Congress quietly shrinks federal water-pollution authority over groundwater and seasonal streams
S. 2421 — CLEAR Waters Act · Filed by Joni Ernst (R-IA) · 6 cosponsors · Introduced Jul 23, 2025 · Referred to committee
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What it does
This bill narrows the federal definition of 'navigable waters' under the Clean Water Act by explicitly excluding waste treatment systems, ephemeral streams (those that flow only after rain), groundwater, and any other features the EPA Administrator and Army Corps of Engineers jointly decide to exclude. The effect is to remove federal pollution-control jurisdiction from these water bodies, allowing states and private parties to manage them with less federal oversight.
Why we flagged it
The bill's operative mechanism is to carve out entire categories of water bodies from federal Clean Water Act jurisdiction. While framed as a 'clarification,' it functionally narrows EPA and Army Corps authority and shifts pollution control to state/local bodies or removes it entirely, benefiting industries that discharge into those waters.
What the text implies
- Subsection (B)(iv) grants the EPA Administrator and Army Corps Chief of Engineers joint authority to exclude 'any other features' without congressional approval, creating a delegated rulemaking power that could expand exclusions far beyond the four named categories.
- Ephemeral streams (subsection ii) often recharge aquifers and feed into downstream navigable waters; excluding them may allow upstream pollution that degrades drinking-water sources and violates downstream Clean Water Act protections.
The full analysis lists 5 implications of this text.
Who stands to gain
agricultural operations (reduced oversight of irrigation runoff and treatment ponds); industrial manufacturers (reduced federal pollution limits on discharge systems); mining and energy companies (reduced jurisdiction over ephemeral streams and groundwater contaminati