| SIC Major Group and Description | Environmental Management Systems and Compliance Support | Regulatory Analysis | Air Quality Permitting and Emissions Inventories | Air Dispersion Modeling | Waste/ Wastewater Management | |
| 12 | Bituminous Coal and Lignite Mining |  |
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| 13 | Oil and Gas Extraction | |
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| 27 | Printing and Publishing | |
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| 28 | Chemicals | |
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| 29 | Petroleum Refining | |
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| 30 | Rubber and Plastics | |
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| 32 | Stone, Clay, Glass, and Concrete | |
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| 33 | Primary Metals | |
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| 34 | Fabricated Metals | |
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| 35 | Industrial and Commercial Machinery | |
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| 36 | Electronics | |
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| 37 | Transportation Equipment | |
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| 42 | Petroleum/Chemical Terminals for Hire | |
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| 46 | Pipelines, Except Natural Gas | |
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| 49 | Electric, Gas, and Sanitary | |
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| 51 | Petroleum Bulk Stations/Terminals | |
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| 76 | Tank Truck Cleaning | |
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