| 926 14 | AIR POLLUTION CONTROL SERVICES, INCLUDING DATA COLLECTION RESEARCH AND DEVELOPMENT, ETC. |
| 926 15 | AIR QUALITY MONITORING SERVICES |
| 926 23 | AUDITING SERVICES, ENVIRONMENTAL |
| 926 25 | CARBON OFFSETS |
| 926 29 | CONTAMINATED GROUNDWATER SERVICES, INCLUDING DISCHARGE PIPE INSTALLATION |
| 926 30 | CONTAMINATED SOIL SERVICES |
| 926 40 | ECOLOGICAL SERVICES |
| 926 41 | ECOSYSTEMS DEVELOPMENT, MANAGEMENT AND PROTECTION SERVICES |
| 926 42 | ENVIRONMENTAL SERVICES (NOT OTHERWISE CLASSIFIED) |
| 926 43 | GAS ANALYSIS SERVICES |
| 926 45 | HAZARDOUS MATERIAL AND WASTE SERVICES, INCLUDING EMERGENCY RESPONSE AND NUCLEAR WASTES |
| 926 49 | HYDRAULIC PUSH PROBE, GEOPROBE SERVICES |
| 926 52 | IMPACT STUDIES, ENVIRONMENTAL |
| 926 53 | INDUSTRIAL HYGIENE TESTING SERVICES |
| 926 54 | INVESTIGATION SERVICES, POLLUTION |
| 926 58 | LEAD AND ASBESTOS INSPECTION SERVICES |
| 926 62 | NOISE TESTING SERVICES |
| 926 65 | OIL AND PETROLEUM SPILL SERVICES, INCLUDING REMOVAL OF USED PETROLEUM PRODUCTS |
| 926 66 | OIL AND WATER SEPARATOR INSPECTION AND TESTING SERVICES |
| 926 70 | PERMITTING SERVICES, ENVIRONMENTAL |
| 926 72 | PLANNING AND ADVISORY SERVICES, ENVIRONMENTAL |
| 926 75 | RADIATION DOSIMETER SERVICES |
| 926 76 | RADIOACTIVE WASTE DISPOSAL SERVICES |
| 926 77 | RECYCLING SERVICES |
| 926 78 | REMEDIATION SERVICES, ENVIRONMENTAL, INCLUDING REHABILITATION SERVICES HAZARDOUS WASTE AND MOLD REMEDIATION |
| 926 79 | RECOVERY, RECYCLING, AND RECLAMATION OF REFRIGERANTS |
| 926 81 | SANITIZING AND DISINFECTING SERVICES |
| 926 82 | SAFETY SERVICES, ENVIRONMENTAL |
| 926 83 | SITE ASSESSMENT, ENVIRONMENTAL |
| 926 84 | SOIL POLLUTION SERVICES |
| 926 85 | SOIL, SOIL VAPOR AND GROUNDWATER SAMPLING AND ANALYSIS, INCLUDING DISPOSAL |
| 926 88 | STORM WATER DISCHARGE TESTING SERVICES |
| 926 90 | SUBSURFACE TESTING, ENVIRONMENTAL |
| 926 91 | TANK TESTING AND DISPOSAL SERVICES, STORAGE, INCLUDING UNDERGROUND TYPES |
| 926 93 | TESTING AND MONITORING SERVICES, AIR, GAS, AND WATER |
| 926 94 | WATER POLLUTION SERVICES |
| 926 95 | WATER AND WASTEWATER CONSERVATION SERVICES |
| 926 96 | WETLAND DELINEATIONS, INCLUDING ASSESSMENTS |