CALIFORNIA CUSTODIAN CERTIFICATION EXAM PRACTICE | COMPREHENSIVE
STUDY GUIDE | ADVANCED TESTBANK | PRACTICE QUESTIONS & ANSWERS | LATEST
UPDATE 2026/2027
I. Occupational Safety, Cal/OSHA & Hazard Communication
II. Chemical Handling, SDS & PPE
III. Bloodborne Pathogens & Infection Prevention
IV. Cleaning Science, Sanitation & Disinfection
V. Floor Care, Surfaces & Specialized Cleaning
VI. Custodial Equipment, Ergonomics & Troubleshooting
VII. Waste Management, Spill Response & Environmental Practices
VIII. Facility Safety, Inspection, Documentation & Professional Judgment
INTRODUCTION
This advanced practice examination is designed for candidates preparing for California
custodian examinations and professional custodial responsibilities in 2026/2027.
California state Custodian I and Custodian II examinations emphasize professional
cleaning experience and the ability to perform custodial work safely and
effectively. The questions below emphasize applied judgment rather than simple
memorization, including chemical safety, hazard communication, sanitation,
bloodborne-pathogen precautions, equipment operation, floor care, ergonomics,
documentation, and workplace safety. California’s Hazard Communication and
Bloodborne Pathogens requirements are particularly important for custodial personnel
who may encounter hazardous chemicals, blood, sharps, or contaminated surfaces.
QUESTION 1
A custodian discovers that a concentrated disinfectant has been transferred from its
original container into a secondary spray bottle. The secondary bottle has no label, and
the custodian cannot immediately determine its contents. What is the most appropriate
action?
A. Use the product only on nonporous surfaces
B. Smell the liquid to identify the product
C. Stop using the container until its contents and required labeling are verified
D. Dilute the product with water before using it
🔴 Correct Answer: C. Stop using the container until its contents and required
labeling are verified.
,🔵 Explanation: An unidentified chemical presents an uncontrolled exposure hazard. The
custodian should not rely on smell, appearance, or dilution to identify it. Chemical
containers and workplace chemical information must be properly managed under
hazard-communication requirements.
QUESTION 2
A custodian is instructed to clean a restroom using a chlorine-based disinfectant. The
previous worker left an ammonia-based cleaner in the same bucket. What should the
custodian do?
A. Add additional chlorine disinfectant to neutralize the ammonia
B. Mix the products only after opening the restroom ventilation system
C. Dispose of the mixture according to established procedures and prepare the
disinfectant using a clean container
D. Add water until the chemical odor becomes less noticeable
🔴 Correct Answer: C. Dispose of the mixture according to established procedures
and prepare the disinfectant using a clean container.
🔵 Explanation: Chlorine-containing products must not be mixed with ammonia-
containing products because dangerous chemical reactions can generate toxic gases. The
correct response is to avoid the mixture, follow the facility's spill or chemical-disposal
procedure, and prepare chemicals according to their labels and SDS information.
QUESTION 3
A custodian experiences repeated skin irritation after using a concentrated cleaning
chemical even though gloves are worn. Which approach best addresses the underlying
problem?
A. Increase the chemical concentration so less product is needed
B. Review the SDS, verify glove compatibility, evaluate the dilution procedure, and
report the exposure concern
C. Replace gloves with bare hands to improve dexterity
D. Use the product only during the evening shift
🔴 Correct Answer: B. Review the SDS, verify glove compatibility, evaluate the
dilution procedure, and report the exposure concern.
🔵 Explanation: Effective chemical protection requires evaluating the hazard, exposure
pathway, PPE compatibility, and work practices. Gloves are not automatically appropriate
for every chemical, and improper concentration can increase exposure risk.
,QUESTION 4
A custodian must select PPE before cleaning a surface contaminated with blood. Which
principle should govern the selection?
A. Use the same PPE for every custodial task
B. Select PPE based on the anticipated exposure and the task being performed
C. Gloves alone are always sufficient
D. PPE is unnecessary if the contamination appears dry
🔴 Correct Answer: B. Select PPE based on the anticipated exposure and the task
being performed.
🔵 Explanation: Blood and potentially infectious materials must be treated as potential
biological hazards. PPE should be selected according to the reasonably anticipated
exposure, including the possibility of skin, eye, mucous-membrane, or other contact.
QUESTION 5
A custodian finds a used needle on a restroom floor. Which response demonstrates the
best professional judgment?
