Washington Administrative Code
Title 173 - Ecology, Department of (See also Titles 197, 317, 372, and 508)
Chapter 173-230 - Certification of operators of wastewater treatment plants
Section 173-230-250 - Education and experience requirements for Groups I through IV certifications
Current through Register Vol. 24-06, March 15, 2024
(1) Applicants must meet the following education and experience requirements.
(2) Groups I through IV education, operating experience requirements, and allowable substitutions include the following:
Table 2 Operator Certification Requirements and Substitutions
Operator Certification Requirements and Substitutions |
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Certification level |
Required education |
Substitutions allowed for education |
Required operating experience |
Education substitutions allowed for operating experience |
Relevant experience substitutions allowed for operating experience |
Group I |
High school diploma or GED |
One year of relevant experience for each year of education through twelfth grade |
1 year |
None |
None |
Group II |
High school diploma or GED |
One year of relevant experience for each year of education through twelfth grade |
3 years |
Up to 67.5 relevant credits/CEUs |
Up to 1 year and 6 months of relevant experience |
Group III |
High school diploma or GED and 2 years of college (90 credits or CEUs) |
Up to 4 years of excess operating experience: *1 year of excess operating experience for the first 45 credits/CEUs *3 years of excess operating experience for the last 45 credits/CEUs |
4 years, with at least 2 years at a Class II or higher plant |
Up to 90 relevant credits/CEUs |
Up to 2 years of relevant experience |
Group IV |
High school diploma or GED and 4 years of college (180 credits or CEUs) |
Up to 8 years of excess operating experience: *1 year of excess operating experience for each 45 credits/CEUs for the first 90 credits/CEUs *3 years of excess operating experience for each 45 credits for the second 90 credits/CEUs |
4 years, with at least 2 years at a Class III or higher plant |
Up to 90 relevant credits/CEUs |
Up to 2 years of relevant experience |