Off-Grid Living in Union County, New Jersey

Union County, New Jersey is about the last place I'd point someone hunting for a cheap off-grid homestead, and I want to be upfront about why before you spend time digging into ordinances. This is one of the most densely developed corners of New Jersey, it's almost entirely sewered and on public water, and there is no countywide zoning authority at all. Everything that matters, land use, dwelling type, permits, is decided town by town among the county's 21 municipalities. Union County government itself mostly plays a coordinating role: the Union County Planning Board keeps copies of local master plans and zoning ordinances and reviews things like subdivisions that touch county roads or drainage, but it doesn't issue permits or set land-use rules for individual lots.

So on zoning and raw-land occupancy, the honest answer is "it varies," because each municipality (Union Township, Westfield, Plainfield, Elizabeth, and so on) runs its own zoning ordinance and construction office. If you're eyeing a specific parcel, your first call needs to be that town's zoning or construction office, not the county.

Dwelling types, including tiny homes and RVs as residences, aren't addressed at the county level either. Union Township's zoning office, for example, administers setbacks, lot coverage, floor area, and height limits, which is fairly typical for a suburban ordinance, but I found nothing confirming RV or tiny-home occupancy rules at either the county or state level. Building permits themselves follow New Jersey's statewide Uniform Construction Code, administered locally by each town's construction office, not the county.

Septic and wells are the interesting wrinkle. Because Union County is so heavily sewered, it doesn't run a dedicated county Environmental Health septic/well program the way more rural counties like Hunterdon or Warren do. Instead, the state's rule applies: local health departments (meaning each municipality's own health office) issue permits for septic systems handling under a certain wastewater volume, and NJDEP generally stays out of it unless you need an Alternative Design Treatment Works Approval. Same story for wells, it's a municipal health department function layered on the state's Private Well Testing Act framework. You'd start with the Union County Health Officers Directory to find the right town contact.

Greywater reuse, rainwater harvesting, and living fully disconnected from utilities are all genuinely unclear here. I could not find a Union County or NJDEP page addressing residential greywater or rain barrels specifically, and the county's stormwater program is aimed at municipal drainage systems, not private catchment. On utility disconnection, the practical hurdle is that a Certificate of Occupancy under the state Uniform Construction Code generally presumes an approved water supply and sewage disposal method, which makes truly "off-grid" living hard to square with occupancy rules in a place this urbanized.

Bottom line: treat Union County as inheriting New Jersey's state baseline on septic, wells, and construction, with the real decision-making happening in whichever of the 21 towns you're looking at.