The Pennsylvania Department of Environmental Protection (PADEP) recently published rules requiring new or expanding facilities that treat wastewater from the oil and gas industries to meet new water quality standards. The rules, located here, require discharges from centralized wastewater treatment (CWT) facilities built or expanded after August 21, 2010 to meet the following standards: 500mg/L for total dissolved solids (TDS), 250mg/L for chlorides, 10mg/L for barium, and 10mg/L for strontium. Existing CWT facilities will not be affected by the new standards as long as they do not increase the amount of wastewater they process.
The rules require all oil and gas wastewater that is not recycled or injected underground to be treated at a CWT facility that has a NPDES permit to discharge the treated water. Publicly owned treatment works (POTW) may not receive oil and gas wastewater unless it has already been treated by a CWT facility.
Rationale for New Standards
The PADEP anticipates the Marcellus Shale boom to continue for years to come, with up to 50,000 new wells by 2030. Eventually, PADEP estimates that the industry will generate up to 4 million gallons of high-TDS water per day. The agency observed TDS concentrations in the state’s waterways steadily rising over the past few years as more wells were drilled. The new standards represent Pennsylvania’s attempt to balance the benefits of this modern-day gold rush with the finite ability of state waterways to dilute the large loads of the pollutant TDS generated by well drilling, fracturing and production.
“Dilution is not treatment. As documented by the rising levels of TDS in the waters of this Commonwealth, dilution in and of itself can no longer be considered an adequate practice to control consistently the effects of wastewaters containing substantial loadings of TDS and its components such as sulfates and chlorides. Treatment technologies such as reverse osmosis and evaporation/crystallization will have to be employed to prevent new or expanded loadings of TDS from consuming all of the remaining assimilative capacity in waterways in this Commonwealth.”
Impacts of Rules
The estimated cost to treat oil and gas wastewater to achieve the new standards is between 12 and 25 cents per gallon. This means that oil and gas producers in Pennsylvania may pay up to $365 million annually for TDS water treatment.
Other industrial sectors are not affected by the new rules and can continue to discharge wastewater with up to 2,000 mg/L of TDS. Industries outside of oil and gas can also apply for a variance from PADEP to discharge more than 2,000 mg/L of TDS. To get a variance a facility must demonstrate a need to discharge high levels of TDS and prove that the local waterway has capacity to safely assimilate the additional TDS loads and still have less than 500mg/L of TDS.
This article was co-authored by Laura G. Swingle and Aaron S. Heishman, Jackson Kelly PLLC. For more information on the authors see (Swingle) here and (Heishman) can be reached by phone at (304) 340-1048 or by email at asheishman@jacksonkelly.com.