A. Pick it up by hand while wearing disposable gloves
B. Push it into an ordinary trash bag using a broom
C. Follow the facility's sharps-handling procedure and use appropriate engineering
controls or sharps equipment
D. Leave it where it is because custodians are never responsible for sharps
🔴 Correct Answer: C. Follow the facility's sharps-handling procedure and use
appropriate engineering controls or sharps equipment.
🔵 Explanation: Sharps can create a serious exposure incident. Custodians who may
encounter contaminated sharps require appropriate procedures, work practices, and
controls designed to prevent puncture injuries and exposure to bloodborne pathogens.
QUESTION 6
A custodian is cleaning a blood-contaminated countertop. Which factor is LEAST
appropriate as the primary basis for selecting the cleaning and decontamination
method?
A. Type of surface
B. Type and extent of contamination
, C. Location and task being performed
D. Personal preference regarding fragrance
🔴 Correct Answer: D. Personal preference regarding fragrance.
🔵 Explanation: California's bloodborne-pathogen requirements require cleaning and
decontamination methods to be appropriate to the location, surface or equipment,
contamination, and task. Fragrance preference is not a controlling technical criterion.
QUESTION 7
During restroom cleaning, a custodian notices that a disinfectant label specifies a
required contact time. The custodian is under pressure to finish quickly. What is the
most defensible procedure?
A. Wipe the product away immediately because mechanical action is sufficient
B. Use a higher concentration to compensate for reduced contact time
C. Follow the product label's specified use and contact-time requirements
D. Substitute another chemical without notifying anyone
🔴 Correct Answer: C. Follow the product label's specified use and contact-time
requirements.
🔵 Explanation: Disinfectants are evaluated and used according to specified conditions.
Shortening the required contact time can compromise disinfection effectiveness, while
unauthorized concentration changes can create safety and performance problems.
QUESTION 8
A custodian must clean an area where a chemical spill occurred. The SDS specifies
respiratory protection under certain exposure conditions. Which action should occur
before beginning cleanup?
A. Begin cleaning immediately because the chemical is already on the floor
B. Review the SDS and established spill-response procedure and ensure required
controls and PPE are available
C. Dilute the spill with water regardless of chemical identity
D. Cover the spill with paper towels and continue normal duties
🔴 Correct Answer: B. Review the SDS and established spill-response procedure and
ensure required controls and PPE are available.
🔵 Explanation: Spill response must be based on the identity and hazards of the
chemical, applicable procedures, and the required controls and PPE. Improvising with
water or absorbent materials can worsen some chemical hazards.
STUDY GUIDE | ADVANCED TESTBANK | PRACTICE QUESTIONS & ANSWERS | LATEST
UPDATE 2026/2027
I. Occupational Safety, Cal/OSHA & Hazard Communication
II. Chemical Handling, SDS & PPE
III. Bloodborne Pathogens & Infection Prevention
IV. Cleaning Science, Sanitation & Disinfection
V. Floor Care, Surfaces & Specialized Cleaning
VI. Custodial Equipment, Ergonomics & Troubleshooting
VII. Waste Management, Spill Response & Environmental Practices
VIII. Facility Safety, Inspection, Documentation & Professional Judgment
INTRODUCTION
This advanced practice examination is designed for candidates preparing for California
custodian examinations and professional custodial responsibilities in 2026/2027.
California state Custodian I and Custodian II examinations emphasize professional
cleaning experience and the ability to perform custodial work safely and
effectively. The questions below emphasize applied judgment rather than simple
memorization, including chemical safety, hazard communication, sanitation,
bloodborne-pathogen precautions, equipment operation, floor care, ergonomics,
documentation, and workplace safety. California’s Hazard Communication and
Bloodborne Pathogens requirements are particularly important for custodial personnel
who may encounter hazardous chemicals, blood, sharps, or contaminated surfaces.
QUESTION 1
A custodian discovers that a concentrated disinfectant has been transferred from its
original container into a secondary spray bottle. The secondary bottle has no label, and
the custodian cannot immediately determine its contents. What is the most appropriate
action?
A. Use the product only on nonporous surfaces
B. Smell the liquid to identify the product
C. Stop using the container until its contents and required labeling are verified
D. Dilute the product with water before using it
🔴 Correct Answer: C. Stop using the container until its contents and required
labeling are verified.
,🔵 Explanation: An unidentified chemical presents an uncontrolled exposure hazard. The
custodian should not rely on smell, appearance, or dilution to identify it. Chemical
containers and workplace chemical information must be properly managed under
hazard-communication requirements.
QUESTION 2
A custodian is instructed to clean a restroom using a chlorine-based disinfectant. The
previous worker left an ammonia-based cleaner in the same bucket. What should the
custodian do?
