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DEQ and river advocacy group spar over water quality standards for nutrients

The EPA's approval lets Montana use narrative nutrient standards, allowing tailored local water quality plans despite concerns over delayed pollution responses.

  • On Oct. 6, DEQ announced the Environmental Protection Agency signed off on Montana's shift from numeric to narrative nutrient standards after Gov. Greg Gianforte signed House Bill 664 in May.
  • Scientists note nutrient pollution and warmer, low-flow summers have driven renewed urgency as numeric water quality standards offer measurable limits, unlike narrative standards that react after pollution events.
  • Upper Missouri Waterkeeper said it is reviewing the EPA decision and alleged Montana Department of Environmental Quality issued permits without numeric limits, stalling Clean Water Act implementation.
  • DEQ said narrative criteria let the agency tailor assessments and permits to watersheds, Nowakowski said the EPA nod allows permitting and planning to proceed, and Cyrus Western said House Bill 664 meets federal standards.
  • Montana anglers generated $1.27 billion in spending in 2024, underlining economic stakes as conservation groups warned the rollback is a step backward amid algal blooms lowering dissolved oxygen.
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The Billings Gazette broke the news in Billings, United States on Thursday, October 9, 2025.
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