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Analysis of Oregon's Domestic Well Testing Act data for use in a sentinel surveillance system for private well contaminants

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dc.contributor.advisor Harding, Anna K.
dc.creator Hoppe, Brenda O.
dc.date.accessioned 2012-05-22T16:23:38Z
dc.date.available 2012-05-22T16:23:38Z
dc.date.copyright 2012-05-01
dc.date.issued 2012-05-01
dc.identifier.uri http://hdl.handle.net/1957/29310
dc.description Graduation date: 2012 en_US
dc.description.abstract The Safe Drinking Water Act ensures that public systems provide water that meets health standards. However, no such protection exists for millions of Americans who obtain water from private wells. Concern for safety is warranted as most wells draw from underground aquifers, and studies demonstrate that groundwater is affected by a range of contaminants, most often nitrate. Oregon's Domestic Well Testing Act (DWTA) links well testing to property sales, enabling continuous data collection by the State. This research addresses a need for identifying datasets for characterizing exposure to private well contaminants by evaluating DWTA data for use in a sentinel surveillance system. Validation of DWTA data was accomplished by developing a land use regression (LUR) model based on agricultural nitrogen inputs and soil leachability to predict nitrate concentrations in well water. Geographic information systems (GIS) were used to advance methods for high resolution spatial modeling of fertilizer and manure nitrogen with statewide coverage. Hazard mapping with these datasets suggests that nearly half of recently drilled wells are susceptible to nitrate contamination. Spearman's rank correlation demonstrated a significant correlation between LUR-predicted nitrate levels and levels reported in the DWTA dataset. These results suggest that DWTA data is valid for use in a sentinel surveillance system, such that evidence of nitrate contamination in a single well may indicate an area-wide health hazard. However, a low fraction of variance explained by the LUR model highlighted the need for specific improvements to datasets crucial for understanding nitrate contamination in well water, including the DWTA. en_US
dc.language.iso en_US en_US
dc.relation Oregon Explorer en_US
dc.subject private wells en_US
dc.subject domestic wells en_US
dc.subject nitrate en_US
dc.subject drinking water en_US
dc.subject groundwater contamination en_US
dc.subject public health surveillance en_US
dc.subject.lcsh Well water -- Oregon -- Testing en_US
dc.subject.lcsh Well water -- Quality -- Oregon en_US
dc.subject.lcsh Groundwater -- Pollution -- Oregon en_US
dc.subject.lcsh Nitrates -- Oregon en_US
dc.subject.lcsh Agricultural pollution -- Oregon en_US
dc.subject.lcsh Drinking water -- Oregon -- Testing en_US
dc.subject.lcsh Drinking water -- Quality -- Oregon en_US
dc.subject.lcsh Land use, Rural -- Environmental aspects -- Oregon
dc.title Analysis of Oregon's Domestic Well Testing Act data for use in a sentinel surveillance system for private well contaminants en_US
dc.type Thesis/Dissertation en_US
dc.degree.name Doctor of Philosophy (Ph. D.) in Public Health en_US
dc.degree.level Doctoral en_US
dc.degree.discipline Health and Human Sciences en_US
dc.degree.grantor Oregon State University en_US
dc.contributor.committeemember White, Denis
dc.contributor.committeemember Hope, Bruce K.
dc.contributor.committeemember Carozza, Susan E.
dc.contributor.committeemember Stone, David L.
dc.contributor.committeemember Hamby, David M.
dc.description.peerreview no en_us

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