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Group Sues the State over Law Used to Bring Water to Rural Subdivisions

The lawsuit challenges Montana’s 1973 exempt well law, citing constitutional harms to senior water rights and over 141,000 wells drilled without regulation, plaintiffs say.

  • On Wednesday, a coalition of six nonprofit groups and three individual water users sued Montana, led by the Montana League of Cities and Towns, asking Lewis and Clark County District Court to block exempt well authorizations.
  • The 1973 Montana statute creating `exempt wells` allowed pumping up to 10 acre-feet without proving impacts, sparking failed efforts like Senate Bill 358 earlier this year.
  • Headwaters Economics' data show there may be 141,000 `exempt wells` authorized since 1973, and DNRC defines them as using 35 gallons per minute or less and not exceeding 10 acre-feet per year.
  • Plaintiffs ask the court to conserve limited water resources and preserve constitutional protections for senior water-right holders, warning fisheries and municipal supplies face threats while DNRC spokesperson declined to comment.
  • Developers have used the exemption to fuel low-density subdivisions outside public water systems, and the suit notes more than half of residential development occurred outside incorporated municipalities, citing Upper Missouri Waterkeeper v. Broadwater County and Judge Michael McMahon's criticism of DNRC's interpretation.
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Missoula Current broke the news in on Wednesday, November 12, 2025.
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