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  • Protecting Public Health and the Environment

Wastewater Operator Certification

New York State certification grades are divided into four levels, 1, 2, 3 & 4 with 1 being the lowest and 4 the highest grade.  All activated sludge certifications will be designated with the letter "A" (1A, 2A, 3A and 4A).  

Every operator in New York State who wishes to be certified at any level (Grade 1, 1A, 2, 2A, 3, 3A, 4 or 4A) must satisfy the minimum qualifications.  The qualifications consist of education, experience at a wastewater treatment facility, pre-certification training through DEC-approved courses, and passage of an Association of Boards of Certification (ABC) exam.  
Exam Qualifications and Application Instructions by Grade Level
Click on the Grade exam for which you wish to apply:  
​​All application packages must be mailed to NYWEA via the US Postal Service or an express delivery service.  Emailed or faxed application packages are not accepted.  

Exam Application Documents

Pre-Certificat​ion Training

Exam Application Fee 

NYWEA announces a necessary change in the Operator Certification Application Fee effective Sept. 1, 2023.  Since the transition of the program from NYS DEC to NYWEA in 2011, this fee has not changed.  The exam application fee, formerly $150, is now $195.  This change was effective Sept. 1, 2023.   
Payment method options:
  • Check (payable to NYWEA) 
  • Money Order (payable to NYWEA)
  • Voucher/Purchase Order Number
  • Pay online with Paypal, Visa or Mastercard:  Click HERE to access the online payment portal You will automatically receive a receipt following the transaction; NYWEA will be notified that the fee has been paid.  NYWEA will match up this fee payment notice with your application packet once it is received in the NYWEA office via the postal mail or express delivery service.  
NYWEA's exam application fee is separate from the $112 exam fee that is paid to PSI, the test administrator that adminsters the ABC exams.  Operators who retake an exam do not need to reapply to NYWEA; they are responsible only for the $112 PSI exam fee.

Exam Scheduling Instructions for Approved Candidates

PSI, the test administator, upgraded its online scheduling platform on December 15, 2023.
  • ​The new website address is:
  • ​If you created an online account on PSI's former platform, you must create a new account to schedule a future test or reschedule a current one.
  • First-time users must also create an account.
  • Click HERE for directions​ to schedule your appointment online.  
Exam Resources​​

​​​ABC has recently under a rebranding and is now called Water Professionals International​​ (WPI); however, the exams will continue to be called ABC exams.


The certification grades are divided into four (4) levels, 1, 2, 3 & 4. Based on the facilities SPDES Discharge Permit, this will determine what classification you can test for.

Application Fees


Exam Results
​These are the exam results from ABC (WP​I) exams in New York State for the following period:
​​​Exam Results thru Nov 23.png​​​​