The volumes of drilling wastewater from shale wells nearly quadrupled in the first 6 months of 2011, when compared to the first 6 months of 2010. Of the 10.1 million barrels of wastewater produced in the first 6 months of 2011, about 97% was recycled or deep well injected, according to the Associated Press. See
fuelfix.com/blog/2012/02/20/marcellus-shale-gas-drillers-recycling-more-waste/. It's not clear what happened to the remaining 3%. In the first 6 moths of 2010, Pennsylvania's Marcellus wells generated 2.8 million barrels of wastewater or about a quarter of the 2011 amount for the same period.
The AP also finds that the traditional shallow gas wells--non-Marcellus wells--are still taking their drilling wastewater to plants that may be discharging to rivers, without full treatment for Total Dissolved Solids. The AP calculates that 1.86 million barrels from these wells were produced in the first half of 2011.
Pennsylvania's regulations include a watershed requirement that TDS levels be kept below 75% of the Safe Drinking Water Act level. Monitoring of bromide levels are continued to be monitored and sources of bromide other than drilling wastewater are being examined.