Well Water in Morrow County, Oregon: The Nitrate Contamination Crisis

The scale of the problem

The Oregon Health Authority has identified more than 600 domestic wells with unsafe nitrate levels within the Lower Umatilla Basin Groundwater Management Area (LUBGWMA), a roughly 562-square-mile region spanning Morrow and neighboring Umatilla counties, home to an estimated 45,000 residents. Some tested wells have shown nitrate concentrations as high as 63 milligrams per liter -- more than six times the federal legal limit of 10 mg/L for drinking water. Nitrate at these levels is a genuine health concern, most seriously linked to methemoglobinemia ('blue baby syndrome') in infants, and is associated with broader long-term health risks in ongoing research. This isn't a localized or isolated problem affecting a handful of properties -- it's a documented, region-wide groundwater contamination event.

What is driving the contamination

The contamination is directly linked to the industrial growth at the Port of Morrow, particularly its data centers and food-processing operations. Large-scale data centers -- including Amazon Web Services facilities -- use tens of millions of gallons of water annually from the local aquifer for equipment cooling. As that water absorbs heat in the cooling process, it also concentrates dissolved nitrate; it's then funneled into the port's wastewater system and, in significant part, applied to nearby agricultural fields as irrigation and fertilizer supplement -- a practice that has been directly connected to elevated nitrate readings in the wells of nearby rural residents. Large agricultural operations in the area, which have historically applied nitrogen-based fertilizers and effluent to fields in the basin, are also named contributors in the underlying litigation.

The Amazon settlement and ongoing litigation

In March 2026, Amazon agreed to pay $20.5 million to settle claims related to the nitrate-contaminated groundwater in northeast Oregon, while denying liability for the underlying contamination. That settlement resolves only Amazon's portion of the broader case -- litigation continues against the Port of Morrow itself, food processor Lamb Weston, and several large agricultural operations named as co-defendants. For a prospective land buyer, this means the underlying contamination source has not been fully resolved through litigation, remediation, or a comprehensive cleanup plan as of this writing -- the settlement addresses one party's financial liability, not the aquifer's water quality.

Oregon's legislative response

Partly in direct response to this crisis, the Oregon Legislature adopted House Bill 4084, establishing a temporary statewide pause on new data-center enterprise-zone tax authorizations -- a policy explicitly connected to the water-use and pollution concerns that surfaced most visibly in the Morrow County case. While HB 4084 doesn't clean up existing contamination, it signals that Oregon lawmakers are treating data-center water use as an unresolved statewide policy problem, not a one-off local dispute, which suggests continued regulatory attention to groundwater use and quality in the LUBGWMA specifically.

What to do before relying on a Morrow County well

1. Get an independent nitrate test on any existing well before closing, regardless of what a seller or general area reputation suggests -- do not rely on age of the well or distance from the Port of Morrow alone as a proxy for safety.
2. Ask the Oregon Health Authority's LUBGWMA program directly whether the specific parcel or nearby wells have prior test results on file, and what the area's current advisory status is.
3. If nitrate levels are elevated, ask about treatment options (reverse osmosis, distillation, or ion exchange systems can reduce nitrate, but require ongoing maintenance and monitoring) and their realistic cost before assuming a contaminated well is simply usable with a filter.
4. For a new well, confirm current well-siting and depth requirements with Oregon Water Resources Department and ask a licensed well driller about typical nitrate findings at various depths in the specific area, since nitrate contamination in groundwater can vary meaningfully with aquifer depth.
5. If a rural water district line is available as an alternative to a private well, weigh that option seriously given the documented scope of this contamination.