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Upper Missouri Waterkeeper, Inc. leverages a combination of strong science, community action, and the law to defend fishable, swimmable, drinkable water throughout the 25,000 square miles of Montana’s Upper Missouri River Basin.
We actively engage with citizens, stakeholders and decisionmakers, utilize best-available science and, when necessary to protect waterways and communities, insist on compliance with the law.
Fishable, swimmable, drinkable water – your right, our mission.
Upper Missouri Waterkeeper defends clean water throughout the 25,000 square miles of Montana's Upper Missouri River Basin.
Join us today!
What is eutrophication?“Eutrophication” is the fancy scientific word describing the over-saturation of a waterbody with nutrients, including nitrogen and phosphorus, resulting in unhealthy ecological conditions. Excess nutrients can fuel algae and plant growth, which reduces oxygen and creates conditions harmful…
One exception to rule them all, One exception to find them, One exception to bring them all and in the darkness bind them. Montana Water Policy Interim Committee Update Nearing the end of the interim, Montana’s Water Policy Interim Committee (WPIC)…
The Montana Department of Environmental Quality (DEQ) is seeking public comments on the Draft Eutrophication Assessment Method for Wadeable Streams and Medium Rivers. “Eutrophication” is the fancy scientific word describing the over-saturation of a waterbody with nutrients, including nitrogen and…
Upper Missouri Waterkeeper recently took legal action against the Montana Department of Environmental Quality (DEQ) to protect the Big Hole River from new mining activities at the Calvert Tungsten Mine. DEQ approved a Small Miner Exclusion Statement (SMES) to Mithril…
Montana’s Water Quality Integrated Report remains under federal review as politics override science On Wednesday, July 15, 2026, Upper Missouri Waterkeeper filed a 60-day Notice of Intent to Sue to the Environmental Protection Agency (EPA) for its failure to take…
Waterkeeper’s Science and Advocacy Lead DEQ to Long-Overdue Big Hole River Protections; Concerns About Pollutants Driving Algal Blooms Remain At a Big Hole River Open House last night in Divide, the Montana Department of Environmental Quality (DEQ) shared that it…
Motion Requests FWP Explain Refusal to Call Senior Instream Flow Right Last week, Upper Missouri Waterkeeper, Alliance for the Wild Rockies, and Save the Bull Trout filed an emergency motion for preliminary injunction asking the Lewis and Clark County District…
EPA failed to act on revisions to pH, Dissolved Oxygen, and Ammonia Assessment Methods Yesterday, Upper Missouri Waterkeeper and the Montana Environmental Information Center (MEIC) filed a 60-day Notice of Intent to Sue the Environmental Protection Agency (EPA) for its…
Decision highlights County’s responsibility to prevent harm to groundwater, Hyalite Creek, and neighbors Today, Tuesday, July 14, the Gallatin County Commission voted to deny the preliminary plat application for the proposed Anderson Meadows Major Subdivision, a 22-lot development south of Bozeman…
