INDUSTRIAL WASTEWATER OPERATOR
PREPARATION TEST 2026 QUESTIONS AND
CORRECT ANSWERS GRADED A+
● Certification Process. Answer: Certification is obtained by meeting
minimum education and experience requirements, submitting the
appropriate forms and fee, and passing the certification examination
with at least a 70%.
● Class I. Answer: Wastewater treatment plant with a design capacity of
≤50,000 GPD.
● Class II. Answer: Wastewater treatment plant with a design capacity of
50,001 GPD to ≤ 2,000,000 GPD.
● Class III. Answer: Wastewater treatment plant with a design capacity
of 2,000,001 to ≤ 7,500,000 GPD.
● Class IV. Answer: Wastewater treatment plant with a design capacity ≥
7,500,001 GPD.
● Education Substitution. Answer: Education in environmental
engineering, environmental technology, and biological, physical, or
, chemical sciences shall be substituted if it does not exceed fifty (50)
percent of the required experience.
● Associate Degree Substitution. Answer: An associate degree may
substitute for two (2) years of experience.
● Baccalaureate Degree Substitution. Answer: A baccalaureate degree
may substitute for four (4) years of experience.
● Contact Hours Substitution. Answer: Ten (10) contact hours, one (1)
Continuing Education Unit, or one (1) postsecondary education quarter
hour with a passing grade shall substitute for 0.022 years of experience.
● Semester Hour Substitution. Answer: One (1) postsecondary education
semester hour with a passing grade shall substitute for 0.033 years of
experience.
● Class I Requirements. Answer: High School Diploma or GED and one
(1) year of acceptable operation of a wastewater treatment plant.
● Class II Requirements. Answer: High School Diploma or GED and
two (2) years of acceptable operation of a wastewater treatment plant.
● Class III Requirements. Answer: High School Diploma or GED and
three (3) years of acceptable operation of a wastewater treatment plant,
PREPARATION TEST 2026 QUESTIONS AND
CORRECT ANSWERS GRADED A+
● Certification Process. Answer: Certification is obtained by meeting
minimum education and experience requirements, submitting the
appropriate forms and fee, and passing the certification examination
with at least a 70%.
● Class I. Answer: Wastewater treatment plant with a design capacity of
≤50,000 GPD.
● Class II. Answer: Wastewater treatment plant with a design capacity of
50,001 GPD to ≤ 2,000,000 GPD.
● Class III. Answer: Wastewater treatment plant with a design capacity
of 2,000,001 to ≤ 7,500,000 GPD.
● Class IV. Answer: Wastewater treatment plant with a design capacity ≥
7,500,001 GPD.
● Education Substitution. Answer: Education in environmental
engineering, environmental technology, and biological, physical, or
, chemical sciences shall be substituted if it does not exceed fifty (50)
percent of the required experience.
● Associate Degree Substitution. Answer: An associate degree may
substitute for two (2) years of experience.
● Baccalaureate Degree Substitution. Answer: A baccalaureate degree
may substitute for four (4) years of experience.
● Contact Hours Substitution. Answer: Ten (10) contact hours, one (1)
Continuing Education Unit, or one (1) postsecondary education quarter
hour with a passing grade shall substitute for 0.022 years of experience.
● Semester Hour Substitution. Answer: One (1) postsecondary education
semester hour with a passing grade shall substitute for 0.033 years of
experience.
● Class I Requirements. Answer: High School Diploma or GED and one
(1) year of acceptable operation of a wastewater treatment plant.
● Class II Requirements. Answer: High School Diploma or GED and
two (2) years of acceptable operation of a wastewater treatment plant.
● Class III Requirements. Answer: High School Diploma or GED and
three (3) years of acceptable operation of a wastewater treatment plant,
