Environmental groups sue EPA over Iowa river delisting dispute
Environmental groups are suing the EPA for removing polluted Iowa rivers from the impaired waters list.
Why it matters: The outcome could shape Clean Water Act enforcement, affecting regulatory obligations for corporations and municipalities managing water resources. Iowa's challenge spotlights broader questions around environmental agency decision-making and public health protections.
- On May 14, 2026, three environmental organizations filed suit against the EPA in federal court in Des Moines.
- The suit challenges the EPA's July 2025 decision to remove seven Iowa river segments from the impaired waters list.
- The river segments provide drinking water for hundreds of thousands and have documented nitrate contamination.
- The EPA’s decision followed opposition from the Iowa Farm Bureau and raises significant compliance questions.
Three environmental groups—Food & Water Watch, Iowa Environmental Council, and the Environmental Law & Policy Center—filed a lawsuit on May 14, 2026 in Des Moines, seeking a court review of the U.S. Environmental Protection Agency's handling of Iowa’s impaired waters list.
- The lawsuit targets the EPA’s July 2025 decision to delist seven river segments—parts of the Cedar, Des Moines, Iowa, Raccoon, and South Skunk rivers—previously flagged for exceeding federal nitrate safety limits.
- Nitrate contamination, linked to health risks like thyroid disorders and colorectal cancer, has been an ongoing concern, especially since these water sources serve hundreds of thousands of Iowans.
- EPA’s delisting move came after a July 2025 meeting with the Iowa Farm Bureau, which had opposed categorizing the rivers as impaired.
- Environmental advocates allege this action violates the Clean Water Act, undermining necessary regulatory scrutiny. Michael Schmidt, general counsel at the Iowa Environmental Council, stated, "Pretending the problem doesn't exist is not a legal option. EPA needs to protect Iowans and follow the Clean Water Act by acknowledging that nitrate contaminates drinking water sources across the state."
- Iowa now ranks second in national cancer rates and is among only three states with rising cancer incidence. Over 80% of nitrates in the Des Moines and Raccoon Rivers originate from industrial agriculture, intensifying compliance and remediation concerns for local governments and agribusinesses.
The litigation spotlights the consequences of regulatory rollback and the tension between agricultural stakeholders and public health obligations.
By the numbers:
- 7 — Number of Iowa river segments delisted by the EPA in July 2025
- Over 80% — Portion of nitrates in Des Moines and Raccoon Rivers from industrial agriculture
- 2nd — Iowa's rank among U.S. states in overall cancer rate