Is Composting Toilets Legal in Minnesota? (2026)
Partially — Composting Toilets are legal with restrictions in Minnesota as of 2026.
Quick Answer
Composting toilets may be used in Minnesota but typically only as a supplemental system alongside a conventional toilet. No significant legislative changes have been made to the Subsurface Sewage Treatment System (SSTS) rules.
What the Law Says
Minnesota regulations restrict composting toilets to supplemental use alongside conventional toilets, requiring county health department approval and adherence to local plumbing codes; unauthorized installation may result in code violations enforced by MPCA and local government units.
— Minn. R. 7080.1100
| Category | Details |
|---|---|
| State Plumbing Code | May require conventional toilet as primary; composting as supplemental |
| Permit Requirements | Legal to sell |
| Code Violation Penalties | Installation without permits may result in code violations. |
| Pending Legislation | None known |
No significant legislative changes have been made to the Subsurface Sewage Treatment System (SSTS) rules.
Enforcement Reality
The Minnesota Pollution Control Agency (MPCA) and local government units (LGUs) enforce the rules. Composting toilets are not considered a code-approved plumbing fixture, so their use is limited, typically to existing dwellings where a conventional system is not feasible.
A common mistake is attempting to install a composting toilet in new construction without special approval. Another is failing to have a proper system for greywater, which is still required.
Local Exceptions
None identified. State law applies uniformly across Minnesota. Local ordinances may still vary — check with your city or county government for any additional rules.
Bottom Line
Composting Toilets are legal with restrictions in Minnesota. This activity is permitted, but specific conditions apply. Violating those conditions can result in fines or criminal charges. Read the rules carefully and consult an attorney if unsure.
Minnesota vs. the Rest of the US
Across the US, installing a composting toilet is fully legal in 20 states, restricted in 30, and illegal in 0. Minnesota falls in the RESTRICTED category.
View the full 50-state map →Neighboring States
Laws change at state lines. Here is how bordering states compare on Composting Toilets:
Frequently Asked Questions
Is installing a composting toilet legal in Minnesota?
What are the restrictions on installing a composting toilet in Minnesota?
What mistakes do people make with installing a composting toilet in Minnesota?
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Reviewed by cross-referencing the cited state statute against current legislative databases and regulatory publications.
Sources & Verification
This page was reviewed by Ethan Harper by comparing the legal status against the cited state statute. AllowedHere is an informational resource and does not provide legal advice. Consult a licensed attorney for guidance specific to your situation.
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