{"accessLevel": "public", "bureauCode": ["020:00"], "contactPoint": {"fn": "Jana Compton", "hasEmail": "mailto:compton.jana@epa.gov"}, "description": "Shallow groundwater samples were collected since 2006 for routine analysis by ODEQ from 16 domestic wells (installation dating from the 1970s) and 23 ODEQ groundwater monitoring wells (installation dating between 2003-2006) across the SWV-GWMA. In 2012, sampling and analysis for water isotopes (\u03b4H2O:\uf020\uf0642H-H2O and \uf06418O-H2O) were added to the monitoring program. At that time, ODEQ collected samples quarterly in all wells. However, in 2016, ODEQ decreased sampling frequency to once a year (May/June) for all 39 wells, while 12 wells continued to be sampled every quarter. At the same time, sampling and analysis for NO3- isotopes (\u03b4NO3-: \uf06415N-NO3- and \uf06418O-NO3-) were added to the monitoring program. This study reports on the monitoring results through 2019, which includes 8 years of water isotope and 4 years for nitrate isotope data. Data were added to include data collected through May 2024, adding 4 additional years. \n\nThis dataset is associated with the following publication:\nWeitzman, J., J.R. Brooks, P. Mayer, W. Rugh, and J. Compton. Coupling the dual isotopes of water (\u03b42H and \u03b418O) and nitrate (\u03b415N and \u03b418O): A new framework for classifying current and legacy groundwater pollution.   Environmental Research Letters. IOP Publishing LIMITED, Bristol,  UK, 16(4): 045008, (2021).", "distribution": [{"downloadURL": "https://pasteur.epa.gov/uploads/10.23719/1519089/SWV-GWMA%20Data%20for%20SciHub%20250513.xlsx", "mediaType": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "title": "SWV-GWMA Data for SciHub 250513.xlsx"}], "identifier": "https://doi.org/10.23719/1519089", "keyword": ["community research", "groundwater", "nitrate", "nitrogen", "nutrient managment", "translational science", "water quality", "well water"], "license": "https://pasteur.epa.gov/license/sciencehub-license.html", "modified": "2020-07-22", "programCode": ["020:000"], "publisher": {"name": "U.S. EPA Office of Research and Development (ORD)", "subOrganizationOf": {"name": "U.S. Environmental Protection Agency", "subOrganizationOf": {"name": "U.S. Government"}}}, "references": ["https://doi.org/10.1088/1748-9326/abdcef", "https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8059602"], "rights": null, "title": "Coupling the dual-isotope indicators of water and nitrate indicates legacy groundwater pollution"}