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HB 664

Repeal numeric nutrient standards

2025 Regular Session Introduced by Bill Mercer

Montana repeals numeric limits on nitrogen and phosphorus pollution in state waters, eliminating quantitative discharge standards for nutrient contamination.

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Bill Summary · HB 664

Legislative bill overview

HB 664 repeals Montana's numeric nutrient standards—quantitative limits on nitrogen and phosphorus pollution in state waters. These standards were established to protect water quality and prevent algal blooms and eutrophication. The bill eliminates the specific numerical thresholds that regulated how much of these nutrients could be discharged into rivers, lakes, and streams.

Why is this important

Numeric nutrient standards are a key tool for managing water pollution and protecting aquatic ecosystems and public health. Removing them eliminates specific accountability measures for industrial facilities, agricultural operations, and wastewater treatment plants that discharge nutrients into Montana waters. This could affect drinking water quality, recreational water use, and ecosystem health in affected waterways.

Potential points of contention

  • Environmental protection vs. regulatory burden: Environmental advocates argue standards are necessary for water quality, while opponents claim they impose costly compliance requirements on agriculture and industry without proportional benefit
  • Federal vs. state authority: EPA maintains authority over water quality under the Clean Water Act; repealing state standards may create regulatory gaps or trigger federal intervention
  • Agricultural impact: Montana's agricultural sector may benefit from reduced regulations, but downstream states and water users could face degraded water quality and higher treatment costs

Compiled from official sources — confirm details with the bill’s official record.

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