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9400 Plum Drive, Suite 160
Urbandale, IA 50322
Phone +1 (515) 232-3623
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PO
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  • TESTING SERVICES
    • Information for Testing Clients
      • Exam Validation
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    • ABC Testing
    • Standardized Exams
      • Standardized Water Treatment Operator Exams
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      • Standardized Wastewater Treatment Operator Exams
      • Standardized Wastewater Collection Operator Exams
    • Examination Resources
      • Information for Examinees
      • Study Guides
      • Exam References
        • Backflow Prevention Assembly Tester Exam References
        • Biological Industrial Waste Treatment Operator Exam References
        • Biosolids Land Applier Exam References
        • Physical Chemical Industrial Waste Treatment Operator Exam References
        • Plant Maintenance Technologist Exam References
        • Small Wastewater System Operator Exam References
        • Water Treatment Operator Exam References
        • Wastewater Treatment Operator Exam References
        • Wastewater Collection Operator Exam References
        • Water Distribution Operator Exam References
        • Water Laboratory Analyst Exam References
        • Wastewater Laboratory Analyst Exam References
        • Very Small Water System Operator Exam References
      • Need-to-Know Criteria
      • Formula/Conversion Tables
    • FAQ
  • CERTIFICATION
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  • EVENTS
    • WPI’s Annual Conference – Innovation in Certification
      • IiC23 – Innovation in Certification Conference
      • IiC24 – Innovation in Certification Conference
      • IiC25 – Innovation in Certification Conference
  • Login

Contact WPI

9400 Plum Drive, Suite 160
Urbandale, IA 50322
Phone +1 (515) 232-3623
Send an email

MENU

About WPI
Contact WPI
PO
Prepare for your WPI Exam
Make a Payment
Log In
Facebook Twitter Linkedin Youtube Instagram
  • TESTING SERVICES
    • Information for Testing Clients
      • Exam Validation
      • Exam Development Option
      • Exam Delivery & Reporting
        • Computer-Based Testing Demo
      • Standardized Exams
    • ABC Testing
    • Standardized Exams
      • Standardized Water Treatment Operator Exams
      • Standardized Water Distribution Operator Exams
      • Standardized Wastewater Treatment Operator Exams
      • Standardized Wastewater Collection Operator Exams
    • Examination Resources
      • Information for Examinees
      • Study Guides
      • Exam References
        • Backflow Prevention Assembly Tester Exam References
        • Biological Industrial Waste Treatment Operator Exam References
        • Biosolids Land Applier Exam References
        • Physical Chemical Industrial Waste Treatment Operator Exam References
        • Plant Maintenance Technologist Exam References
        • Small Wastewater System Operator Exam References
        • Water Treatment Operator Exam References
        • Wastewater Treatment Operator Exam References
        • Wastewater Collection Operator Exam References
        • Water Distribution Operator Exam References
        • Water Laboratory Analyst Exam References
        • Wastewater Laboratory Analyst Exam References
        • Very Small Water System Operator Exam References
      • Need-to-Know Criteria
      • Formula/Conversion Tables
    • FAQ
  • CERTIFICATION
    • Certification Program
    • Certification Process
      • Certification Through Examination
        • Examination Resources
      • Certification by Reciprocity
    • Professional Operator
    • Operator Certification
    • Certification Renewals
    • Ohio EPA Certification
    • OpCert Program Contacts
    • FAQ
  • MEMBERSHIP
    • Become a Member
      • Benefits of Becoming a Member
      • Associate Membership
      • Certification Program Membership
      • Non-Regulatory Certification Program Membership
    • Make a Payment
    • WPI Members
  • ABOUT US
    • About Us
    • Read Our IMMERSE Blog
    • WPI Awards
      • WPI Awards Nominations
      • Award Recipients
    • WPI Staff
    • Board of Directors
      • Board of Directors Nominations
    • Certification Commission for Environmental Professionals
    • Annual Reports
    • Get Involved
      • Volunteer Testimonial
    • Login
    • Make a Payment
    • WPI Media Kit
  • EVENTS
    • WPI’s Annual Conference – Innovation in Certification
      • IiC23 – Innovation in Certification Conference
      • IiC24 – Innovation in Certification Conference
      • IiC25 – Innovation in Certification Conference
Make A Payment
  • TESTING SERVICES
    • Information for Testing Clients
      • Exam Validation
      • Exam Development Option
      • Exam Delivery & Reporting
        • Computer-Based Testing Demo
      • Standardized Exams
    • ABC Testing
    • Standardized Exams
      • Standardized Water Treatment Operator Exams
      • Standardized Water Distribution Operator Exams
      • Standardized Wastewater Treatment Operator Exams
      • Standardized Wastewater Collection Operator Exams
    • Examination Resources
      • Information for Examinees
      • Study Guides
      • Exam References
        • Backflow Prevention Assembly Tester Exam References
        • Biological Industrial Waste Treatment Operator Exam References
        • Biosolids Land Applier Exam References
        • Physical Chemical Industrial Waste Treatment Operator Exam References
        • Plant Maintenance Technologist Exam References
        • Small Wastewater System Operator Exam References
        • Water Treatment Operator Exam References
        • Wastewater Treatment Operator Exam References
        • Wastewater Collection Operator Exam References
        • Water Distribution Operator Exam References
        • Water Laboratory Analyst Exam References
        • Wastewater Laboratory Analyst Exam References
        • Very Small Water System Operator Exam References
      • Need-to-Know Criteria
      • Formula/Conversion Tables
    • FAQ
  • CERTIFICATION
    • Certification Program
    • Certification Process
      • Certification Through Examination
        • Examination Resources
      • Certification by Reciprocity
    • Professional Operator
    • Operator Certification
    • Certification Renewals
    • Ohio EPA Certification
    • OpCert Program Contacts
    • FAQ
  • MEMBERSHIP
    • Become a Member
      • Benefits of Becoming a Member
      • Associate Membership
      • Certification Program Membership
      • Non-Regulatory Certification Program Membership
    • Make a Payment
    • WPI Members
  • ABOUT US
    • About Us
    • Read Our IMMERSE Blog
    • WPI Awards
      • WPI Awards Nominations
      • Award Recipients
    • WPI Staff
    • Board of Directors
      • Board of Directors Nominations
    • Certification Commission for Environmental Professionals
    • Annual Reports
    • Get Involved
      • Volunteer Testimonial
    • Login
    • Make a Payment
    • WPI Media Kit
  • EVENTS
    • WPI’s Annual Conference – Innovation in Certification
      • IiC23 – Innovation in Certification Conference
      • IiC24 – Innovation in Certification Conference
      • IiC25 – Innovation in Certification Conference
Make A Payment

