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C2EP’s PO Wastewater Treatment certification examinations are administered in computer-based format by Applied Measurement Professionals (AMP) at more than 190 AMP Assessment Centers geographically located throughout the USA.

Once an applicant has been approved to complete the examination, he or she will be contacted by AMP with information to schedule the examination. The examination must be completed within a 180-day eligibility period beginning at AMP’s notification. Candidates may attempt the examination as often as every 30 days during this eligibility period.

Candidates can watch this video to learn about what to expect on their test day. The video provides a general overview of the testing process, but for specific information, please review the details below. 


PO certification examinations are administered by appointment only, Monday through Saturday at 9 a.m. Central time and 1:30 p.m. Central time. The AMP scheduling notice will contain a toll-free telephone number and website address for the candidate to schedule an examination appointment as soon as two business days later. AMP will collect the examination sitting fee of $69 during the scheduling process.


Once you have been approved to take the examination, you may schedule an examination appointment online at any time at To use this service on AMP’s website, follow these easy steps:

1.      Go to and select “Schedule/Apply for an Exam.”

2.      Follow the simple, step-by-step instructions to choose your examination program and register for the examination. Please have your credit card available for online payment of examination fees.


Call AMP at 800-345-6559 to schedule an examination appointment. This toll free number is answered from 7 a.m. to 9 p.m. (Central time) Monday through Thursday, 7 a.m. to 7 p.m. Friday, and 8:30 a.m. to 5 p.m. Saturday. Please have your credit card available for payment of examination fees.


You may reschedule your examination once at no charge online at or by calling AMP at 800-345-6559 at least two business days prior to your scheduled examination appointment. The following schedule applies: 


If your examination is scheduled on…

You must contact AMP by

3 p.m. Central time the prior…












You will forfeit the examination registration and all fees paid under the following circumstances:

·        You wish to reschedule an examination but fail to contact AMP at least two business days prior to the scheduled testing session.

·        You wish to reschedule a second time.

·        You appear more than 15 minutes late for an examination.

·        You fail to report for an examination appointment.


In the event of inclement weather or unforeseen emergencies on the day of an examination, AMP will determine whether circumstances warrant the cancellation, and subsequent rescheduling, of an examination. The examination will usually not be rescheduled if the Assessment Center personnel are able to open the Assessment Center.

You may visit AMP’s website at prior to the examination to determine if AMP has been advised that any Assessment Centers are closed. Every attempt is made to administer the examination as scheduled; however, should an examination be canceled at an Assessment Center, all scheduled candidates will receive notification following the examination regarding rescheduling their examinations.

If power to an Assessment Center is temporarily interrupted during an administration, your examination will be restarted. The responses provided up to the point of interruption will be intact, but for security reasons the questions will be scrambled.


AMP complies with the Americans with Disabilities Act and strives to ensure that no individual with a disability as defined by the ADA as a person who has a physical or mental impairment that substantially limits one or more major life activities, a person who has a history or record of such an impairment, or a person who is perceived by others as having such an impairment is deprived of the opportunity to take the examination solely by reason of that disability. AMP will provide reasonable accommodations for candidates with disabilities. Candidates requesting special accommodations must call AMP at 800-345-6559 to schedule their examination.

Please note:

·        Wheelchair access is available at all established Assessment Centers. Candidates must advise AMP at the time of scheduling that wheelchair access is necessary.

·        Candidates with visual, sensory, physical, or learning disabilities that would prevent them from taking the examination under standard conditions may request special accommodations and arrangements.

alertIconVerification of the disability and a statement of the specific type of assistance needed MUST BE MADE IN WRITING TO AMP at least 45 calendar days prior to your desired examination date by completing the Request for Special Examination Accommodations form. AMP will review the submitted forms and will contact you regarding the decision for accommodations.


AMP administration and security standards are designed to ensure all candidates are provided the same opportunity to demonstrate their abilities. The Assessment Center is continuously monitored by audio and video surveillance equipment for security purposes.

The following security procedures apply during the examination:

·        Examinations are proprietary. No cameras, notes, tape recorders, Personal Digital Assistants (PDAs), pagers, or cellular/smartphones are allowed in the testing room. Possession of a cellular/smartphone or other electronic devices is strictly prohibited and will result in dismissal from the examination.

·        Only silent, non-programmable calculators without alpha keys or printing capabilities are allowed in the testing room.

·        No guests, visitors, or family members are allowed in the testing room or reception areas.


To gain admission to the assessment center, you must present two forms of identification. Failure to provide appropriate identification at the time of the examination is considered a missed appointment. There will be no refund of your testing fee.

The primary form must be government issued, current, and include your name, signature, and photograph. No form of temporary identification will be accepted. You will also be required to sign a roster for verification of identity.

Examples of valid primary forms of identification are current:

·        Driver's license with photograph;

·        State identification card with photograph;

·        Passport; and

·        Military identification card with photograph.

The secondary form of identification must display your name and signature for signature verification. Examples include: 

·        Credit card with signature;

·        Social Security card with signature; and

·        Employment/student ID card with signature.

If your name on your registration is different than it appears on your identification, you must bring proof of your name change (e.g., marriage license, divorce decree, or court order).

You must have proper identification to gain admission to the Assessment Center. Failure to provide appropriate identification at the time of the examination is considered a missed appointment. There will be no refund of your testing fee.


