Off-Grid Living in Marion County, Oregon

If you're eyeing rural land in Marion County for an off-grid setup, here's what I've found digging through the county's own code and the state rules it leans on.

Zoning comes first. Marion County runs countywide rural zoning under Title 17 of the Marion County Code, administered by the Planning Division. Most rural land you'd consider is likely zoned Acreage Residential (AR) or similar, and that zone exists specifically to make sure any homesite has "adequate water supply and wastewater disposal without exceeding environmental and public service capability." Beyond county zoning, Oregon state law (ORS 446.125) lets you occupy a manufactured dwelling or camping vehicle on private land with the landowner's okay, but only if the parcel can support approved water and sewage disposal. So raw-land occupancy is never a zoning-only question here, it's tangled up with septic and water from day one.

Dwellings and tiny homes get scrutinized. The county's zoning code defines "dwelling" narrowly, excluding mobile homes, travel trailers, and campers. If you want an accessory dwelling unit, Marion County has its own ADU standards: no short-term rentals under 45 days, no splitting the ADU lot off from the main house, and compliance with Oregon's wildfire mitigation building code plus local fire district access rules. Whether an RV-built tiny home counts as a "dwelling" for these purposes isn't something I could confirm from an official county source, only a commercial one, so I'd call Planning directly before assuming your build type qualifies.

Building permits flow through the state code, county-enforced. Marion County's Building Inspection Division enforces the Oregon Structural Specialty Code (a state-adopted code, not a county invention). Here's the catch that trips people up: the county won't issue a building or site permit until your sewage disposal plan is approved, and you can't occupy anything with plumbing until it's hooked to an approved sewage system.

Septic runs through a DEQ-county partnership. Marion County's Building Inspection Division actually administers Oregon DEQ's Onsite Sewage Disposal program locally, so your septic permit application goes to the county, but the rules are the state's. It's the standard two-step process: a site evaluation with test pits, then a construction permit once that's approved.

Greywater and rainwater don't have county-specific rules that I could find. Both default to whatever Oregon DEQ allows statewide, so if you're planning either, get details from DEQ rather than assuming the county has weighed in.

Wells are entirely an Oregon Water Resources Department matter, no separate Marion County well program exists. The county's Comprehensive Plan just encourages cooperation with OWRD and DEQ on groundwater protection.

Bottom line on utility disconnection: the county doesn't ban off-grid living, but it gates occupancy behind approved water and septic, same as the state does everywhere.