[CALIFORNIA CUSTODIAN CERTIFICATION EXAM TEST] QUESTIONS AND CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A | INSTANT DOWNLOAD PDF
Core Domains
Health and Safety Regulations (California Specific)
Hazardous Communications and Chemical Safety
Bloodborne Pathogens and Infection Control
Floor Care and Maintenance Procedures
Restroom Sanitation and Replenishment
Green Cleaning and Sustainable Practices
Legal Compliance (OSHA, Cal/OSHA, ADA)
Professional Ethics and Workplace Conduct
Equipment Operation and Preventive Maintenance
Emergency Response and Incident Reporting
Introduction
*This comprehensive assessment is designed to evaluate candidate readiness for the California Custodian
Certification Examination. It measures foundational knowledge of custodial science, applied skills in sanitation
and safety protocols, and critical decision-making within regulatory frameworks, including Cal/OSHA and ADA
standards. The exam consists of 200 multiple-choice questions, including scenario-based items that test real-
world judgment. Each question provides a verified correct answer with a detailed rationale to support mastery.
,This document emphasizes practical application, legal compliance, and ethical conduct essential for professional
custodians working in California educational, commercial, and government facilities.*
SECTION ONE: QUESTIONS 1–100
Question 1
A custodian notices a wet floor near a drinking fountain but no caution sign is present. What is the FIRST
required action?
A. Mop the area immediately
B. Place a wet floor warning sign and then dry the area
C. Report the hazard to a supervisor before acting
D. Ignore it if no one is nearby
🟢B
🔴 RATIONALE: California workplace safety standards (Cal/OSHA) require immediate warning of slip hazards.
Placing a sign first protects others while the custodian addresses the spill.
Question 2
Which document must an employer maintain for each hazardous chemical used in a California school custodial
closet?
A. Material Safety Data Sheet (old format)
B. Safety Data Sheet (SDS)
C. Chemical Inventory Log only
D. Product warranty certificate
,🟢B
🔴 RATIONALE: Under Cal/OSHA’s Hazard Communication Standard, employers must maintain current Safety
Data Sheets (SDS) for all hazardous chemicals. Older MSDS are not compliant.
Question 3
A custodian mixes bleach and ammonia to remove a tough stain. What is the primary risk?
A. Reduced cleaning effectiveness
B. Production of toxic chloramine gas
C. Damage to floor finish
D. Increased bacterial growth
🟢B
🔴 RATIONALE: Bleach (sodium hypochlorite) and ammonia react to form chloramine gas, which can cause
severe respiratory injury or death. This is a prohibited practice.
Question 4
Under California Green Cleaning mandates (AB 316), which is required for K-12 schools?
A. All cleaning products must be fragrance-free
B. All cleaning products must meet specific environmental standards
C. Only restroom cleaners must be green certified
D. Green cleaning is optional if costs exceed budget
🟢B
🔴 RATIONALE: AB 316 requires California K-12 schools to use cleaning products that meet recognized
environmental standards such as Green Seal or EcoLogo.
, Question 5
A custodian finds a used hypodermic needle in a trash can. What is the correct procedure?
A. Pick it up with gloved hands and place in trash
B. Use a puncture-resistant sharps container and a mechanical device
C. Flatten it with a broom before disposal
D. Leave it and notify a nurse only
🟢B
🔴 RATIONALE: Bloodborne Pathogens Standard requires mechanical pickup (tongs/scoop) and disposal in a
puncture-resistant sharps container. Never use hands.
Question 6
What is the minimum recommended dwell time for a quaternary ammonium disinfectant on a non-porous
surface?
A. 10 seconds
B. 30 seconds
C. 1 minute
D. 10 minutes
🟢C
🔴 RATIONALE: Most quat-based disinfectants require a wet contact time of 1–10 minutes. The minimum
common standard is 1 minute; always follow label instructions.
Question 7
A custodian is mopping a classroom floor. Which pattern minimizes recontamination and is safest?
