EPA to deliver water in Dimock

Federal regulators said Thursday that they would deliver drinking water to four households near natural gas wells in the embattled town of Dimock, casting doubt on Pennsylvania's decision to allow a Marcellus Shale operator to halt deliveries in December.

The U.S. Environmental Protection Agency also said it would conduct its own water sampling at 61 homes in the rural Susquehanna County township "to further assess whether any residents are being exposed to hazardous substances that cause health concerns."

"EPA is working diligently to understand the situation in Dimock and address residents' concerns," said EPA Regional Administrator Shawn M. Garvin. "We believe that the information provided to us by the residents deserves further review, and conducting our own sampling will help us fill information gaps."

The EPA's intervention is the latest development in its on-again, off-again involvement in Dimock, where the Pennsylvania Department of Environmental Protection blamed drilling by Cabot Oil & Gas Corp., of Houston, for contaminating water wells of 19 homes three years ago.

The controversy has pitted neighbor against neighbor, with some residents engaged in a federal lawsuit against Cabot, which denies its drilling contaminated the wells. Relations between state and federal regulators have become increasingly tart over the response.

Cabot halted water deliveries to the homes Dec. 1 after the state said it had met the terms of a 2010 settlement and after federal regulators declared the water posed no health risk.

But EPA reopened its investigation in December after seeing new test results, and then signaled this month that it would supply water to households, before backing away from that decision the next day.

Michael L. Krancer, the secretary of Pennsylvania's DEP, sent EPA a letter Jan. 5 calling the EPA's knowledge of Dimock "rudimentary."

Anti-drilling protesters demanded a federal intervention last Friday when EPA chief Lisa Jackson visited Philadelphia.

EPA toxicologist Dawn A. Ioven, in a memo posted on the agency's website, said well-test results from eight homes showed that four "contained contaminants at levels of potential concern."

The well water of one house, whose occupants include two toddlers, contained arsenic at levels that would pose a long-term cancer risk.

Three other houses contained excessive levels of manganese and sodium.