During 2011, Pennsylvania issued 3281 permits for Marcellus shale wells in 36 counties.
The top 5 counties in order were Bradford (735 permits); Tioga (372); Susquehanna (338); Lycoming (326); and Washington (247). These 5 counties accounted for 2018 of the total permits issued or 61%. One hundred or more permits were issued in 10 counties.
Well permits are being issued in more than half of Pennsylvania's 67 counties, while currently 10 counties account for just less than two-thirds of all activity.
The drilling activity will continue for decades across Pennsylvania. For example Bradford county leads in permits issued and had essentially twice as many issued there as second place Tioga. Yet drilling in Bradford for Marcellus may continue for 12 years by some estimates.
In Bradford and other counties drilling development began at 1906 well-sites during 2011.
The Pennsylvania Department of Environmental Protection issued 1090 violations at Marcellus gas well sites during 2011 or about 8% less than in 2010.
This level of activity is found in other parts of America and explains why gas fell below $3 during the middle of winter.