| Physical/Chemical Industrial Waste Operator - Class III | Water Professionals International |
| Wastewater Treatment Operator - Class I | Water Professionals International |
| Wastewater Collection Operator Class I | Water Professionals International |
| Wastewater Treatment Operator - Class II | Water Professionals International |
| Water Collection Operator Class IV | Water Professionals International |
| Small Water Systems Operator | Water Professionals International |
| Inspection and Testing of Water-Based Systems III | National Institute for Certification in Engineering Technologies |
| Household Hazardous Waste & CESQG Collection Operations | Solid Waste Association of North America |
| Water Distribution Operator Class I | Water Professionals International |
| Water Distribution Operator Class II | Water Professionals International |
| Wastewater Lab Analyst Class II | Water Professionals International |
| Certified Biosolids Land Appliers Class II | Water Professionals International |
| Zero Waste Principles & Practices | Solid Waste Association of North America |
| Water Lab Analyst Class I | Water Professionals International |
| Wastewater Collection Operator Class II | Water Professionals International |
| Physical/Chemical Industrial Waste Operator - Class I | Water Professionals International |
| Physical/Chemical Industrial Waste Operator - Class II | Water Professionals International |
| Water Treatment Operator - Class III | Water Professionals International |
| Certified Stormwater Manager | American Public Works Association |
| Wastewater Lab Analyst Class I | Water Professionals International |
| Certified Operator Class I | Water Professionals International |
| Water Distribution Operator Class IV | Water Professionals International |
| Plant Maintenance Technologist Certification Class III | Water Professionals International |
| Wastewater Lab Analyst Class IV | Water Professionals International |
| Water Distribution Operator Class III | Water Professionals International |
| Plant Maintenance Technologist Certification Class I | Water Professionals International |
| Managing MSW Collection Systems | Solid Waste Association of North America |
| Certified Water Technologist | Association of Water Technologies |
| Certified Waste Management Professional | National Registry of Environmental Professionals |
| Physical/Chemical Industrial Waste Operator - Class IV | Water Professionals International |
| Wastewater Collection Operator Class III | Water Professionals International |
| Water Treatment Operator - Class II | Water Professionals International |
| Wastewater Treatment Operator - Class III | Water Professionals International |
| Wastewater Treatment Operator - Class IV | Water Professionals International |
| Water Treatment Operator - Class I | Water Professionals International |
| Water Treatment Operator - Class IV | Water Professionals International |
| Certified Water Specialist | Water Quality Association |
| Plant Maintenance Technologist Certification Class II | Water Professionals International |
| Biological Industrial Waste Operator Class II | Water Professionals International |
| Wastewater Lab Analyst Class III | Water Professionals International |
| Certified Operator Class III | Water Professionals International |
| Water Lab Analyst Class IV | Water Professionals International |
| Certified Operator Class IV | Water Professionals International |
| Water Lab Analyst Class II | Water Professionals International |
| Certified Public Works Professional-Management | American Public Works Association |
| Certified Public Works Professional-Supervision | American Public Works Association |
| Water Lab Analyst Class III | Water Professionals International |
| Inspection and Testing of Water-Based Systems I | National Institute for Certification in Engineering Technologies |
| Certified Biosolids Land Appliers Class I | Water Professionals International |
