Montana Animal Waste Disposal Laws: What Livestock Owners Must Know
October 19, 2026
If you raise cattle, sheep, goats, or poultry in Montana, manure and dead animals are two of the quietest legal liabilities on any operation. Montana animal waste disposal laws treat these as separate problems entirely, splitting authority between the Department of Livestock, the Department of Environmental Quality (DEQ), and your county government. Get the wrong agency’s rule wrong, and you could face civil penalties, a stalled permit, or a demand to redo months of recordkeeping.
What surprises many landowners is that you cannot always dispose of a dead animal or manure however you like, even on your own property. State law draws hard lines around highways, waterways, and public land, and those lines apply whether you run five goats or a thousand head of cattle. This breakdown walks through what you must do for storage, land application, carcass disposal, water protection, CAFO permitting, and penalties, plus how to verify the rules directly with the agencies that enforce them.
What Montana Requires for Livestock Waste and Dead-Animal Disposal
Montana runs two separate legal tracks that both apply to you at once. The first is a general nuisance and solid-waste law under Title 75 of the Montana Code Annotated, and the second is a livestock disease-control rule enforced by the Department of Livestock.
It is unlawful to dump or leave any garbage, dead animal, or other debris in or upon any highway, road, street, or alley, on public property under state or local control, or within 200 yards of a public highway or public property. The law also bars dumping on privately owned land where hunting, fishing, or other recreation is permitted, unless the owner or the owner’s agent consents. That last clause matters if you lease grazing or hunting access on your land, since consent from you does not automatically extend to a neighbor’s property.
Separately, the Department of Livestock’s administrative rule on carcass disposal requires that carcasses of animals that have died from causes other than anthrax be disposed of in a satisfactory manner that meets the residential county solid waste disposal requirements. The same rule adds that carcasses may not be disposed of along public highways, streams, lakes, or rivers, or allowed to remain on the ground so as to become a public nuisance to livestock, wildlife, or other animals. These rules apply regardless of species, so a small herd owner working through goat ownership laws in Montana faces the same disposal standard as a large cattle operation.
If your animals wander before any of this becomes relevant, the disposal rules intersect with liability questions covered in our guide to cattle trespass laws in Montana, since a carcass on someone else’s land raises both nuisance and trespass issues at the same time.
Manure Storage, Stockpiling, and Land-Application Rules in Montana
For operations large enough to need a state discharge permit, manure storage and land application are governed by DEQ’s CAFO General Permit and its supporting guidance, DEQ Circular 9. Storage facilities must be built to hold more than routine runoff. Facilities must account for the 24-hour, 25-year storm event and the volume of the critical storage period when calculating required holding capacity.
Land application isn’t a simple “spread it and move on” activity, either. When manure or process wastewater is applied to a field with a higher-risk Phosphorus Site Index rating, a visual inspection of the downgradient edge of the field and other potential discharge locations must be conducted during the application event and again afterward to check for runoff and discharges.
Recordkeeping backs all of this up. According to Montana State University Extension’s guidance on the permit, producers must maintain records on-site for at least five years, including a copy of the site-specific Nutrient Management Plan and current design specifications for manure and litter storage. If you sell or give away manure, MSU Extension notes that its publication on using manure as fertilizer is intended for distribution by CAFO owners to recipients of their manure products, which doubles as documentation that you disclosed nutrient content.
Pro Tip: Keep five years of storage and application records even before you cross a CAFO threshold. Herds grow, and reconstructing two or three years of history after a DEQ inspection request is far harder than keeping a simple log from day one.
Smaller operations aren’t exempt from thinking about this. Anyone stockpiling manure from a mixed flock, including the kind of setup described in our backyard chicken laws in Montana guide, should apply the same nuisance and runoff logic even without a permit requirement, since county nuisance ordinances can still apply. If you’re moving manure or bedding between properties as part of a larger operation, that overlaps with the rules in our transporting livestock laws in Montana article.
