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NEW JERSEY PUBLIC WASTEWATER
TREATMENT OPERATOR S3 EXAM
PRACTICE QUESTION BANK – 250+
QUESTIONS WITH VERIFIED ANSWERS &
RATIONALES
2026-2027 ACADEMIC YEAR | UPDATED
PER LATEST NJDEP GUIDELINES |
GRADED A+
# SECTION I: REGULATORY FRAMEWORK & NJDEP REQUIREMENTS
## NJAC 7:14A Regulations
### Question 1
Under NJAC 7:14A-23, a New Jersey wastewater treatment facility with an S3 classification
must have a certified operator in responsible charge at all times. What is the minimum required
certified operator level for an S3 facility?
A) S1
B) S2
C) S3
D) S4
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**Correct Answer: C**
**Rationale:** S3 facilities require at least one S3-certified operator in responsible charge. S4 is
a higher classification reserved for very complex facilities with advanced treatment
requirements. An S1 or S2 operator does not meet the minimum certification level required by
regulation for an S3 facility.
---
### Question 2
Under NJAC 7:14A, which of the following is the primary purpose of the New Jersey Pollutant
Discharge Elimination System (NJPDES) program?
A) To issue drinking water permits to public water systems
B) To control and regulate discharges of pollutants into surface waters of the state
C) To establish maximum contaminant levels for drinking water
D) To regulate air emissions from wastewater treatment plants
**Correct Answer: B**
**Rationale:** The NJPDES program, established under NJAC 7:14A, is New Jersey's
implementation of the federal NPDES program. Its primary purpose is to control pollutant
discharges to surface waters through permitting, monitoring, and enforcement. Options A and C
pertain to drinking water regulations, while D pertains to air quality regulations.
---
### Question 3
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According to NJDEP regulations, what is the maximum allowable 7-day average CBOD₅
concentration for an industrial facility discharging to a surface water classified as FW2
(freshwater, non-trout)?
A) 10 mg/L
B) 15 mg/L
C) 20 mg/L
D) 25 mg/L
**Correct Answer: C**
**Rationale:** Under NJAC 7:14A-13, the maximum allowable 7-day average CBOD₅
concentration for discharges to FW2 waters is 20 mg/L. FW2 waters are designated for non-trout
freshwater uses. The 5-day carbonaceous biochemical oxygen demand (CBOD₅) is a key effluent
parameter used to measure the organic strength of wastewater discharges.
---
### Question 4
An S3 operator discovers that effluent samples have exceeded permit limits for two consecutive
months. Under NJAC 7:14A, what is the operator's PRIMARY responsibility?
A) Ignore the violations until the next permit renewal
B) Immediately notify the NJDEP and implement corrective actions
C) Dispose of the non-compliant samples and retest
D) Continue normal operations and wait for the next inspection
**Correct Answer: B**
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**Rationale:** NJAC 7:14A requires operators to report permit violations promptly to the
NJDEP. The operator must also take immediate corrective action to address the cause of the
exceedance and prevent future violations. Ignoring violations, falsifying records, or delaying
notification are violations of the permit and can result in penalties.
---
### Question 5
Which of the following is NOT a required component of an NJPDES permit application for an
S3 industrial facility?
A) Facility description and flow diagram
B) Effluent characteristics and discharge points
C) Employee payroll records
D) Pollution prevention plan
**Correct Answer: C**
**Rationale:** NJPDES permit applications require facility descriptions, process flow diagrams,
effluent characteristics, discharge point information, and pollution prevention plans. Employee
payroll records are not a required component of the permit application and are unrelated to
discharge compliance.
---
### Question 6
Under NJAC 7:14A, what is the maximum civil administrative penalty that can be assessed per
day for each violation of the New Jersey Water Pollution Control Act?
A) $5,000
NEW JERSEY PUBLIC WASTEWATER
TREATMENT OPERATOR S3 EXAM
PRACTICE QUESTION BANK – 250+
QUESTIONS WITH VERIFIED ANSWERS &
RATIONALES
2026-2027 ACADEMIC YEAR | UPDATED
PER LATEST NJDEP GUIDELINES |
GRADED A+
# SECTION I: REGULATORY FRAMEWORK & NJDEP REQUIREMENTS
## NJAC 7:14A Regulations
### Question 1
Under NJAC 7:14A-23, a New Jersey wastewater treatment facility with an S3 classification
must have a certified operator in responsible charge at all times. What is the minimum required
certified operator level for an S3 facility?
A) S1
B) S2
C) S3
D) S4
,Page 2 of 151
**Correct Answer: C**
**Rationale:** S3 facilities require at least one S3-certified operator in responsible charge. S4 is
a higher classification reserved for very complex facilities with advanced treatment
requirements. An S1 or S2 operator does not meet the minimum certification level required by
regulation for an S3 facility.
---
### Question 2
Under NJAC 7:14A, which of the following is the primary purpose of the New Jersey Pollutant
Discharge Elimination System (NJPDES) program?
A) To issue drinking water permits to public water systems
B) To control and regulate discharges of pollutants into surface waters of the state
C) To establish maximum contaminant levels for drinking water
D) To regulate air emissions from wastewater treatment plants
**Correct Answer: B**
**Rationale:** The NJPDES program, established under NJAC 7:14A, is New Jersey's
implementation of the federal NPDES program. Its primary purpose is to control pollutant
discharges to surface waters through permitting, monitoring, and enforcement. Options A and C
pertain to drinking water regulations, while D pertains to air quality regulations.
---
### Question 3
,Page 3 of 151
According to NJDEP regulations, what is the maximum allowable 7-day average CBOD₅
concentration for an industrial facility discharging to a surface water classified as FW2
(freshwater, non-trout)?
A) 10 mg/L
B) 15 mg/L
C) 20 mg/L
D) 25 mg/L
**Correct Answer: C**
**Rationale:** Under NJAC 7:14A-13, the maximum allowable 7-day average CBOD₅
concentration for discharges to FW2 waters is 20 mg/L. FW2 waters are designated for non-trout
freshwater uses. The 5-day carbonaceous biochemical oxygen demand (CBOD₅) is a key effluent
parameter used to measure the organic strength of wastewater discharges.
---
### Question 4
An S3 operator discovers that effluent samples have exceeded permit limits for two consecutive
months. Under NJAC 7:14A, what is the operator's PRIMARY responsibility?
A) Ignore the violations until the next permit renewal
B) Immediately notify the NJDEP and implement corrective actions
C) Dispose of the non-compliant samples and retest
D) Continue normal operations and wait for the next inspection
**Correct Answer: B**
, Page 4 of 151
**Rationale:** NJAC 7:14A requires operators to report permit violations promptly to the
NJDEP. The operator must also take immediate corrective action to address the cause of the
exceedance and prevent future violations. Ignoring violations, falsifying records, or delaying
notification are violations of the permit and can result in penalties.
---
### Question 5
Which of the following is NOT a required component of an NJPDES permit application for an
S3 industrial facility?
A) Facility description and flow diagram
B) Effluent characteristics and discharge points
C) Employee payroll records
D) Pollution prevention plan
**Correct Answer: C**
**Rationale:** NJPDES permit applications require facility descriptions, process flow diagrams,
effluent characteristics, discharge point information, and pollution prevention plans. Employee
payroll records are not a required component of the permit application and are unrelated to
discharge compliance.
---
### Question 6
Under NJAC 7:14A, what is the maximum civil administrative penalty that can be assessed per
day for each violation of the New Jersey Water Pollution Control Act?
A) $5,000
