Pennsylvania's top environmental regulator says he is confident that the natural gas industry is just weeks away from ending one of its more troubling environmental practices: the discharge of vast amounts of polluted brine into rivers used for drinking water.

Last Tuesday, the state's new Republican administration called on drillers to stop using riverside treatment plants to get rid of the millions of barrels of ultra-salty, chemically tainted wastewater that gush annually from gas wells.

As drillers have swarmed Pennsylvania's rich Marcellus Shale gas fields, the industry's use and handling of water has been a subject of intense scrutiny.

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