Off-Grid Living in Los Alamos County, New Mexico

Los Alamos County is an odd duck among New Mexico counties, and if you're dreaming of quietly homesteading off-grid here, I want to be upfront: this is probably one of the harder places in the state to do it. Los Alamos is a home-rule county under Article X of the New Mexico Constitution, and it acts more like a small city-county than a rural county. Nearly the whole populated footprint (the Los Alamos townsite and White Rock) is on the county's own water and wastewater utility, run by the Department of Public Utilities, and the county has a full Development Code with a comprehensive zoning map. There's no "unzoned raw land" loophole to exploit like you'd find in many other NM counties.

Zoning: Every parcel falls into a mapped zone district under Chapter 16 of the county code, administered by the Community Development Department. The Residential Agricultural (RA) district is the closest thing to a rural-lifestyle zone, aimed at low-density single-family and agricultural use on larger lots, but it's still zoned and regulated, not a free-for-all.

Dwellings and RVs: The code allows only one principal dwelling per parcel (with a cottage-development exception), and living full-time in an RV isn't permitted outside designated camping/RV areas. Even the county's own RV storage lots explicitly ban overnight occupancy. I found nothing confirming a tiny-home carve-out at the county level, so assume the state Construction Industries Division baseline applies unless you confirm otherwise with the county.

Building permits: The Building Safety Division reviews plans against several adopted codes and specifically tells applicants to call and confirm which codes apply to their project, since not everything gets adopted locally. I found no county exemption for owner-built, straw-bale, or earthen construction, so I'd assume the standard code applies until you hear otherwise.

Septic, greywater, rainwater, wells: These are the fuzziest areas. I couldn't find a county-specific septic ordinance or health department septic program page, likely because so much of the county is on the municipal sewer system. The state's Onsite Wastewater Bureau (NM Environment Department) is the fallback authority for any septic system. Same story for greywater and rainwater harvesting, no county-specific rule turned up, so the state baseline rules would apply. Private wells aren't the norm here either since the county utility covers most residential areas; any well would fall under the state Office of the State Engineer's permitting authority.

Utility disconnection: I didn't find an explicit "you must connect to county water/sewer" ordinance, but because occupancy permits are tied to code-compliant dwellings and the Building Safety Division enforces those standards, going fully off-grid on a standard residential lot isn't something the county has laid out a clear path for.

Bottom line: call the county before you commit to land here. This is very much a "confirm locally" situation.