that examined the water impacts of gas drilling. The report had previously found 7 water wells out of 233 where bromide levels had increased in before and after drilling measurements. Penn State researchers now state that 1 water well had increased bromide levels.
You can read a prior blog posting on this study on October 24th and an article about the updated report by Laura Olson of the Pittsburgh Post-Gazette at http://www.post-gazette.com/pg/11330/1192761-503.stm#ixzz1f0kcpSoY.
The original report also found no increases in methane levels in before and after drilling.