A group of GOP House energy leaders advised Health and Human Services Secretary Kathleen Sebelius Kathleen SebeliusSpecial counsel investigating DeVos for potential Hatch Act violation: report The Hill's Coronavirus Report: Mike Roman says 3M on track to deliver 2 billion respirators globally and 1 billion in US by end of year; US, Pfizer agree to 100M doses of COVID-19 vaccine that will be free to Americans The Hill's Coronavirus Report: Former HHS Secretary Sebelius gives Trump administration a D in handling pandemic; Oxford, AstraZeneca report positive dual immunity results from early vaccine trial MORE to exercise caution in a possible study on the health impacts of natural-gas drilling.

The Centers for Disease Control and Prevention is considering examining a potential link between hydraulic fracturing, or fracking, and drinking water contamination.

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The lawmakers sent a letter to Sebelius Friday stating that such a study could stymie job growth if not properly executed. They expressed concern in the letter that naturally occurring substances in groundwater could be improperly labeled as contaminants.

“Despite the significant growth of natural gas development, we are greatly concerned that the scientific objectivity of the Department of Health and Human Services is being subverted and countless jobs could be in jeopardy,” the lawmakers said.

Signatories included House Energy and Commerce Committee Chairman Fred Upton (Mich.); Rep. Ed Whitfield Wayne (Ed) Edward WhitfieldBottom Line Why Republicans took aim at an ethics watchdog What Azerbaijan wants from Israel? MORE (Ky.), the committee’s Energy and Power subcommittee chairman; Rep. Joe Pitts (Pa.), the committee’s Health subcommittee chairman; Rep. John Shimkus (Ill.), the committee’s Environment and the Economy subcommittee chairman; and past committee chairman Rep. Joe Barton (Texas).

Fracking is the drilling method credited with driving the nation’s shale gas boom. It involves injecting a high-pressure mixture of water, sand and chemicals into tight rock formations to tap hard-to-reach gas deposits.

Environmentalists, along with many congressional Democrats, argue fracking pollutes drinking water.

But industry, along with lawmakers from both sides of the aisle, says the practice is safe. They contend state regulators have ably handled fracking oversight, and that connections between fracking and groundwater contamination are faulty.

The Obama administration also has praised states’ regulatory record on fracking, while simultaneously calling for new regulations on federal lands.

The Environmental Protection Agency already is conducting a national study on fracking’s effects on drinking water. A progress report on that study is expected by the end of the year.