Off-Grid Laws in Colorado

I've spent a good chunk of time digging through Colorado's statutes, agency regulations, and county pages to piece together what "off-grid" actually means legally here, and the short answer is: there's no single off-grid law in Colorado. What you're allowed to do depends on a patchwork of state agencies handling narrow slices (wells, rainwater, septic minimums, factory-built housing) layered under county and municipal governments who hold the real power over zoning, permitting, and enforcement. I'm not a lawyer, and this is research, not personal experience, so treat every "confirm with the county" note here as a real instruction, not boilerplate.

Zoning and raw land. There's no statewide zoning code in Colorado. Counties get their zoning authority from state enabling statute (the county planning and zoning statutes under Title 30), which lets county planning commissions and boards of county commissioners set land use, density, lot size, and building height/bulk rules, and require building permits as a condition of construction. Whether you can legally camp, park an RV, or build a cabin on raw land comes down entirely to your specific county's (or town's) zoning code. Some counties are permissive about rural land use, others are not, so this is a call-your-county-planning-office question before you buy land.

Dwellings, tiny homes, and RVs. Colorado has no mandatory statewide building code for privately owned housing. The one place the state does step in directly is factory-built housing: the Division of Housing (part of the Department of Local Affairs) reviews plans and inspects factory-built tiny homes, treating them like modular or HUD-code homes rather than RVs or park models. That state-level construction standard doesn't override local zoning, though. A county or town can still set its own minimum square footage, setback, or unit-count rules for tiny homes, and RVs used as full-time residences are almost always governed by local zoning and land-use codes, not by any state RV statute.

Building permits. With no statewide residential code, permitting authority sits with counties (and municipalities), who adopt building codes and can require permits before you erect or alter a structure, under the authority granted by Colorado's county planning and building statutes. There's no state-issued building permit for site-built homes; that's purely a county/town function.

Septic and composting toilets. The Colorado Department of Public Health and Environment (CDPHE) sets minimum statewide standards for on-site wastewater treatment systems, commonly called OWTS or septic systems, through what's known in the state regulatory code as Regulation 43. Those are floor standards, though; actual permitting, siting approval, and inspection happen at the county or local public health department level, and local boards of health can add their own requirements on top. Composting toilets are recognized in that same regulation's definitions as legitimate waterless systems, but you'll still need your county health department's sign-off to install one.

Greywater. CDPHE's Regulation 86 sets the statewide framework for greywater reuse, capping single-family residential systems at a set daily volume and dictating design standards. Historically, though, greywater reuse has only been legal where the local city or county specifically opted in and adopted a local program, after notifying the state Water Quality Control Division. That's expected to change under a 2024 law (HB24-362) that shifts toward a more uniform statewide approach starting in 2026, so if you're planning greywater reuse, confirm current status with both CDPHE and your county health department. Toilet wastewater is always blackwater, subject to separate, stricter rules, not the greywater regulation.

Rainwater harvesting. This one's genuinely permissive by Colorado standards: a 2016 law (HB16-1005) lets residents collect rooftop rainwater in up to two rain barrels with a combined limit, for outdoor use only, on the same property where it's collected. If you're on a qualifying "exempt" well, a separate 2009 law (SB09-080) lets you collect more through a Rooftop Precipitation Collection System Permit issued by the Colorado Division of Water Resources. Worth knowing: rain barrel use doesn't create a water right, and the State Engineer can shut it down if a senior water-rights holder proves it's causing them harm.

Wells and water rights. The Colorado Division of Water Resources, under the State Engineer, issues every groundwater well permit in the state. Most private wells drilled on smaller parcels since the early 1970s are restricted to household (in-house) use only, meaning outdoor irrigation or livestock watering may not be allowed on that same well without additional permitting. Water quality is entirely the owner's responsibility; the state doesn't test or regulate private well water quality.

Utility disconnection. I couldn't find a state statute or agency page that directly addresses living off the electrical or water grid as its own legal category. This appears to be governed indirectly, through county occupancy and building requirements that may or may not mandate utility connections, so this is squarely a "call your county building department" question.