Buying Land in Umatilla County, Oregon

From Pendleton ranch country to an irrigated, industrializing basin

Umatilla County spans a wide range of land, from dryland wheat and cattle country around Pendleton, the county seat, to intensively irrigated farmland further west and north around Hermiston and the city of Umatilla, near the Columbia River. The county's Development Code -- most recently amended in 2025 -- maintains a detailed Exclusive Farm Use zone, and it specifically distinguishes land composed predominantly of irrigated Class IV-VII soils as a distinct category affecting what a given EFU parcel can support. That means a buyer can't treat "EFU" as a single, uniform designation here: irrigation access and documented water rights change the practical use and dwelling picture for a specific tract in ways that vary meaningfully from the dryland wheat ground further east.

A real AWS data-center corridor around Hermiston

Umatilla County is part of one of the most significant data-center development corridors in the country. Amazon Web Services has built data-center capacity around Hermiston and the city of Umatilla dating to roughly 2017, in addition to -- and distinct from -- AWS's larger, longer-running campus in Boardman, which sits just across the county line in neighboring Morrow County; the two are frequently discussed together as a single Umatilla/Morrow data-center region. Amazon has entered into a Strategic Investment Program agreement, which provides a long-term (commonly 15-year) partial property-tax exemption for large capital projects, plus multiple Long Term Rural Enterprise Zone agreements with Umatilla County -- both are negotiated abatement tools rather than standard property assessment.

Reporting on the broader Umatilla/Morrow data-center corridor cites roughly 7,400 full-time-equivalent regional jobs and about $9 billion added to Eastern Oregon's GDP -- figures describing the two-county region together, not Umatilla County in isolation, so treat that scale as directional rather than a county-specific balance sheet. For a land buyer, the practical relevance is that industrial and enterprise-zoned land near Hermiston is genuinely in active demand and the surrounding tax base and infrastructure planning reflect that -- confirm the current zoning and any enterprise-zone boundary for a specific parcel directly with the county.

Groundwater and water-rights due diligence in the irrigated basin

Parts of the Umatilla basin's irrigated farmland have, for decades, fallen within a state-recognized groundwater management area addressing nitrate contamination linked to intensive irrigation and agricultural fertilizer and manure application over time -- background context that any buyer relying on a private well in the county's irrigated lowlands, especially around Hermiston, should take seriously enough to test well water and confirm current status directly with Oregon DEQ, since this page did not re-verify the program's current boundaries or standards this pass.

Beyond groundwater quality, water quantity and rights follow Oregon's standard prior-appropriation system: a water right for irrigation, livestock, or industrial use does not travel automatically with a parcel, and the presence of irrigation on a neighboring tract says nothing about whether a specific parcel carries its own valid water right. Confirm water-right status for any parcel where irrigation matters directly with the Oregon Water Resources Department before assuming it.