For operators at advanced treatment facilities — reverse osmosis, advanced oxidation, and the potable reuse plants California is building out. It sits on top of a conventional certificate rather than replacing one: the lowest level, AWT3, requires you to already hold a Grade 3 water or wastewater treatment operator certificate in California or Nevada, so it is not a starting point. The program is run jointly by the California-Nevada section of the American Water Works Association and the California Water Environment Association.
Start studying Advanced Water Treatment| Grade | Eligibility summary |
|---|---|
| AWT Grade 3 | Currently hold a Grade 3 (or higher) water treatment or wastewater treatment operator certificate in California or Nevada. |
| AWT Grade 4 | Pass the AWT3 exam. 2 years of experience with one or more advanced treatment processes. |
| AWT Grade 5 | Pass the AWT4 exam. 3 years of experience: 2 years on one advanced process plus 1 more year covering at least two processes. |
Topic coverage follows Example AWTO Exam Topics (CA-NV American Water Works Association + California Water Environment Association). 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.