A. Figure-eight pattern starting from the door
B. Random overlapping strokes
ANSWERS) PLUS RATIONALES 2026 Q&A | INSTANT DOWNLOAD PDF
Core Domains
Health and Safety Regulations (California Specific)
Hazardous Communications and Chemical Safety
Bloodborne Pathogens and Infection Control
Floor Care and Maintenance Procedures
Restroom Sanitation and Replenishment
Green Cleaning and Sustainable Practices
Legal Compliance (OSHA, Cal/OSHA, ADA)
Professional Ethics and Workplace Conduct
Equipment Operation and Preventive Maintenance
Emergency Response and Incident Reporting
Introduction
*This comprehensive assessment is designed to evaluate candidate readiness for the California Custodian
Certification Examination. It measures foundational knowledge of custodial science, applied skills in sanitation
and safety protocols, and critical decision-making within regulatory frameworks, including Cal/OSHA and ADA
standards. The exam consists of 200 multiple-choice questions, including scenario-based items that test real-
world judgment. Each question provides a verified correct answer with a detailed rationale to support mastery.
,This document emphasizes practical application, legal compliance, and ethical conduct essential for professional
custodians working in California educational, commercial, and government facilities.*
SECTION ONE: QUESTIONS 1–100
Question 1
A custodian notices a wet floor near a drinking fountain but no caution sign is present. What is the FIRST
required action?
A. Mop the area immediately
B. Place a wet floor warning sign and then dry the area
C. Report the hazard to a supervisor before acting
D. Ignore it if no one is nearby
🟢B
🔴 RATIONALE: California workplace safety standards (Cal/OSHA) require immediate warning of slip hazards.
Placing a sign first protects others while the custodian addresses the spill.
Question 2
Which document must an employer maintain for each hazardous chemical used in a California school custodial
closet?
A. Material Safety Data Sheet (old format)
B. Safety Data Sheet (SDS)
C. Chemical Inventory Log only
D. Product warranty certificate
,🟢B
🔴 RATIONALE: Under Cal/OSHA’s Hazard Communication Standard, employers must maintain current Safety
Data Sheets (SDS) for all hazardous chemicals. Older MSDS are not compliant.
Question 3
A custodian mixes bleach and ammonia to remove a tough stain. What is the primary risk?
A. Reduced cleaning effectiveness
B. Production of toxic chloramine gas
C. Damage to floor finish
D. Increased bacterial growth
🟢B
🔴 RATIONALE: Bleach (sodium hypochlorite) and ammonia react to form chloramine gas, which can cause
severe respiratory injury or death. This is a prohibited practice.
Question 4
Under California Green Cleaning mandates (AB 316), which is required for K-12 schools?
A. All cleaning products must be fragrance-free
B. All cleaning products must meet specific environmental standards
C. Only restroom cleaners must be green certified
D. Green cleaning is optional if costs exceed budget
🟢B
🔴 RATIONALE: AB 316 requires California K-12 schools to use cleaning products that meet recognized
environmental standards such as Green Seal or EcoLogo.
, Question 5
A custodian finds a used hypodermic needle in a trash can. What is the correct procedure?
A. Pick it up with gloved hands and place in trash
B. Use a puncture-resistant sharps container and a mechanical device
C. Flatten it with a broom before disposal
D. Leave it and notify a nurse only
🟢B
🔴 RATIONALE: Bloodborne Pathogens Standard requires mechanical pickup (tongs/scoop) and disposal in a
puncture-resistant sharps container. Never use hands.
Question 6
What is the minimum recommended dwell time for a quaternary ammonium disinfectant on a non-porous
surface?
A. 10 seconds
B. 30 seconds
C. 1 minute
D. 10 minutes
🟢C
🔴 RATIONALE: Most quat-based disinfectants require a wet contact time of 1–10 minutes. The minimum
common standard is 1 minute; always follow label instructions.
Question 7
A custodian is mopping a classroom floor. Which pattern minimizes recontamination and is safest?
A. Figure-eight pattern starting from the door
B. Random overlapping strokes
