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| Acronym | Acronym Meaning | Additional Information |
|---|---|---|
| G/T | Generator/Transporter | |
| GAAP | Generally Accepted Accounting Principles | |
| GAC | Granular Activated Carbon | |
| GACT | Granular Activated Carbon Treatment | |
| GAFB | Grissom Air Force Base | |
| GAO | General Accounting Office | |
| GAW | Global Atmosphere Watch | |
| GC/MS | Gas Chromatography/Mass Spectrometry | |
| GC/MS | Gas Chromatograph/Mass Spectrograph | |
| GCC | Global Climate Convention | |
| GCWR | Gross Combination Weight Rating | |
| GDE | Generic Data Exemption | |
| GDP | Gross Domestic Product | |
| GEI | Geographic Enforcement Initiative | |
| GEMI | Global Environmental Management Initiative | |
| GEMS | Global Environmental Monitoring System | GEMS Water  |
| GEMS | Graphical Exposure Modeling System | |
| GEP | Good Engineering Practice | |
| GFAAS | Graphite Furnace Atomic Adsorption Spectrophometer | |
| GFF | Glass Fiber Filter | |
| GFO | Grant Funding Order | |
| GFS | Government-Furnished Property | |
| GHG | Green House Gas | |
| GICS | Grant Information and Control System | |
| GIS | Geographic Information Systems | |
| GIS | Global Indexing System | |
| GLAD | Great Lakes Atmospheric Deposition Network | |
| GLC | Gas Liquid Chromatography | |
| GLERL | Great Lakes Environmental Research Laboratory | |
| GLISP | Great Lakes International Surveillance Plan | |
| GLNPO | Great Lakes National Program Office | |
| GLP | Good Laboratory Practices | |
| GLPN | Great Lakes Precipitation Network | |
| GLPPR | Great Lakes Pollution Prevention Roundtable | |
| GLWQA | Great Lakes Water Quality Agreement | |
| GMCC | Global Monitoring for Climatic Change | |
| GOCO | Government-Owned/ Contractor-Operated | |
| GOGO | Government-Owned/Government-Operated | |
| GOP | General Operating Procedures | |
| GOPO | Government-Owned/ Privately-Operated | |
| GPAD | Gallons-per-acre per-day | |
| GPD | Gallons per Day | |
| GPG | Grams-per-Gallon | |
| GPM | Gallons per Minute | |
| GPR | Ground-Penetrating Radar | |
| GPRA | Governmental Performance and Results Act (IDEM) | |
| GPS | Groundwater Protection Strategy | |
| GPS | Global Positioning System | |
| GR | Grab Radon Sampling | |
| GRAS | Generally Recognized as Safe | |
| GRCDA | Government Refuse Collection and Disposal Association | |
| GRGL | Groundwater Residue Guidance Level | |
| GRR | Ground Water Record Review | |
| GSA | Geological Society of America | |
| GT | Gas Turbine | |
| GTN | Global Trend Network | |
| GTR | Government Transportation Request | |
| GVL | Geology Violation Letter (IDEM) | |
| GVP | Gasoline Vapor Pressure | |
| GVW | Gross Vehicle Weight | |
| GVWR | Gross Vehicle Weight Rating | |
| GW | Ground Water or Groundwater | |
| GW | Grab Working-Level Sampling | |
| GWCC | Ground Water Contaminant Concentration | |
| GWDR | Ground Water Disinfection Rule | |
| GWM | Ground Water Monitoring | |
| GWP | Global Warming Potential | |
| GWPC | Ground Water Protection Council | |
| GWPS | Ground Water Protection Standard | |
| GWPS | Ground Water Protection Strategy | |
| GWQS | Ground Water Quality Standard (Indiana) | |
| GWUDI | Ground Water Under the Direct Influence of Surface Water |
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