Division of Environmental and Community Health

Maine Center for Disease Control & Prevention

A Division of the Maine Department of Health and Human Services

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Water Operator Exams

Water Operator Exams

Page Index

Computer-Based Exams

Instructions for Online Sign-Up

Next Steps

Water Operator licensure examinations are standardized exams produced by the Association of Boards of Certification (ABC). These nationally-based multiple-choice exams are validated and reviewed. The Board welcomes operators to become subject matter experts and participate in the exam development process.

Exams may be taken in the traditional paper-based process or by computer. Exams do not need to be taken following sequential order (i.e., passing lower levels and working one's way up); instead, they can be taken at the licensure level one wishes.


Computer-Based Exams

Important Notices Regarding New PSI exam/registration:

PSI Online: To register online go to Those with exams already scheduled are all set, but all others must create a new account at the new site in order to register for exams. PSI offers Water Operator exams for Maine licensure in Bangor, Farmington, Portland, Presque Isle, and South Portland. Refer to this handbook for any questions.

Exam Prices:

  • VSWS: $83.00
  • Class I- IV, Treatment and Distribution: $104.00

For general licensing questions, contact David Welch:  Email, or phone (207) 287-3056

Sign Up Online for a Computer-based Exam

Step-by-Step Instructions:

  • Once on the website, click Sign In / Create Account on the top right.
  • Sign in or create a new account. If you've never used the new in December 2023 exam site, you will need to create a new account.
  • Once you're logged into your new account, click Schedule, New Booking.
  • Select the exam you want to take. Exams are listed alphabetically.
  • Lots of great information appears on the selected exam's landing page. Take the time to read through it, then click Continue Booking.
  • Click Continue Booking on the Test Format page as well.
  • On the next screen, complete the Candidate Details and consider reading the information in the Candidate Bulletin. It contains information about:
    • PSI's nondiscrimination policy
    • Special arrangements for candidates with disabilities
    • payments
    • online scheduling
    • contacting PSI by phone
    • examination rescheduling
    • missed appointments
    • inclement weather
    • indentification need at the test site
    • security at the test site
    • personal belonging at the test site
    • examination restrictions
    • misconduct, and much more
  • Click Continue Booking, and Find Your Nearest Test Center on the following page. Maine has sites in Bangor, Farmington, Portland, Presque Isle, and South Portland. However, you can take tests anywhere in the country, including New Hampshire for those living in the southernmost parts of Maine.
  • When you know which location at which you'd like to take the exam, click Vew available time slots. Then select the day and time slot you want, so that both are green, then click Book This Time Slot.
  • Complete you billing address, then click Continue.
  • Select a payment method (Credit Card or Paypal), enter your payment information, then click Continue.


Next Steps

Training providers and resources can be found here.

Classes are posted on the Professional Development Calendar.

Once you have passed the exam you may apply for licensure.

Your first license is the initial license. This may be a license in one or both treatment and distribution disciplines. When you take and pass a higher level of exam you may apply for an upgraded license. Click here to open the Application for Licensure (PDF).

Note: Exam results are accepted for one calendar year from the exam date. If you do not apply for your license in that time, the exam will need to be repeated.

Updated 12/5/2023