How You Must Dispose of Dead Livestock Carcasses in Montana
The carcass rule under ARM 32.4.1002 is short but strict. Outside of anthrax cases (which the Department of Livestock handles under separate disease-response protocols), you must dispose of a dead animal in a way that satisfies your county’s solid waste disposal requirements, and you may never leave it along a highway, stream, lake, or river, or let it sit until it becomes a nuisance.
In practice, that means most producers use one of a few accepted routes:
- Delivery to a permitted landfill or transfer station that accepts animal carcasses
- Rendering or pickup services where available in your county
- On-site burial, where county health regulations permit it and groundwater depth allows
- Composting facilities that meet county solid waste standards
Because county solid waste requirements vary, what’s acceptable in one Montana county may not be in another, so you need to confirm the specific rule with your local health department before choosing a method. The same underlying “no dumping near water” logic that governs livestock carcasses also shows up in state guidance for hunters, where all carcass parts remaining after processing a game animal should be disposed of in a regulated landfill or at a transfer station, according to Montana Fish, Wildlife & Parks. If you’ve salvaged a road-killed animal, review our roadkill laws in Montana guide, since carcass disposal obligations kick in the moment you take possession.
Which Agency Regulates Manure and Carcass Disposal in Montana
No single Montana agency owns this issue. Instead, jurisdiction splits by the type of waste and where the risk lands.
| Agency | What It Regulates | Key Authority |
|---|---|---|
| Montana Department of Livestock | Carcass disposal from disease standpoint, animal health reporting | ARM Title 32, Chapter 4 |
| DEQ Water Protection Bureau | CAFO permits, manure storage design, land application discharge | MPDES CAFO General Permit |
| County/local health departments | Solid waste disposal standards for carcasses and general refuse | County solid waste ordinances |
| Montana Fish, Wildlife & Parks | Wildlife carcass disposal, dumping on state-managed land | State land use rules |
The General Permit for Concentrated Animal Feeding Operations regulates discharge of manure, process wastewater, and other wastes to state waters from CAFOs, with a CAFO defined as an Animal Feeding Operation that meets certain additional regulatory criteria. On the wildlife side, FWP’s own rules for state land are just as direct: Montana law, applicable on all state-owned and managed sites, prohibits leaving dead animals or refuse on public property, including FWP-managed fishing access sites and wildlife management areas.
If your operation runs alongside hunting access or outfitting, it’s worth reviewing our hunting laws in Montana guide, since carcass disposal obligations for landowners and hunters can overlap on the same parcel of ground.
Water Setbacks, Groundwater Protections, and Health Standards in Montana
Water protection runs through two layers: a blanket setback in the dumping statute, and a more technical monitoring framework inside the CAFO permit. On the blanket side, the 200-yard buffer from public highways and roads under MCA 75-10-212 functions as a de facto water protection, since most rural waterways run near roads.
On the CAFO side, DEQ has told reporters that its permit builds in more targeted tools. A DEQ spokesperson explained that the CAFO General Permit contains monitoring, sampling, and recordkeeping requirements for the entire operation, including the feeding area, waste control facilities, and the land application area, and requires Best Management Practices and a Nutrient Management Plan for regular soil and manure monitoring, with groundwater monitoring required near a facility if any part of the production area constitutes a potential source of pollution to state groundwater.
Important Note: Not everyone agrees this framework goes far enough. Advocacy groups have argued that leaving groundwater monitoring to DEQ’s discretion on a “case-by-case basis” does not satisfy the strict-liability standard of the Clean Water Act and Montana Water Quality Act. If your operation sits near a hydrologically connected waterway, treat discretionary monitoring language in your permit as a minimum, not a ceiling, and document your own soil and water conditions regardless of what DEQ requires.
