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Using Multiple Regression to Explore the Association Between Stream Impairment by Mercury and NPL sites at the HUC-12 Extent Across the Conterminous United States

Authors: Karessa Manning*, University of Tennessee, Liem Tran, University of Tennessee, Knoxville
Topics: Environmental Science, Environment, Geographic Information Science and Systems
Keywords: NPL sites, superfund, environment, environmental health, spatial lag, spatial error, mercury
Session Type: Paper
Presentation File: No File Uploaded


The study is an attempt to determine whether National Priority List (NPL) sites which are contaminated with mercury contribute to stream impairment at the Hydrologic Unit Code 12 (HUC-12) extent across the conterminous United States. In the study, we included major natural and anthropogenic factors that contribute to mercury contamination, such as geologic deposits, landfills, gold and silver mining operations, cement production, atmospheric deposition, and NPL sites. First the connection between individual factors and streams impaired by mercury were explored via spatial overlays and statistical tests (e.g., ANOVA, spatial lag/error regressions). Next, we utilized spatial generalized linear regression on the factors found to be statistically significant in early steps, including NPL sites, to determine if NPL sites contribute significantly to the stream length impaired by mercury at the local, regional, and national levels.

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