No personal items, valuables, or weapons should be brought to the Assessment Center. Only wallets and keys are permitted. Coats must be left outside the testing room. You will be provided a soft locker to store your wallet and/or keys with you in the testing room. You will not have access to these items until after the examination is completed. Please note the following items will not be allowed in the testing room except securely locked in the soft locker:

·        Watches          

·        Hats

·        Wallets

·        Keys

Once the examinee has placed his or her personal belongings into the soft locker, he or she will be asked to pull out his or her pockets to ensure they are empty. If all personal items will not fit in the soft locker, the examinee will not be able to test. The site will not store or be responsible for examinees’ personal belongings.

If any personal items are observed or heard (e.g., cellular/smartphones, alarms) in the testing room after the examination is started, the administration will be forfeited.


All PO certification exams are closed book. No reference material, programmable calculators, computers, or cameras are allowed in the examination site. Candidates should only bring photo identification, a non-programmable calculator, two sharpened soft-lead (#2 or HB) pencils, and an eraser to their exam sites; any other material must be left outside. Also, candidates are not allowed to take any written material from the examination site.

PO Wastewater Treatment candidates will be provided with the ABC & C2EP Formula/Conversion Table for Wastewater Treatment, Industrial, Collection, & Laboratory Exams  and one piece of scratch paper at a time to use during the examination. Candidates must return the scratch paper and Formula/Conversion Table to the supervisor at the completion of testing, or they will not receive their score report.

Please note:

·        Pencils will be provided during check-in.

·        Candidates will be provided with one piece of scratch paper at a time to use during the examination, unless noted on the sign-in roster for a particular candidate. Candidates must return the scratch paper to the proctor at the completion of testing, or they will not receive their score reports.

·        No documents or notes of any kind may be removed from the Assessment Center.

·        No questions concerning the content of the examination may be asked during the examination.

·        Eating, drinking, or smoking is not permitted in the Assessment Center.

·        Candidates may take a break whenever they wish, but will not be allowed additional time to make up for time lost during breaks.


If an examinee engages in any of the following conduct during the examination he or she may be dismissed, and his or her scores will not be reported and examination fees will not be refunded. Examples of misconduct include:

·        Creating a disturbance, are abusive, or otherwise uncooperative;

·        Displaying and/or using electronic communications equipment such as pagers, cellular/smartphones, PDAs;

·        Talking or participating in conversation with other examination candidates;

·        Giving or receiving help or being suspected of doing so;

·        Leaving the Assessment Center during the administration;

·        Attempting to record examination questions or make notes;

·        Attempting to take the examination for someone else; and

·        Being observed with personal belongings, notes, books, or other aids without it being noted on the roster.


After your identification has been confirmed, you will be directed to a testing carrel. You will be instructed on-screen to enter your identification number. You will take your photograph which will remain on-screen throughout your examination session. This photograph will also print on your score report.


Prior to attempting the examination, you will be given the opportunity to practice taking an examination on the computer. The time you use for this practice examination is NOT counted as part of your examination time or score.

When you are comfortable with the computer testing process, you may quit the practice session and begin the timed examination.

If you wish to see and practice navigating within the computer-based testing environment before your examination date, complete the Sample Wastewater Treatment Operator Exam Questions.


Report to the Assessment Center no later than your scheduled appointment time. Look for signs indicating AMP Assessment Center Check-in. If you arrive more than 15 minutes after the scheduled testing time you will not be admitted. You may bring a non-programmable calculator to the examination. Calculators with printing capabilities, full alpha keypads, or built into cellular/smartphones or hand-held computers (PDAs) are not permitted in the Assessment Center.

Computer-based tests are completed through an LXR•Test Interface. Candidates record their response by typing a keystroke or clicking a mouse, and have the capability of paging through the test one item at a time. The screenshot below provides a summary of the functions of the LXR•Test software available to candidates during computer-based testing.


Before beginning the examination, instructions for taking the examination are provided on-screen. There is a three-hour time limit for PO certification examinations. The computer monitors the time you spend on the examination. The examination will terminate if you exceed the time allowed. You may click on the “Time” box in the lower menu bar on the screen to monitor your time. A digital clock indicates the time remaining for you to complete the examination. The Time feature may be turned off during the examination.

Only one examination question is presented at a time. The question number appears in the lower right portion of the screen. Choices of answers to the examination question are identified as A, B, C, or D. You must indicate your choice by either typing in the letter in the response box in the lower left portion of the computer screen or clicking on the option using the mouse. To change your answer, enter a different option by typing in the letter in the response box or by clicking on the option using the mouse. You may change your answer as many times as you wish during the examination time limit.

To move to the next question, click on the forward arrow (>) in the lower right portion of the screen. This action will move you forward through the examination question by question. If you wish to review any question or questions, click the backward arrow (<) or use the left arrow key to move backward through the examination.

An examination question may be left unanswered for return later in the examination session. Questions may also be bookmarked for later review by clicking in the blank square to the right of the Time button. Click on the hand icon to advance to the next unanswered or bookmarked question on the examination. To identify all unanswered and bookmarked questions, repeatedly click on the hand icon. When the examination is completed, the number of examination questions answered is reported. If not all questions have been answered and there is time remaining, return to the examination and answer those questions.


During the examination, comments may be submitted for any question by clicking on the button displaying an exclamation point (!) to the left of the Time button. This opens a dialogue box where comments may be entered. Comments will be reviewed, but individual responses will not be provided and scores will not be adjusted.


After completing the examination, examinees are asked to complete a short evaluation of their examination experience. Then, examinees are instructed to report to the examination proctor to receive an examination completion report. AMP will also provide the examination results to C2EP. To learn more about examination results and scoring, visit PO Wastewater Treatment Examination Results.


Candidates must wait 30 days between attempts of the examination. Examination eligibility expires 180-days after the date of the initial scheduling notice from AMP. Candidates who do not pass the certification examination during the 180-day eligibility period must reapply to C2EP as a new applicant.

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