A. Add additional chlorine disinfectant to neutralize the ammonia
B. Mix the products only after opening the restroom ventilation system
C. Dispose of the mixture according to established procedures and prepare the
disinfectant using a clean container
D. Add water until the chemical odor becomes less noticeable
🔴 Correct Answer: C. Dispose of the mixture according to established procedures
and prepare the disinfectant using a clean container.
🔵 Explanation: Chlorine-containing products must not be mixed with ammonia-
containing products because dangerous chemical reactions can generate toxic gases. The
correct response is to avoid the mixture, follow the facility's spill or chemical-disposal
procedure, and prepare chemicals according to their labels and SDS information.
QUESTION 3
A custodian experiences repeated skin irritation after using a concentrated cleaning
chemical even though gloves are worn. Which approach best addresses the underlying
problem?
A. Increase the chemical concentration so less product is needed
B. Review the SDS, verify glove compatibility, evaluate the dilution procedure, and
report the exposure concern
C. Replace gloves with bare hands to improve dexterity
D. Use the product only during the evening shift
🔴 Correct Answer: B. Review the SDS, verify glove compatibility, evaluate the
dilution procedure, and report the exposure concern.
🔵 Explanation: Effective chemical protection requires evaluating the hazard, exposure
pathway, PPE compatibility, and work practices. Gloves are not automatically appropriate
for every chemical, and improper concentration can increase exposure risk.
,QUESTION 4
A custodian must select PPE before cleaning a surface contaminated with blood. Which
principle should govern the selection?
A. Use the same PPE for every custodial task
B. Select PPE based on the anticipated exposure and the task being performed
C. Gloves alone are always sufficient
D. PPE is unnecessary if the contamination appears dry
🔴 Correct Answer: B. Select PPE based on the anticipated exposure and the task
being performed.
🔵 Explanation: Blood and potentially infectious materials must be treated as potential
biological hazards. PPE should be selected according to the reasonably anticipated
exposure, including the possibility of skin, eye, mucous-membrane, or other contact.
QUESTION 5
A custodian finds a used needle on a restroom floor. Which response demonstrates the
best professional judgment?
A. Pick it up by hand while wearing disposable gloves
B. Push it into an ordinary trash bag using a broom
C. Follow the facility's sharps-handling procedure and use appropriate engineering
controls or sharps equipment
D. Leave it where it is because custodians are never responsible for sharps
🔴 Correct Answer: C. Follow the facility's sharps-handling procedure and use
appropriate engineering controls or sharps equipment.
🔵 Explanation: Sharps can create a serious exposure incident. Custodians who may
encounter contaminated sharps require appropriate procedures, work practices, and
controls designed to prevent puncture injuries and exposure to bloodborne pathogens.
QUESTION 6
A custodian is cleaning a blood-contaminated countertop. Which factor is LEAST
appropriate as the primary basis for selecting the cleaning and decontamination
method?
A. Type of surface
B. Type and extent of contamination
, C. Location and task being performed
D. Personal preference regarding fragrance
🔴 Correct Answer: D. Personal preference regarding fragrance.
🔵 Explanation: California's bloodborne-pathogen requirements require cleaning and
decontamination methods to be appropriate to the location, surface or equipment,
contamination, and task. Fragrance preference is not a controlling technical criterion.
QUESTION 7
During restroom cleaning, a custodian notices that a disinfectant label specifies a
required contact time. The custodian is under pressure to finish quickly. What is the
most defensible procedure?
A. Wipe the product away immediately because mechanical action is sufficient
B. Use a higher concentration to compensate for reduced contact time
C. Follow the product label's specified use and contact-time requirements
D. Substitute another chemical without notifying anyone
🔴 Correct Answer: C. Follow the product label's specified use and contact-time
requirements.
🔵 Explanation: Disinfectants are evaluated and used according to specified conditions.
Shortening the required contact time can compromise disinfection effectiveness, while
unauthorized concentration changes can create safety and performance problems.
QUESTION 8
A custodian must clean an area where a chemical spill occurred. The SDS specifies
respiratory protection under certain exposure conditions. Which action should occur
before beginning cleanup?
A. Begin cleaning immediately because the chemical is already on the floor
B. Review the SDS and established spill-response procedure and ensure required
controls and PPE are available
C. Dilute the spill with water regardless of chemical identity
D. Cover the spill with paper towels and continue normal duties
🔴 Correct Answer: B. Review the SDS and established spill-response procedure and
ensure required controls and PPE are available.
🔵 Explanation: Spill response must be based on the identity and hazards of the
chemical, applicable procedures, and the required controls and PPE. Improvising with
water or absorbent materials can worsen some chemical hazards.
