Free operator study resources
The free study material that actually exists for the operator exam: the published criteria, the national references worth knowing, and what your state posts.
You do not need to buy a course to pass the operator exam. Free study material exists and it works. Start with the Need-to-Know Criteria from Water Professionals International, the exact list each standardized exam tests. Add national resources: AWWA's Water System Operations series, Sacramento State's Office of Water Programs courses, WEF's wastewater references, and the Montana Water Center's Operator Basics series. New Mexico and Kentucky give away full manuals anyone can use. Your state's page has the closest fit, often with practice exams and math videos by credential.
You can find the Need-to-Know Criteria for your exam track and grade before you start studying. You can name the free national references worth using, from AWWA to the Montana Water Center. You can locate your state's own free study guides, practice exams, and math videos. You can pair these free resources with the guide's other tools for structure and practice.
The free study material that actually exists
You do not have to buy a course to pass. A lot of solid, free study material is published by states, by the exam body, and by a few training programs that give it away. This page points you to the ones worth your time. The material specific to your state is linked from your state page; this is the national set that works no matter where you sit.
Start with the criteria your exam is built on
Water Professionals International publishes the Need-to-Know Criteria, the list of exactly what each standardized exam tests, for free on its site. It is the most honest study guide there is, because the exam is written to it. Pull the one for your track and grade and let it tell you what to study.
National resources worth knowing
- The American Water Works Association keeps a resources hub and the Water System Operations series that many states list as approved references.
- Sacramento State's Office of Water Programs runs the long-standing operator training courses, the ones a lot of operators came up on.
- The Water Environment Federation publishes the wastewater operator references and study guides.
- The Montana Water Center's Operator Basics training series is a free download and a genuinely good starting point for the fundamentals.
- A few states give away full manuals that work anywhere. New Mexico's water systems operator study manual and Kentucky's wastewater operator certification manual are both free and widely used outside their home states.
What your state page links
Most state agencies post their own free study material, and it is the closest fit to your exam because the state wrote or chose it. On your state's page you will find, where the state offers it, the study guides by operator type and class, practice examinations with answer keys, math instructional videos, and the training calendar. Some states post full practice exams with worked answer keys; others post study guides and math videos by credential. Open your state's page and look for the certification section.
Then use this guide
The free resources above teach the same competencies this study center does. When you want the structure, what's on the operator exam lays out the nine domains, the operator math resource fixes the calculations, and the free practice tool gives you the reps. Study from whichever explains it best for you. The exam does not care where you learned it.
Free practice tool
120 worked problems across the exam math. No signup, no email wall.
Water math calculator
The everyday conversions and dosage math, in your pocket.