RCW 70A.212.030 — Wastewater treatment plant operators—Certification requiredWashington State LegislatureRCW 70A.212.030 · Verified 2026-07-28Washington law requires the designated operator in responsible charge, and qualifying lead shift operators, to hold certification tied to the plant classification.
View official sourceWAC 173-230-200 — DefinitionsWashington State Department of EcologyWAC 173-230-200 · Verified 2026-07-28Defines CEU, full certification, exam cycle, operating experience, professional-growth reporting period, and other controlling terms.
View official sourceCertification informationWashington State Department of EcologyEcology Wastewater Operator Certification — Certification information · Verified 2026-07-28Provides current application, exam administration, operating-experience, OIT, maintenance, reciprocity, study-resource, and contact guidance.
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