We Are WPI:

We ensure the expertise of water and wastewater treatment professionals through testing and certification.

Water and wastewater treatment professionals are on the front lines of protecting public health and the environment. Since 1972, Water Professionals International (formerly known as the Association of Boards of Certification) has been the central water industry authority that ensures these women and men are prepared to meet the standards that their communities can trust in through our testing and certification services.

WPI membership spans 49 U.S. states/territories, 12 Canadian provinces/territories, many Canadian First Nations and U.S. tribal entities, as well as many Eastern European, Caribbean, and Middle Eastern countries/territories. WPI has assisted in the certification of more than 500,000 water and wastewater treatment professionals, including those who have earned a WPI Certification or Professional Operator (PO) Certification.

Join us for our Exam Release Webinar!
WPI is proud to announce the launch of new certification exams in the following areas: Water Treatment, Water Distribution, Wastewater Treatment, and Wastewater Collection. We are thrilled to invite you to an exclusive webinar hosted by Water Professionals International (WPI) and PSI, where we will unveil our latest advancement in water industry examinations. The webinar will take place on February 20th, 2025, 10:00am-12:00pm (CST). Click here to register now!
Click Here to Register!

Click here to make sure you don’t miss out on important updates, news, and communications from WPI.

The water resources our communities trust start with WPI Certification for operators you can trust.

WPI Voluntary Certification Process >

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Member Benefits

WPI members enjoy convenience and cost savings. As a member you have access to the WPI online certification database, networking opportunities, testing services (including expertly written and managed exams), discounted registration for our annual conference, insightful publications, and more.

WPI Member Directory

WPI members are part of our communication network and resource center for certifying authorities. WPI represents our membership on certification matters to national and international governmental agencies, organizations, and professional associations.

Volunteer Opportunities

As public servants, our incredible volunteers expand their dedication to service through their generous commitment of time and energy to WPI.  From our Board of Directors, Subject Matter Experts (SMEs), and Conference Committee to our exam development committee, the opportunities are endless to make a difference today!

2024 Was An Exciting Year for Us:
WPI Year in Review

Professional Operator

WPI’s Professional Operator (PO) program is the only internationally recognized certification and professional development program for water and wastewater treatment professionals in the world. Operators with a PO designation demonstrate their mastery of protecting public health, the environment, and accelerate their careers.

Exams

WPI is committed to providing quality testing services that strengthen the certification programs of our members. We offer standardized and customized certification exams in the categories of water treatment, water distribution, wastewater collection, wastewater treatment, biological and physical/chemical industrial waste, backflow prevention assembly testing, water/wastewater laboratory, biosolids land application, and plant maintenance.

Our exams are built by operators for operators and go through a rigorous psychometric process to ensure they are fair, valid, and legally defensible.

© Water Professionals International.

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9400 Plum Drive, Suite 160
Urbandale, IA 50322
Phone +1 (515) 232-3623
Send an email

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