COLORADO — On behalf of the State of Colorado, Attorney General Phil Weiser filed a lawsuit in U.S. District Court in Denver to protect Colorado’s streams and wetlands from a dangerous federal rule that would leave them vulnerable to pollution under the Clean Water Act.

By radically changing how the U.S. Environmental Protection Agency and the U.S. Army Corps of Engineers define “waters of the United States” that are protected under the Clean Water Act, the new 2020 rule will leave a substantial portion of Colorado’s streams and wetlands without federal protection and jeopardize the integrity and quality of Colorado’s waters.

“The federal government’s new definition of ‘waters of the United States’ violates the Clean Water Act, contravenes controlling U.S. Supreme Court precedent, and ignores sound science,” Weiser said. “This illegal action shirks the federal government’s responsibility to implement this law and thrusts on Colorado the responsibility of protecting water quality with limited warning and with no support to do so. We are bringing this lawsuit to stop this new rule and reckless action from taking effect.”

The Clean Water Act protects U.S. streams, wetlands and rivers from pollution. Previously, under Supreme Court precedent, the rule included ephemeral streams—streams that run because of melting snow or precipitation—and wetlands that aren’t connected on the surface to larger bodies of water.

“We need to challenge this action to avoid a bigger problem for our economy at a time when our state is already hurting from COVID-19. Some flood control, stormwater erosion, transportation, and other important projects may not be able to move forward because the new rule takes away the permitting path needed to ensure environmental protection and project development. That’s a problem that we need to fix.” said John Putnam, Environmental Programs Director, Colorado department of public health and Environment.

The new 2020 rule does not include many ephemeral streams or wetlands without a surface connection. The lawsuit states that the new, narrower definition of the types of water protected under the Clean Water Act eliminates federal jurisdiction over a significant number of Colorado’s tributaries, adjacent waters, and wetlands that affect downstream waters, without providing any rational basis for the rule. This leaves Colorado’s snowmelt streams and wetlands vulnerable to pollution, which would negatively impact our state’s agriculture and outdoor recreation economy.

Through the lawsuit, Colorado is asking the court to maintain the definition in place since the 1980s and to stop the new, unlawful rule from going into effect. In so doing, Colorado is following up on its comment to the agencies, which praised earlier 2008 guidance as legally sound and grounded in science.  Maintaining the status quo will also protect important agriculture exemptions, respect state authority to administer water rights, and provide the appropriate level of federal partnership.