Oregon Gov. Tina Kotek calls on groundwater pollution committee to add Spanish-speaking member (OPB, 5/9/23)
Lower Umatilla Basin groundwater management area action plan (2020) Oregon Department of Environmental Quality
Analysis of groundwater nitrate concentrations in the Lower Umatilla Basin groundwater management area (2012) Oregon Department of Environmental Quality
Independent review of the Lower Umatilla Basin (LUB) groundwater management area (GWMA) monitoring program (2013) Oregon Department of Agriculture