Off-Grid Living in Mendon, Massachusetts

I've been digging into what off-grid living actually looks like in Mendon, Massachusetts, and the short version is: this is a zoned town, and every layer of that zoning matters if you're thinking about living independent of municipal utilities here.

Zoning and land use. Mendon has an adopted Zoning By-Law maintained by the Planning Board, with enforcement running through the Building Department. The town has multiple residential and business districts, so what you can do with a piece of land depends heavily on which district it sits in. There's no "unzoned" corner of Mendon to fall back on, so I'd start any land search by confirming the district with the Planning Board.

Dwellings, tiny homes, RVs. Mendon is actively revising its bylaw around Accessory Dwelling Units, which tells me the town is paying close attention to dwelling-unit rules generally. I did not find anything in the official record addressing whether an RV or tiny home can serve as a permanent, year-round residence, so that's a genuine open question, one to bring straight to the Building Department or Planning Board before you commit.

Building permits. The Building Department handles building, electrical, plumbing, and gas permits, and per the town's own guidance, a copy of the approved permit, plot plan, and house plans need to stay on-site through final inspection. No occupancy permit gets issued without that paperwork, so plan for a fairly conventional permitting process even if your build is unconventional.

Septic and composting toilets. This is where state and local rules really overlap. The Board of Health enforces Title 5 of the Massachusetts Environmental Code, and Mendon's own zoning by-law goes further, requiring Board of Health sanitary approval before any dwelling gets built at all, and before anything is built on an unsewered street. There's also a rule that keeps sewage disposal works at least 100 feet from any well, per the Board's regulations. Composting toilets fall under a Title 5 waiver process, which the Board of Health administers, so don't assume you can skip septic approval just by going composting.

Greywater. I couldn't find a Mendon-specific bylaw carving out separate rules for greywater reuse. As far as I can tell, it gets folded into the same Title 5 / Board of Health septic framework, meaning the state baseline applies here rather than any local liberalization.

Rainwater harvesting. Nothing in the official Mendon record addresses this directly, town or state. I'd call it unconfirmed, and I'd ask the Board of Health directly if you're planning a rainwater catchment system tied to household use.

Wells. Private wells are permitted, but they run through the Board of Health, which administers well permit applications under state law (M.G.L. Chapter 111 §31) and is currently amending its own private well regulations. Worth checking where that amendment process stands before you finalize plans.

Living off-grid generally. Nothing in Mendon's bylaws bans disconnecting from utilities outright, but you can't legally occupy a home without Board of Health sanitary approval for water and sewage, plus Building Department code sign-off. So "off-grid" in Mendon means self-sufficient infrastructure that still gets inspected and approved, not infrastructure that goes around the system entirely.

Bottom line: Mendon isn't hostile to off-grid living, but it's not a place where you can quietly skip permits either. Every dimension routes back through either the Planning Board, the Building Department, or the Board of Health.