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| background | Background Concentrations |
| benchmarks | Benchmark Concentrations |
| cities | Cities and Towns |
| counties | County Boundaries |
| dl | Laboratory Detection Limits |
| esrp | Eastern Snake River Plain Boundary |
| facilities | Idaho National Laboratory Facilities |
| gwl | Groundwater Level Measurements |
| idaho | State of Idaho Boundary |
| inl | Idaho National Laboratory Boundary |
| labels | Map Labels |
| lakes | Lakes and Ponds |
| mountains | Mountain Ranges and Buttes |
| parameters | Parameter Information for Analytes |
| projection | Coordinate Reference System |
| roads | Primary and Secondary Roads |
| samples | Water-Quality Data Records |
| sites | Descriptive Site Information |
| streams | Rivers and Streams |
| topo | Land-Surface Topography |