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