This data release serves to provide supporting datasets used by Genmod and GRTD as part of the supplemental material used to generate 30 general models from which water-particle residence time distributions were determined. Descriptions of files found in the “Attached Files” section below (files with the “.7z” extension are 7-Zip files, http://www.7-zip.org/): “General_Groundwater-Model_Construction_System_Version_0point1_Metadata.xml”: Metadata file describing contents of the shapefiles. “Genmod_directory_structure.png”: A screen capture of the directory structure where the components of the General Groundwater-Model Construction System Version 0.1 (Genmod) are organized on a users' computer system. “shapefiles_30_model_domains.7z”: A zip file containing 30 individual shapefiles, one for each model domain. “GWSW_points.7z”: One shapefile of points with water-elevation data for groundwater and surface-water sites from the USGS National Water Information System (NWIS). “Watersheds.7z”: One shapefile that includes all 30 model domain areas. “Wells.7z”: A shapefile of wells sampled as part of the USGS National Water Quality Assessment Program (NAWQA). “Tracer input.7z”: A spreadsheet file with tracer data. To use this spreadsheet, the program TracerLPM available from the USGS software site at https://www.usgs.gov/software/tracerlpm must be installed on the users' system. Installation may require administrator rights. “factor_added_geology.7z”: One shapefile of the Quaternary Atlas where geologic units were mapped to either coarse or fine sediments (report describing this result is in review). Place this file in the 'input_data/Geology' folder.