| Acronym | Meaning |
 | PWS | Public Water System |
| RQTOX | Reportable Quantities For Chronically Toxic Hazardous Substances |
| TPW | Transformed Plane Wave Method |
| RSAC | Remote Sensing Applications Center (US Forest Service) |
| PIRU | Public Information Reference Unit |
| ACA | American Crystallographic Association |
| CESR | Conduction Electron Spin Resonance |
| POHC | Principal Organic Hazardous Constituents |
| HECD | Hall Electrolytic Conductivity Detector |
| TFA | Trifluoroacetic Acid |
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