Are Composting Toilets Legal in Maine? (2026)
Yes — Composting Toilets are legal in Maine as of 2026.
Law changed in 2022: A 2022 law prohibiting the land application of biosolids (sludge) has increased scrutiny on all forms of human waste composting, although it does not directly regulate composting toilets.
Quick Answer
Composting toilets are explicitly permitted in Maine under state plumbing or health codes. A 2022 law prohibiting the land application of biosolids (sludge) has increased scrutiny on all forms of human waste composting, although it does not directly regulate composting toilets.
What the Law Says
Permits the use, sale, and installation of composting toilets in Maine, requiring units to typically meet NSF 41 certification and comply with state health department regulations, including proper disposal of composted waste.
— 10-144 C.M.R. ch. 241, § 4(M)
| Category | Details |
|---|---|
| State Plumbing Code | Legal; NSF 41 certified units typically required |
| Permit Requirements | Legal to sell and install |
| Code Violation Penalties | Must meet state health department requirements. |
| Pending Legislation | None known |
A 2022 law prohibiting the land application of biosolids (sludge) has increased scrutiny on all forms of human waste composting, although it does not directly regulate composting toilets.
Enforcement Reality
Enforcement is handled by the Maine Department of Health and Human Services, Division of Environmental Health. Permits are required for all alternative toilets, and disposal of the composted material is strictly regulated.
A common mistake is not obtaining a permit before installation. Another is the improper disposal of the composted material, which must be buried on-site or handled by a licensed seepage hauler.
Local Exceptions
None identified. State law applies uniformly across Maine. Local ordinances may still vary — check with your city or county government for any additional rules.
Bottom Line
Composting Toilets are legal in Maine. You can installing a composting toilet without violating state law, though federal rules and local ordinances may still apply. Always verify current law before acting.
Maine 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. Maine falls in the LEGAL category.
View the full 50-state map →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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