Off-Grid Laws in Connecticut

I've been digging into what "off-grid" actually means legally in Connecticut, and the short version is: there's no single Connecticut off-grid law. Connecticut is a home-rule state, which means the state sets baseline codes (the Public Health Code and the State Building Code), but your town is the one deciding what you can actually build and how you can live on your land. There's no county land-use layer here at all, just the state and 169 individual towns/cities. So everything below has to be read with an asterisk: confirm with your specific town.

Zoning and raw land. Connecticut has no statewide zoning code. Each municipality writes its own zoning regulations under the state's Zoning Enabling Act, covering lot size, dwelling placement, accessory dwelling units, and whether you can just live on bare land in an RV or tiny structure. This is genuinely one of the most town-by-town variable things about Connecticut, so I can't give a blanket answer; you have to call your town's zoning office.

Tiny homes, dwellings, RVs. The State Building Code (administered by the CT Department of Administrative Services) does recognize and permit tiny homes up to 400 square feet (a 20-by-20 footprint). That's a technical allowance, though, not a permission slip to live in one full-time anywhere you want. Whether a tiny house can be your primary year-round residence, an ADU, or has to sit on a foundation is entirely a local zoning call, and towns differ; some allow full-time tiny living, some don't.

Building permits. Connecticut has adopted an ICC-based State Building Code (the 2018 edition with amendments as of my research), but permits and inspections are issued and enforced by your local building department, not the state directly.

Septic and composting toilets. This is state-regulated but locally administered. The Department of Public Health's Public Health Code (Section 19-13-B103 and related subsections) governs sewage disposal design. Systems with design flows up to 7,500 gallons per day are permitted by your local Director of Health; anything larger (2,000 to 7,500 GPD) needs DPH plan approval. Composting or incinerating toilets aren't automatically legal everywhere; the local health director has to approve them case by case, typically for replacing a failing system or a privy, and only after the lot's been tested and found suitable for a conventional septic system as a backup. Waste from composting toilets has to be disposed of by burial or another method the local health director signs off on.

Greywater. As of my research, Connecticut doesn't have a dedicated greywater code or statute. DEEP has produced a large water-reuse policy document that touches on the subject, but there's no specific household greywater permitting framework I could find. If your greywater system connects to or affects a septic system, your local health director's oversight still applies through the Public Health Code.

Rainwater harvesting. Good news here: it's clearly legal in Connecticut, and the State Building Code actually addresses it directly in Section 1303 (Nonpotable Rainwater Collection and Distribution Systems), under Chapter 13. You'll still need a permit to install or repair a rainwater harvesting system, but there's no ambiguity about legality. DEEP also puts out guidance encouraging the practice.

Wells. Well construction standards come from the state, specifically Public Health Code Sections 19-13-B51(a) through (m), but oversight happens locally. New wells require water quality testing before they go into service, reviewed by the local health director. There's no state-level physical inspection after drilling, and Connecticut doesn't currently require ongoing maintenance testing for private wells; that responsibility falls on the owner.

Going off-grid entirely. There's no state law that bans disconnecting from the grid outright. But practically speaking, most towns won't issue a certificate of occupancy without proof of safe well water and a code-compliant sewage system, and state law allows a health department to withhold that certificate if water quality tests come back unsafe. Electrical disconnection isn't separately regulated, but you can't dodge the water and sewage requirements just because you're off the power grid.

Bottom line: Connecticut's framework is workable for off-grid living, especially on rainwater and septic, but zoning and occupancy questions are won or lost at your town hall, not in Hartford. Call before you build.