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The °µÍø½ûÇøal Protection Agency and the Department of the Army said the reworked rule is . Federal officials said they wrote a “durable definitionâ€� of waterways to reduce uncertainty.

In recent years, however, there has been a lot of uncertainty. After the Obama administration sought to expand federal protections, the Trump administration rolled them back as part of its unwinding of hundreds of environmental and public health regulations. A federal judge rejected that effort. And a separate case is currently being considered by the Supreme Court that could yet upend the finalized rule.

"We have put forward a rule that’s clear, it’s durable, and it balances that protecting of our water resources with the needs of all water users, whether it’s farmers, ranchers, industry, watershed organizations,� EPA Assistant Administrator for Water Radhika Fox told The Associated Press.

The new rule is built on a pre-2015 definition, but is more streamlined and includes updates to reflect court opinions, scientific understanding and decades of experience, Fox said. The final rule will modestly increase protections for some streams, wetlands, lakes and ponds, she said.

The Trump-era rule, finalized in 2020, was long sought by builders, oil and gas developers, farmers and others who complained about federal overreach that they said stretched into gullies, creeks and ravines on farmland and other private property.

°µÍø½ûÇøal groups and public health advocates countered that the Trump rule allowed businesses to dump pollutants into unprotected waterways and fill in some wetlands, threatening public water supplies downstream and harming wildlife and habitat.

“Today, the Biden administration restored needed clean water protections so that our nation’s waters are guarded against pollution for fishing, swimming, and as sources of drinking water,â€� Kelly Moser, senior attorney for the Southern °µÍø½ûÇøal Law Center’s Clean Water Defense Initiative, said in a statement.

Jon Devine, director of federal water policy for the Natural Resources Defense Council, called repealing the Trump-era rule a “smart move� that “comes at a time when we’re seeing unprecedented attacks on federal clean water protections by polluters and their allies.�

But Republican Sen. Shelley Moore Capito called the rule “regulatory overreach� that will “unfairly burden America’s farmers, ranchers, miners, infrastructure builders, and landowners.�

Jerry Konter, chairman of the National Association of Home Builders, struck a similar note, saying the new rule makes it unclear if the federal government will regulate water in places such as roadside ditches and isolated ponds.

A 2021 review by the Biden administration found that the Trump rule allowed more than 300 projects to proceed without the federal permits required under the Obama-era rule, and that the Trump rule significantly curtailed clean water protections in states such as New Mexico and Arizona.

In August 2021, the Trump-era rule and put back in place a 1986 standard that was broader in scope than the Trump rule but narrower than Obama’s. U.S. District Court Judge Rosemary Marquez in Arizona, an Obama appointee, said the Trump-era EPA had ignored its own findings that small waterways can affect the well-being of the larger waterways they flow into.

Meanwhile, Supreme Court justices are considering arguments from an Idaho couple in their business-backed push to curtail the Clean Water Act. Chantell and Michael Sackett wanted to build a home near a lake, but the EPA stopped their work in 2007, finding wetlands on their property were federally regulated. The agency said the Sacketts needed a permit.

The case was heard in October and tests part of the rule the Biden administration carried over into its finalized version. Now-retired Justice Anthony Kennedy wrote in 2006 that if wetlands “significantly affect the chemical, physical, and biological integrity� of nearby navigable waters like rivers, the Clean Water Act's protections apply. The EPA's rule includes this test. Four conservative justices in the 2006 case, however, said that federal regulation only applied if there was a continuous surface connection between wetlands and an obviously regulated body of water like a river.

Charles Yates, attorney for the libertarian group Pacific Legal Foundation, said the new rule shows the importance of the Supreme Court case since the definition for WOTUS “shifts with each new presidential administration.�

“Absent definitive guidance from the Supreme Court, a lawful, workable, and durable definition of ‘navigable waters’ will remain elusive,� Yates said in a statement.

The Biden rule applies federal protections to wetlands, tributaries and other waters that have a significant connection to navigable waters or if wetlands are “relatively permanent.� The rule sets no specific distance for when adjacent wetlands are protected, stating that several factors can determine if the wetland and the waterway can impact water quality and quantity on each other. It states that the impact “depends on regional variations in climate, landscape, and geomorphology.�

For example, the rule notes that in the West, which typically gets less rain and has higher rates of evaporation, wetlands may need to be close to a waterway to be considered adjacent. In places where the waterway is wide and the topography flat, “wetlands are likely to be determined to be reasonably close where they are a few hundred feet from the tributary ...,� the rule states.

Fox said the rule wasn't written to stop development or prevent farming.

“It is about making sure we have development happening, that we’re growing food and fuel for our country but doing it in a way that also protects our nation’s water," she said.

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