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American Water Works Association


AWWA is your trusted source for certification resourcesPass your certification exam with the new exam prep app or book

Download the free app today and get started studying

Study anywhere

Study Anywhere
No internet connection required.

Vetted by experts

Vetted by Experts
Q&As have been reviewed by water industry experts. 

Track your progress

Track Your Progress
Understand where you need to focus with detailed results and cumulative history charts.

Access on any device

Access on Multiple Devices
Study on your phone, tablet, or desktop. Login to any device and see where you left off.

See answers explained

See Answers Explained
Every math question includes a detailed explanation. 

Study by subject or level

Study by Subject or Level
Questions can be sorted by subject matter and both intro and advanced question sets are available.

The app includes 20 free sample questions and additional question sets are only $19 each!

Download on the App Store for iOS devices   Download on Google Play for android devices   Access the app via your desktop browser

Learn More about the app

Get the new exam prep book

Water Operator Certification Exam Prep Book1,400+ all-new practice questions and answers so that you can take your water operator certification exam with confidence! 
  • Vetted and approved by water industry experts
  • Meets the latest ABC Need-to-Know Criteria
  • Arranged by subject matter and topic for easy reference
  • Includes questions for all certification grade levels

Learn More about the book

AWWA WSO certification guides

WSO Certification Guides

Not quite ready for practice questions and answers? AWWA's WSO guides provide more training on principles and practices of water treatment and water distribution to prepare for certification.

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#NoOperatorNoWater

#NoOperatorNoWater

Certified water operators are a crucial part of providing an adequate and safe supply of water. AWWA has publications, online tools and other resources needed to become an operator.

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Water Operator Online Courses also available from AWWA

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