Candice B. Hopkins Stephen A. Hundt 2018 <p class="p1">Groundwater is an important source of drinking and irrigation water throughout Idaho, and groundwater quality is monitored by various Federal, State, and local agencies. The historical, multi-agency records of groundwater quality include a valuable dataset that has yet to be compiled or analyzed on a statewide level. The purpose of this study is to combine groundwater-quality data from multiple sources into a single database, to summarize this dataset, and to perform bulk analyses to reveal spatial and temporal patterns of water quality throughout Idaho. Data were retrieved from the Water Quality Portal (<span class="s1"><a href="https://www.waterqualitydata.us/" target="blank" data-mce-href="https://www.waterqualitydata.us/">https://www.waterqualitydata.us/</a></span>), the Idaho Department of Environmental Quality, and the Idaho Department of Water Resources. Analyses included counting the number of times a sample location had concentrations above Maximum Contaminant Levels (MCL), performing trends tests, and calculating correlations between water-quality analytes. The water-quality database and the analysis results are available through USGS ScienceBase (<span class="s1"><a href="https://doi.org/10.5066/F72V2FBG" target="blank" data-mce-href="https://doi.org/10.5066/F72V2FBG">https://doi.org/10.5066/F72V2FBG</a></span>).</p> application/pdf 10.3133/ofr20181079 en U.S. Geological Survey Compilation and analysis of multiple groundwater-quality datasets for Idaho reports