Four domains; Audits appears only at Grade 4; no Math domain.
For inspectors on the source control and pretreatment side — visiting industrial, commercial and municipal dischargers, sampling, and enforcing local ordinances alongside United States Environmental Protection Agency, State Water Resources Control Board and Regional Water Quality Control Board rules.
Start studying Grade 4| Content area | % of the exam | |
|---|---|---|
| Environmental Knowledge, Regulations and Compliance | 38 | |
| Administration | 25 | |
| Supervision and Safety | 18 | |
| Audits | 19 |
Audits: inspection completion · an original practice item written only from publicly available sources, not a real exam question
Federal pretreatment rules in the Code of Federal Regulations (40 CFR 403.8(f)(2)(v)) require the control authority to inspect and sample each significant industrial user at least once a year. Your program has 120 significant industrial users, none on reduced reporting, and by year end 102 inspections are complete. What is the completion rate, and how many are outstanding?
B. 85%, with 18 outstanding
Completion = 102 ÷ 120 × 100 = 85%, leaving 120 − 102 = 18 users uninspected. The same section lets a user the control authority has placed on reduced reporting be inspected and sampled once every two years instead, which is why the stem rules that out. 102 outstanding counts the completed inspections as the backlog, 118% inverts the ratio (120 ÷ 102), and 15% is the shortfall rate rather than the completion rate.
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Topic coverage follows Environmental Compliance Inspector Candidate Handbook, Version 04.17.24.01 (California Water Environment Association, effective April 2024; exams from 1 July 2024). Practice questions are written only from publicly available sources (that outline and the regulations and references it cites); they are not real exam questions, which are confidential. Check current application requirements, fees and exam dates on the certifying body's own page: official certification page.
Questions, flashcards, and explanations are AI-written from publicly available sources only: the exam content outlines and candidate materials each certifying body publishes without restriction, and the regulations and technical references they cite. No confidential material is used, including actual exam questions, recollections of any exam sat by the author, or any handbook or document released under a confidentiality agreement. Content is then put through repeated review — regulatory values checked against primary sources, every calculation recomputed, and errors corrected — plus spot checks by the author, who holds California water operator certifications and a California civil engineering licence. Those spot checks are sampling, not a professional review: nothing here is stamped, sealed, or offered as engineering advice, and not every item has been individually verified, so mistakes can still slip through.