Is Composting Toilets Legal in Illinois? (2026)
Yes — Composting Toilets are legal in Illinois as of 2026.
Quick Answer
Composting toilets are explicitly permitted in Illinois under state plumbing or health codes. No significant legislative changes have occurred since the last update to the Private Sewage Disposal Code.
What the Law Says
Illinois law permits the use and sale of composting toilets as primary or supplemental systems, requiring compliance with state health codes and typically NSF Standard 41 certification; enforcement is managed by local health departments with some counties imposing stricter rules.
— Ill. Admin. Code tit. 77, § 905.130
| 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 |
No significant legislative changes have occurred since the last update to the Private Sewage Disposal Code.
Enforcement Reality
Enforcement is handled by local health departments under the Illinois Department of Public Health. Some counties, like South Barrington, have explicitly prohibited composting toilets.
A common mistake is not checking local county ordinances, which can be more restrictive than state law. Another is failing to use an NSF Standard 41 certified unit where required.
Local Exceptions
None identified. State law applies uniformly across Illinois. Local ordinances may still vary — check with your city or county government for any additional rules.
Bottom Line
Composting Toilets are legal in Illinois. 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.
Illinois 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. Illinois falls in the LEGAL 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 Illinois?
Can you install a composting toilet in Illinois?
Does the law on installing a composting toilet change at the Illinois border?
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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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