Advanced Practice for California Grade 3-4 Collection System Operators
California's sewer collection system certification is administered by the California Water Environment Association (CWEA) — a separate program from the SWRCB's drinking water and wastewater treatment certifications. Grade 1 has no education or experience prerequisite; it's designed for an operator with roughly a year of field experience. Grade 3 and Grade 4 both require holding the immediately lower grade certification before testing, making them a genuine progression rather than independent exams.
The certification ladder
- Grade 1: open entry — no formal prerequisite.
- Grade 2: builds on Grade 1 field experience (exact experience/education tables are maintained in CWEA's Candidate Handbook).
- Grade 3: requires holding a valid Grade 2 certification first.
- Grade 4: requires holding a valid