Off-Grid Laws in New Hampshire

I've spent a fair amount of time digging through New Hampshire's statutes and agency guidance to sort out what "going off-grid" actually looks like here legally, and the short version is: New Hampshire is friendlier to this lifestyle than most New England states, but almost everything runs through your town, not the state capital. Let me walk through what I found.

Zoning is a local game, full stop. RSA 674, the state's planning and zoning enabling statute, hands zoning authority to individual municipalities. New Hampshire itself doesn't zone your land, your town does, so whether you can live on raw land in a camper, build a small cabin, or run an off-grid homestead depends entirely on that town's ordinance. The one recent statewide intervention is a 2025 accessory dwelling unit (ADU) mandate requiring towns to allow at least one ADU per single-family lot, which matters if you're thinking about a small secondary structure. Beyond that, confirm setbacks, minimum square footage, and raw-land occupancy rules with your specific town's planning or zoning office.

Tiny homes and RVs get treated differently. From what I found, tiny houses on wheels are generally classified as RVs in New Hampshire, which means they're typically restricted to campgrounds or RV parks unless your town has specifically opted to allow them as ADUs. Tiny homes on permanent foundations go through the ADU pathway under RSA 674:71-73, with your town setting the specifics. There's been legislative activity (bills like HB1068/SB482) aimed at tiny-house occupancy standards, but I'd verify with your town what's actually been adopted locally before assuming anything is settled statewide.

Building codes exist at the state level, but enforcement is optional for towns. New Hampshire has adopted a statewide building and fire code under RSA 155-A, but RSA 155-A:2, III reserves the actual issuance of permits and collection of fees for counties, towns, cities, and village districts, and only where those governments have chosen to authorize it. So the code exists on paper everywhere, but whether a building inspector shows up depends on whether your town has adopted an enforcement mechanism.

Septic and composting toilets fall under NH DES, with some local flexibility. The Department of Environmental Services' Subsurface Systems Bureau administers subsurface wastewater rules under Env-Wq 1000 statewide. On the composting/portable toilet front, DHHS guidance acknowledges portable toilets as an acceptable temporary waste solution, distinct from an old-fashioned outhouse, and state campground law explicitly recognizes self-composting and incinerating toilets as acceptable facilities. For permanent year-round residential use outside a campground context, I did not find a clean statewide standard for composting toilets as a septic substitute, this is the kind of thing your local health officer and DES will want to weigh in on case by case.

Greywater reuse is genuinely unclear. I could not find a dedicated New Hampshire statute or DES rule governing residential greywater reuse. DES water-reuse guidance I found focuses on treated municipal effluent for irrigation, not household greywater systems. Treat this as unconfirmed and ask DES directly before building a greywater system.

Rainwater harvesting is permitted for indoor non-potable uses. New Hampshire's adopted building and plumbing codes (2018 Residential Code Chapter 29 and Plumbing Code Chapter 13) cover rainwater harvesting standards for non-potable indoor applications. Outdoor collection for garden use doesn't appear to be separately regulated.

Private wells are licensed at the state level. The NH Water Well Board, under RSA 482-B and its We 100-1000 rules, licenses well drillers and pump installers and sets construction standards, including setback requirements I found cited as 75 feet from contamination sources and property lines and 50 feet from surface water. There's no separate state drilling permit for a private domestic well, but the well contractor must file a Well Record with DES within a set window after drilling.

Living off-grid utility-wise isn't banned by the state. I found no statewide law that forces you to connect to public water or sewer. That said, local health ordinances and subdivision regulations can require hookups in some towns, and some legislative proposals have floated requiring well/septic service for permanent occupancy of tiny homes. This is squarely a "call your town" question.

The throughline here: New Hampshire sets the floor (building code text, well licensing, septic rules) but your town decides how much of that floor actually gets enforced, plus its own zoning layer on top. Nothing here should replace an actual conversation with your town's zoning and building offices before you buy land or break ground.