CAFO and Nutrient Management Plan Requirements in Montana
Whether you need a CAFO permit at all depends on herd size and confinement, not just species. A CAFO is an Animal Feeding Operation that meets additional regulatory criteria based primarily on the number of animals in the confined production area, and may be designated Large or Medium depending on permit thresholds or DEQ’s determination of pollution potential.
Once you’re covered, the permit itself is a federal requirement administered at the state level. Confined Animal Feeding Operations are required to obtain the Montana Pollutant Discharge Elimination System permit, which is a federally required permit administered by the state on behalf of the U.S. Environmental Protection Agency. The EPA confirms the same baseline nationally: all NPDES-permitted CAFOs must implement a Nutrient Management Plan, and non-permitted Large CAFOs must implement nutrient management planning as well.
When you submit your Nutrient Management Plan to DEQ, you choose one of two ways to express land application rates. A Linear Approach expresses application in pounds of nitrogen and phosphorus per acre, while a Narrative Rate Approach expresses application as tons or gallons of manure and process wastewater to be land applied. Each path requires different supporting documentation before DEQ will approve your plan.
Key Insight: The two NMP approaches aren’t interchangeable conveniences; they change what records you must maintain year over year. Talk to a DEQ permit reviewer before your first submission if you’re unsure which approach fits your fields and crop rotation.
Penalties for Illegal Dumping, Missed Carcass Deadlines, and Water Violations in Montana
Montana treats illegal dumping under the general waste statute as a strict-liability offense. A person in violation of the dumping section is absolutely liable and is subject to the civil penalties provided in section 75-10-233. “Absolutely liable” means intent isn’t a defense; if the carcass or refuse ended up in a prohibited location, the violation stands regardless of how it got there.
Carcass-specific violations carry their own consequences that go beyond a simple fine. In the hunting context, which illustrates how seriously Montana treats improper carcass handling, a person convicted of illegally transporting a prohibited carcass or carcass parts into Montana can be fined up to $500 and may face forfeiture of any current hunting, fishing, or trapping license, along with the privilege to hunt, fish, or trap in the state. FWP has made clear it treats this seriously across the board: violations are actively pursued, so there is no gray area when it comes to attractants near deer, elk, or moose habitat.
The public health rationale behind these penalties isn’t abstract. Wildlife biologists point out that illegal carcass disposal creates a disease vector, since prions spread through feces, saliva, and urine remain infectious in the environment for at least two years and likely longer. That same logic underlies why county nuisance officers and DEQ inspectors treat livestock carcass violations, not just wildlife ones, as a public health matter rather than a paperwork issue. If a disposal violation escalates into a broader neglect complaint, it can also intersect with the standards covered in our animal cruelty laws in Montana guide.
How to Confirm Current Montana Animal-Waste Rules With the Agencies
Published summaries of Montana law, including this one, are a starting point, not a final answer. Even official aggregators carry a standing disclaimer: these regulations may not be the most recent version, and Montana may have more current or accurate information. Rule amendments happen through the Montana Administrative Register, and permit terms change when DEQ reissues the CAFO General Permit.
Before you finalize a disposal plan, storage design, or NMP submission, confirm the current requirement directly with the agency that enforces it:
- Montana Department of Livestock — for carcass disposal rules under ARM Title 32 and disease-reporting obligations tied to a death
- DEQ Water Protection Bureau — for CAFO General Permit terms, NOI-NMP forms, and groundwater monitoring requirements
- Your county health or solid waste department — for the specific local standard that ARM 32.4.1002 defers to
- MSU Extension — for practical guidance on records, manure testing, and nutrient budgeting that supports your compliance file
Because county solid waste standards vary and DEQ periodically reissues its general permit, treat any written summary, including agency fact sheets, as accurate only as of its publication date. A short phone call before you build a storage structure or select a carcass disposal method costs far less than correcting a violation after the fact.
Pro Tip: Save the name and date of whoever you spoke with at each agency. If a rule changes later and you were following guidance given in good faith, that record can matter during a compliance review.