Certifications for Water and Wastewater Treatment Plant and System Operators
49 certifications are listed for Water and Wastewater Treatment Plant and System Operators (O*NET 51-8031.00) in the U.S. Department of Labor's CareerOneStop Certification Finder. 47 are tied directly to this occupation; the other 2 are related.
The order is CareerOneStop's, not ours: in demand first, then NCCA- and ANAB-accredited, then the rest. Downloaded July 2026. Records marked confidential or withdrawn at source are not published here. Listing is not endorsement, and this page is not advice about which credential to pursue.
- Certified Water Technologist(CWT)Military occupational specialty
- Inspection and Testing of Water-Based Systems IMilitary occupational specialty
- Biological Industrial Waste Operator Class II
- Certified Biosolids Land Appliers Class I(BLA)
- Certified Biosolids Land Appliers Class II
- Certified Operator Class I
- Certified Operator Class III
- Certified Operator Class IV
- Certified Public Works Professional-Management(CPWP-M)
- Certified Public Works Professional-Supervision(CPWP-S)
- Certified Stormwater Manager(CSM)
- Household Hazardous Waste & CESQG Collection Operations
- Inspection and Testing of Water-Based Systems III
- Managing MSW Collection Systems
- Physical/Chemical Industrial Waste Operator - Class I
- Physical/Chemical Industrial Waste Operator - Class II
- Physical/Chemical Industrial Waste Operator - Class III
- Physical/Chemical Industrial Waste Operator - Class IV
- Plant Maintenance Technologist Certification Class I
- Plant Maintenance Technologist Certification Class II
- Plant Maintenance Technologist Certification Class III
- Small Water Systems Operator
- Wastewater Collection Operator Class I
- Wastewater Collection Operator Class II
- Wastewater Collection Operator Class III
- Wastewater Lab Analyst Class I
- Wastewater Lab Analyst Class II
- Wastewater Lab Analyst Class III
- Wastewater Lab Analyst Class IV
- Wastewater Treatment Operator - Class I
- Wastewater Treatment Operator - Class II
- Wastewater Treatment Operator - Class III
- Wastewater Treatment Operator - Class IV
- Water Collection Operator Class IV
- Water Distribution Operator Class I
- Water Distribution Operator Class II
- Water Distribution Operator Class III
- Water Distribution Operator Class IV
- Water Lab Analyst Class I
- Water Lab Analyst Class II
- Water Lab Analyst Class III
- Water Lab Analyst Class IV
- Water Treatment Operator - Class I
- Water Treatment Operator - Class II
- Water Treatment Operator - Class III
- Water Treatment Operator - Class IV
- Zero Waste Principles & Practices
- Certified Waste Management Professional(CWMP)
- Certified Water Specialist(CWS)
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Certification data from CareerOneStop, sponsored by the U.S. Department of Labor, Employment and Training Administration (DOLETA) and the Minnesota Department of Employment & Economic Development (DEED).
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