| Alabama | RESTRICTED | Composting toilets may be used in Alabama but typically only as a supplemental system alongside a conventional toilet. I... |
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| Alaska | LEGAL | Composting toilets are explicitly permitted in Alaska under state plumbing or health codes. Wastewater disposal regulati... |
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| Arizona | LEGAL | Composting toilets are explicitly permitted in Arizona under state plumbing or health codes. Arizona has a well-establis... |
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| Arkansas | LEGAL | Composting toilets are explicitly permitted in Arkansas under state plumbing or health codes. No significant legislative... |
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| California | RESTRICTED | Composting toilets may be used in California but typically only as a supplemental system alongside a conventional toilet... |
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| Colorado | LEGAL | Composting toilets are explicitly permitted in Colorado under state plumbing or health codes. No significant legislative... |
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| Connecticut | RESTRICTED | Composting toilets may be used in Connecticut but typically only as a supplemental system alongside a conventional toile... |
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| Delaware | RESTRICTED | Composting toilets may be used in Delaware but typically only as a supplemental system alongside a conventional toilet. ... |
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| Florida | LEGAL | Composting toilets are explicitly permitted in Florida under state plumbing or health codes. No significant legislative ... |
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| Georgia | LEGAL | Composting toilets are explicitly permitted in Georgia under state plumbing or health codes. No significant legislative ... |
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| Hawaii | RESTRICTED | Composting toilets may be used in Hawaii but typically only as a supplemental system alongside a conventional toilet. Wh... |
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| Idaho | LEGAL | Composting toilets are explicitly permitted in Idaho under state plumbing or health codes. No significant legislative ch... |
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| Illinois | LEGAL | Composting toilets are explicitly permitted in Illinois under state plumbing or health codes. No significant legislative... |
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| Indiana | RESTRICTED | Composting toilets may be used in Indiana but typically only as a supplemental system alongside a conventional toilet. N... |
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| Iowa | RESTRICTED | Composting toilets may be used in Iowa but typically only as a supplemental system alongside a conventional toilet. Hous... |
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| Kansas | RESTRICTED | Composting toilets may be used in Kansas but typically only as a supplemental system alongside a conventional toilet. No... |
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| Kentucky | RESTRICTED | Composting toilets may be used in Kentucky but typically only as a supplemental system alongside a conventional toilet. ... |
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| Louisiana | RESTRICTED | Composting toilets may be used in Louisiana but typically only as a supplemental system alongside a conventional toilet.... |
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| Maine | LEGAL | Composting toilets are explicitly permitted in Maine under state plumbing or health codes. A 2022 law prohibiting the la... |
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| Maryland | RESTRICTED | Composting toilets may be used in Maryland but typically only as a supplemental system alongside a conventional toilet. ... |
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| Massachusetts | LEGAL | Composting toilets are explicitly permitted in Massachusetts under state plumbing or health codes. No significant legisl... |
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| Michigan | RESTRICTED | Composting toilets may be used in Michigan but typically only as a supplemental system alongside a conventional toilet. ... |
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| Minnesota | RESTRICTED | Composting toilets may be used in Minnesota but typically only as a supplemental system alongside a conventional toilet.... |
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| Mississippi | RESTRICTED | Composting toilets may be used in Mississippi but typically only as a supplemental system alongside a conventional toile... |
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| Missouri | RESTRICTED | Composting toilets may be used in Missouri but typically only as a supplemental system alongside a conventional toilet. ... |
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| Montana | LEGAL | Composting toilets are explicitly permitted in Montana under state plumbing or health codes. No significant legislative ... |
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| Nebraska | RESTRICTED | Composting toilets may be used in Nebraska but typically only as a supplemental system alongside a conventional toilet. ... |
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| Nevada | RESTRICTED | Composting toilets may be used in Nevada but typically only as a supplemental system alongside a conventional toilet. No... |
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| New Hampshire | LEGAL | Composting toilets are explicitly permitted in New Hampshire under state plumbing or health codes. NHDES updated its reg... |
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| New Jersey | RESTRICTED | Composting toilets may be used in New Jersey but typically only as a supplemental system alongside a conventional toilet... |
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| New Mexico | LEGAL | Composting toilets are explicitly permitted in New Mexico under state plumbing or health codes. No significant legislati... |
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| New York | RESTRICTED | Composting toilets may be used in New York but typically only as a supplemental system alongside a conventional toilet. ... |
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| North Carolina | RESTRICTED | Composting toilets may be used in North Carolina but typically only as a supplemental system alongside a conventional to... |
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| North Dakota | RESTRICTED | Composting toilets may be used in North Dakota but typically only as a supplemental system alongside a conventional toil... |
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| Ohio | RESTRICTED | Composting toilets may be used in Ohio but typically only as a supplemental system alongside a conventional toilet. No s... |
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| Oklahoma | RESTRICTED | Composting toilets may be used in Oklahoma but typically only as a supplemental system alongside a conventional toilet. ... |
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| Oregon | LEGAL | Composting toilets are explicitly permitted in Oregon under state plumbing or health codes. No significant legislative c... |
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| Pennsylvania | LEGAL | Composting toilets are explicitly permitted in Pennsylvania under state plumbing or health codes. No significant legisla... |
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| Rhode Island | RESTRICTED | Composting toilets may be used in Rhode Island but typically only as a supplemental system alongside a conventional toil... |
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| South Carolina | RESTRICTED | Composting toilets may be used in South Carolina but typically only as a supplemental system alongside a conventional to... |
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| South Dakota | RESTRICTED | Composting toilets may be used in South Dakota but typically only as a supplemental system alongside a conventional toil... |
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| Tennessee | LEGAL | Composting toilets are explicitly permitted in Tennessee under state plumbing or health codes. No significant legislativ... |
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| Texas | LEGAL | Composting toilets are explicitly permitted in Texas under state plumbing or health codes. No significant legislative ch... |
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| Utah | RESTRICTED | Composting toilets may be used in Utah but typically only as a supplemental system alongside a conventional toilet. No s... |
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| Vermont | LEGAL | Composting toilets are explicitly permitted in Vermont under state plumbing or health codes. No significant legislative ... |
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| Virginia | RESTRICTED | Composting toilets may be used in Virginia but typically only as a supplemental system alongside a conventional toilet. ... |
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| Washington | LEGAL | Composting toilets are explicitly permitted in Washington under state plumbing or health codes. No significant legislati... |
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| West Virginia | RESTRICTED | Composting toilets may be used in West Virginia but typically only as a supplemental system alongside a conventional toi... |
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| Wisconsin | RESTRICTED | Composting toilets may be used in Wisconsin but typically only as a supplemental system alongside a conventional toilet.... |
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| Wyoming | LEGAL | Composting toilets are explicitly permitted in Wyoming under state plumbing or health codes. No significant legislative ... |
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