Off-Grid Living in Sierra County, New Mexico

I've been digging into what off-grid living actually looks like in Sierra County, New Mexico, and the short version is: this is one of the more permissive spots I've researched, mostly because the county has never adopted a countywide zoning ordinance. That said, "permissive" doesn't mean "no rules" - a lot of what governs you here comes from the State of New Mexico rather than the county, and the three incorporated towns (Truth or Consequences, Elephant Butte, Williamsburg) run their own show inside city limits.

Zoning and raw land. Sierra County's own 2017 comprehensive plan says flatly that the county has no zoning ordinance, though it does have a 2011 subdivision ordinance and a few narrow-scope ordinances (flood plain, manufactured housing, economic development, illegal waste disposal). So if you're buying unincorporated land outside those three towns, you're not fighting a zoning map or a use table. Inside town limits, though, local zoning applies and can be much stricter.

Dwellings, tiny homes, RVs. I found a reference to a county Manufactured Housing Ordinance from 1997, but couldn't track down its actual text online, so I can't tell you exactly what it says about tiny homes or living in an RV full time. With no zoning code to fall back on, the practical rules probably come down to that ordinance plus state manufactured/modular home standards from the Construction Industries Division (CID). Call the county to confirm before you commit to a dwelling type.

Building permits. New Mexico's CID handles code enforcement and trade permits (electrical, mechanical, plumbing) in rural areas where counties haven't set up their own building department, and that appears to be the case here, though I couldn't fully confirm whether the county's own "Residential Building Packet" changes that picture. Worth a direct call.

Septic and greywater. This one's clean: Sierra County has no local wastewater ordinance (only Bernalillo County does that in NM), so you're under the New Mexico Environment Department's statewide liquid waste rules. Licensed installers or a homeowner who passes NMED's test can put in a conventional system. Small-scale greywater reuse is permitted under the same state framework.

Rainwater harvesting. No county restriction found; state guidance through the Office of the State Engineer (OSE) governs.

Wells and water rights. This is the one to take seriously. Part of Sierra County sits in the Hot Springs Underground Water Basin, an OSE-administered basin, and you need a permit from OSE's district office before drilling. Basin administration can get tight near Truth or Consequences, so don't assume; call OSE first.

Utility disconnection. No zoning ordinance means no zoning-based mandate to hook up to utilities on county land. I found nothing barring off-grid power or water systems, but I also couldn't confirm any subdivision covenant might say otherwise, so check your specific deed.

Bottom line: Sierra County gives you a lot of room to build off-grid, but several key details (manufactured housing ordinance text, building permit authority) need a direct phone call before you buy or build.