CWEA Laboratory Analyst Grade 3 Certification
Exam Practice Test 2026 | 100+ Questions and
Answers with Rationales
SECTION 1: REGULATORY COMPLIANCE & LABORATORY SAFETY
(Questions 1-20)
Question 1:
Under the Clean Water Act, National Pollutant Discharge Elimination System (NPDES)
discharge permits specify that wastewater compliance monitoring data must be
generated using analytical methods approved under which federal code section?
A) 40 CFR Part 141
B) *40 CFR Part 136*
C) 40 CFR Part 261
D) 22 CCR Section 64444
*Rationale: * 40 CFR Part 136 lists the approved biological, microbiological, radiological,
and chemical analytical methods authorized for compliance testing under the NPDES
wastewater program . Part 141 covers drinking water standards, Part 261 covers
hazardous waste, and Title 22 covers California-specific regulations.
,Question 2:
What is the maximum allowable 7-day median total coliform count for disinfected
tertiary recycled water under Title 22 regulations for unrestricted public use?
A) 23 MPN/100 mL
B) 2.2 MPN/100 mL
C) 0 CFU/100 mL
D) 100 CFU/100 mL
*Rationale: * Title 22 guidelines for disinfected tertiary recycled water require strict
pathogen mitigation, capping the 7-day median total coliform count at 2.2 MPN per 100
mL to protect public health during contact irrigation .
Question 3:
The California Environmental Laboratory Accreditation Program (ELAP) requires a
laboratory to notify the state board regarding a change in the designated Laboratory
Director or Technical Manager within how many days?
A) 10 days
B) 15 days
C) 30 days
D) 60 days
*Rationale: * Under ELAP requirements, laboratories must notify the state board within 30
days of a change in Laboratory Director or Technical Manager to maintain accreditation
status .
,Question 4:
Which government regulation requires laboratories to comply with analytical
procedures and reporting requirements for influent, effluent, and solids monitoring?
A) 40 CFR Part 261
B) NPDES Permit
C) OSHA 29 CFR 1910
D) DOT 49 CFR 172
*Rationale: * The Grade III analyst should be thoroughly familiar with the reporting
requirements of the NPDES permit for influent, effluent, solids, and downstream
monitoring. This includes knowledge of the pretreatment program .
Question 5:
Flammable solvents must be stored in which type of container to ensure laboratory
safety?
A) Open shelving near heat sources
B) Approved flammable storage cabinets away from ignition sources
C) Standard glass bottles on the benchtop
D) In the refrigerator with food items
*Rationale: * Flammable solvents must be stored in approved flammable storage cabinets
designed to contain fire and protect contents from heat. They should be kept away from
ignition sources and incompatible materials .
Question 6:
What is the primary purpose of conducting regular safety inspections in the laboratory?
, A) To evaluate analyst performance
B) To determine budget allocations
C) To identify and correct potential safety hazards before incidents occur
D) To fulfill insurance requirements only
*Rationale: * Regular safety inspections identify and correct potential safety hazards
before incidents occur, protecting staff, equipment, and the facility. They are a
fundamental component of laboratory safety management .
Question 7:
Which safety equipment is considered essential in a chemical laboratory?
A) Headphones
B) Safety goggles
C) Notebook
D) Calculator
*Rationale: * Safety goggles protect eyes from chemical splashes, fumes, and flying debris.
They are a mandatory personal protective equipment (PPE) item in any laboratory
handling hazardous materials .
Question 8:
Under 40 CFR Part 136, what is the maximum holding time for total residual chlorine
analysis?
A) 1 hour
B) 2 hours
Exam Practice Test 2026 | 100+ Questions and
Answers with Rationales
SECTION 1: REGULATORY COMPLIANCE & LABORATORY SAFETY
(Questions 1-20)
Question 1:
Under the Clean Water Act, National Pollutant Discharge Elimination System (NPDES)
discharge permits specify that wastewater compliance monitoring data must be
generated using analytical methods approved under which federal code section?
A) 40 CFR Part 141
B) *40 CFR Part 136*
C) 40 CFR Part 261
D) 22 CCR Section 64444
*Rationale: * 40 CFR Part 136 lists the approved biological, microbiological, radiological,
and chemical analytical methods authorized for compliance testing under the NPDES
wastewater program . Part 141 covers drinking water standards, Part 261 covers
hazardous waste, and Title 22 covers California-specific regulations.
,Question 2:
What is the maximum allowable 7-day median total coliform count for disinfected
tertiary recycled water under Title 22 regulations for unrestricted public use?
A) 23 MPN/100 mL
B) 2.2 MPN/100 mL
C) 0 CFU/100 mL
D) 100 CFU/100 mL
*Rationale: * Title 22 guidelines for disinfected tertiary recycled water require strict
pathogen mitigation, capping the 7-day median total coliform count at 2.2 MPN per 100
mL to protect public health during contact irrigation .
Question 3:
The California Environmental Laboratory Accreditation Program (ELAP) requires a
laboratory to notify the state board regarding a change in the designated Laboratory
Director or Technical Manager within how many days?
A) 10 days
B) 15 days
C) 30 days
D) 60 days
*Rationale: * Under ELAP requirements, laboratories must notify the state board within 30
days of a change in Laboratory Director or Technical Manager to maintain accreditation
status .
,Question 4:
Which government regulation requires laboratories to comply with analytical
procedures and reporting requirements for influent, effluent, and solids monitoring?
A) 40 CFR Part 261
B) NPDES Permit
C) OSHA 29 CFR 1910
D) DOT 49 CFR 172
*Rationale: * The Grade III analyst should be thoroughly familiar with the reporting
requirements of the NPDES permit for influent, effluent, solids, and downstream
monitoring. This includes knowledge of the pretreatment program .
Question 5:
Flammable solvents must be stored in which type of container to ensure laboratory
safety?
A) Open shelving near heat sources
B) Approved flammable storage cabinets away from ignition sources
C) Standard glass bottles on the benchtop
D) In the refrigerator with food items
*Rationale: * Flammable solvents must be stored in approved flammable storage cabinets
designed to contain fire and protect contents from heat. They should be kept away from
ignition sources and incompatible materials .
Question 6:
What is the primary purpose of conducting regular safety inspections in the laboratory?
, A) To evaluate analyst performance
B) To determine budget allocations
C) To identify and correct potential safety hazards before incidents occur
D) To fulfill insurance requirements only
*Rationale: * Regular safety inspections identify and correct potential safety hazards
before incidents occur, protecting staff, equipment, and the facility. They are a
fundamental component of laboratory safety management .
Question 7:
Which safety equipment is considered essential in a chemical laboratory?
A) Headphones
B) Safety goggles
C) Notebook
D) Calculator
*Rationale: * Safety goggles protect eyes from chemical splashes, fumes, and flying debris.
They are a mandatory personal protective equipment (PPE) item in any laboratory
handling hazardous materials .
Question 8:
Under 40 CFR Part 136, what is the maximum holding time for total residual chlorine
analysis?
A) 1 hour
B) 2 hours
