Off-Grid Living in Umatilla County, Oregon

Umatilla County, Oregon is one of those places where the rules genuinely are set at the county level, not town by town, unless you're inside city limits (Pendleton, Hermiston, Umatilla) or an Urban Growth Area, where the city takes over planning and building administration. Outside those city boundaries, the county's own Development Code and Comprehensive Plan, run through the Planning Division, govern zoning, dwellings, and septic. I want to be upfront that I'm researching this from official documents, not living it myself, so treat this as a starting map, not a substitute for a call to the county.

Zoning and raw land. The county has zones like RR-2 and RR-4 Rural Residential and FR Forest Residential, plus farm and grazing zones. Building or occupying a dwelling on raw land in an EFU (farm), Grazing, or Forest zone triggers extra review, including specific replacement-dwelling criteria in the Development Code. If you're eyeing resource-zoned land, expect a formal Land Use Decision or Variance application through Planning before you do anything else.

Dwellings, tiny homes, RVs. The county's code recognizes manufactured/mobile homes, RVs, and campgrounds as distinct categories, with allowances varying by zone, but I could not confirm exact tiny-home or RV-as-permanent-residence standards in the official text. I also could not confirm whether Umatilla County has opted into Oregon's SB 1013 program that lets some RVs count as dwellings during construction. Call Planning directly on this one.

Building permits. Oregon's state Building Codes Division, through its Pendleton field office, handles structural, electrical, plumbing, and mechanical permitting for the county. You need a zoning sign-off from county Planning first, then a structural permit application before construction, including for manufactured home placement.

Septic. Umatilla County Public Health administers septic permitting as DEQ's local agent, which is standard for 33 of Oregon's 36 counties. The process starts with a Land Use Compatibility Statement from Planning. Composting toilet rules specifically weren't confirmed, so ask Health directly.

Greywater and rainwater. I found no Umatilla-specific ordinances for either. The presumption is the statewide DEQ greywater tiered permit program applies as a baseline, and rooftop rainwater harvesting is generally exempt from water-rights permitting under state rules. Confirm locally since county-specific pages weren't found.

Wells and water rights. Wells are state-regulated by the Oregon Water Resources Department; no separate county well permitting layer was confirmed. Worth noting: the Lower Umatilla Basin is a designated Groundwater Management Area due to nitrate contamination, which can affect well siting and monitoring in parts of the county.

Utilities. There's no standalone "off-grid" ban that I found, but practically speaking, the permit process (zoning permit, structural permit, septic LUCS) requires you to document an approved water source and waste disposal method before permits are issued.