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Fracking may violate Safe Drinking Water Act, report says

We present an updated Watch List investigation into the controversial practice known as fracking — a process that energy companies use to force natural gas out of underground rock formations.

Fracking is short for hydraulic fracturing, a process that uses a mix of water and chemicals. Energy companies say the process is safe, but a new report prepared for a congressional committee charges that fracking may violate the Safe Drinking Water Act because of the use of diesel — millions of gallons of it — injected into fracking wells in 19 states.

We initially reported this story last summer with our colleagues at ProPublica, the nonprofit investigative journalism group. Correspondent John Larson gives us an update.

Related:

The prices of gas: A Need to Know investigation

Actor Mark Ruffalo speaks out against fracking

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