Off-Grid Living in Middlesex County, New Jersey

Middlesex County, New Jersey is a tricky place to research off-grid living because, structurally, the county itself has almost no zoning power. New Jersey's Municipal Land Use Law puts zoning authority in the hands of each town, and Middlesex County has 25 of them, each running its own land use board and zoning ordinance. The Middlesex County Planning Board mostly reviews and receives notice of municipal zoning changes rather than approving or denying them. So the honest first answer to "can I do this here" is: it depends which of the 25 towns you're in, and you need to call that town's zoning office, not the county.

Where the county does step in directly is environmental health, specifically septic systems and private wells, through the Middlesex County Environmental Health Division (MCEHD), which operates under state delegation from NJDEP. Any septic work, new construction, alteration, or even a straight repair/replacement, requires MCEHD approval, and the county explicitly points to state code (N.J.A.C. 7:9A) for the underlying subsurface sewage disposal rules. Composting toilets aren't addressed on the county pages I found, so treat that as unconfirmed and ask MCEHD directly before assuming you can skip a conventional septic permit.

Wells are similarly under active county oversight, again as a state delegate. MCEHD's Water Pollution Program handles well certifications and inspections, and any new well drilling or old well decommissioning must be done by an NJDEP-licensed driller, who has to notify the county in advance to schedule inspection. New wells get tested under the state's Private Well Testing Act, with results reviewed by MCEHD before a certificate of compliance is issued. Middlesex is also one of the New Jersey counties where uranium testing is state-mandated for wells, which isn't universal statewide, so don't assume your out-of-county research applies here.

Building permits are issued locally by each municipality's own Uniform Construction Code (UCC) enforcing agency, but the county maintains a Construction Board of Appeals if you want to contest a local building department's decision.

Greywater reuse and rainwater harvesting rules simply weren't findable at the county or state level in my research; nothing official addresses residential greywater or rain barrels/cisterns specifically for this county. I'd treat greywater as folded into the septic/subsurface disposal rules until MCEHD says otherwise, and ask before installing any greywater system.

On full utility disconnection: I found no county rule mandating a hookup to public electric, gas, water, or sewer. But practically, getting a municipal Certificate of Occupancy under the UCC generally requires an approved water supply and sewage method, meaning a legally occupied home basically needs either a permitted well/septic or municipal service, permitted through MCEHD as above. Tiny homes, RVs, and alternative dwellings are entirely municipal calls, town by town, so check your specific zoning ordinance before assuming anything.