Can you drill a well anywhere in Montana?

Three questions, not one

Whether you can put a working well on a property comes down to three separate things, and they can fail independently.

• Is there water there? A hydrogeologic question, best answered by comparable nearby wells and, ultimately, by drilling.
• Are you legally permitted to appropriate it? A regulatory question, governed by controlled groundwater areas, basin closures, and the exempt-well provisions.
• Can you get authorization to proceed? A procedural question — since 2023, a Notice of Intent must be filed with DNRC and authorized before drilling under the exempt provisions.

Controlled groundwater areas

Montana has 21 controlled groundwater areas. Inside one, the normal exempt-well path is unavailable: groundwater may generally be appropriated only under a DNRC permit or under the specific rules that created the area.

They exist for varied reasons. Some are small boundaries drawn around contamination sites — the Bozeman Solvent Site, the Idaho Pole Company site, Butte's alluvial and bedrock areas. Others are very large regional designations, most notably the Powder River Basin. A property can fall inside one without any visible indication on the ground.

Closed basins

Basin closures are the bigger practical constraint for most buyers, simply because of how much land they cover. Montana has 182 closure areas in the state's records, established by legislation, administrative rule, or compact.

Several are enormous and sit under highly desirable country: the Upper Missouri Basin, the Jefferson and Madison basins, the Upper Clark Fork, the Bitterroot, the Teton. Closures restrict new appropriations, with terms that vary from one closure to the next.

Worth noting: some closures in the state record are marked as not yet in force. Those do not restrict appropriation today, but they signal a restriction that is planned or pending — relevant if your plans for a property extend years out. Our reports distinguish between active and pending closures rather than lumping them together, because the difference matters.

What a preliminary assessment can and cannot do

Our reports include an initial well development assessment: whether the property appears likely straightforward, whether additional review is recommended, or whether we have identified a potential regulatory issue. It draws on the controlled groundwater area and closure boundaries, the water rights we can associate with the parcel, existing wells on the property, and subdivision context.

It is decision-support for due diligence, not a determination. It is not a permit, not an approval, and not a legal opinion. Verify with DNRC before drilling — and before waiving a due-diligence contingency on the assumption that water will be available.