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Published December 26, 2011, 12:17 PM

North Dakota Rules Order Disclosure of 'Frack' Fluids

BISMARCK, N.D. (AP) — Proposed new North Dakota rules say oil companies have to disclose the recipe for special fluids they pump underground.

BISMARCK, N.D. (AP) — Proposed new North Dakota rules say oil companies have to disclose the recipe for special fluids they pump underground.

The procedure is called "fracking," which is short for hydraulic fracturing. Water, chemicals and grit are pumped underground at high pressure to break up shale rock and help the oil flow.

Critics say some companies are secretive about the makeup of fracking fluid. State Department of Mineral Resources director Lynn Helms says the proposed rules require companies to detail the information on a public website.

Helms says fracking fluids are made up mostly of water and some household chemicals.

He says fracking is a safe procedure if properly done, and it doesn't harm drinking water supplies.

The rules could take effect in April.

Copyright 2011 The Associated Press.

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