In August 2010, the new standards were codified. They will go into force January 2011.
In April 2010, Pennsylvania proposed to finalize its regulations. The regulations set a 500 mg/l limit on TDS in treated oil and gas wastewater, ban direct discharges from drilling sites, and require dischargers whose waste has more than 30,000 mg/l of TDS to recycle that wastewater in other fracking operations.
Sierra Club and other groups, represented by the Pitt Environmental Law Clinic, filed comments on February 12, 2010.
PA DEP proposed revising its wastewater standards on November 7, 2009.