In the last two years, some members of Congress have tried to limit the impact of the court decisions by introducing legislation known as the Clean Water Restoration Act. It has been approved by a Senate committee but not yet introduced this session in the House. The legislation tries to resolve these problems by, in part, removing the word “navigable” from the law and restoring regulators’ authority over all waters that were regulated before the Supreme Court decisions.

But a broad coalition of industries has often successfully lobbied to prevent the full Congress from voting on such proposals by telling farmers and small-business owners that the new legislation would permit the government to regulate rain puddles and small ponds and layer new regulations on how they dispose of waste.

“The game plan is to emphasize the scary possibilities,” said one member of the Waters Advocacy Coalition, which has fought the legislation and is supported by the American Farm Bureau Federation, the National Association of Home Builders and other groups representing industries affected by the Clean Water Act.

“If you can get Glenn Beck to say that government storm troopers are going to invade your property, farmers in the Midwest will light up their congressmen’s switchboards,” said the coalition member, who asked not to be identified because he thought his descriptions would anger other coalition participants. Mr. Beck, a conservative commentator on Fox News, spoke at length against the Clean Water Restoration Act in December.

The American Land Rights Association, another organization opposed to legislation, wrote last June that people should “Deluge your senators with calls, faxes and e-mails.” A news release the same month from the American Farm Bureau Federation warned that “even rainwater would be regulated.”

“If you erase the word ‘navigable’ from the law, it erases any limitation on the federal government’s reach,” said Mr. Parrish of the American Farm Bureau Federation. “It could be a gutter, a roadside ditch or a rain puddle. But under the new law, the government gets control over it.”

Image Some fault Lisa P. Jackson, head of the E.P.A., for not issuing new regulations to clarify jurisdiction of the Clean Water Act. Credit... Miguel Villagran/Getty Images

Legislators say these statements are misleading and intended to create panic.

“These claims just aren’t true,” said Senator Benjamin L. Cardin, Democrat of Maryland. He helped push the bill through the Senate Environment and Public Works Committee. “This bill,” he said, “is solely aimed at restoring the law to what it covered before the Supreme Court decisions.”