Page 1 of 82
CALIFORNIA CUSTODIAN CERTIFICATION
EXAM | 2026/2027 EDITION | VERIFIED
QUESTIONS WITH DETAILED ANSWERS AND
RATIONALES | BRAND NEW!
1. A custodian is preparing to strip and wax a vinyl composition tile
(VCT) floor in a California public school. According to the Cal/OSHA
Hazard Communication Standard, what is the mandatory first step the
custodian must take before handling the chemical stripping solution?
A. Pour the chemical concentrate directly into a standard mop bucket
and dilute it with hot water until it changes color
B. Retrieve and review the Safety Data Sheet (SDS) for the specific
stripping chemical to identify required Personal Protective Equipment
(PPE) and safe handling instructions
C. Apply a small amount of the chemical to a hidden corner of the floor
to test if the finish dissolves within five minutes
D. Notify the school principal via text message that floor maintenance is
beginning and request that the hallway be locked down
Cal/OSHA Hazard Communication regulations require employees to
review the Safety Data Sheet (SDS) before handling hazardous chemicals
to ensure proper PPE, ventilation, and emergency protocols are utilized.
The SDS provides critical information regarding chemical hazards, safe
handling procedures, and first-aid measures.
,Page 2 of 82
2. While performing routine evening cleaning in a laboratory space, a
custodian discovers an unlabeled plastic spray bottle containing a
clear liquid sitting next to a sink. What is the correct protocol for
handling this unknown substance under California workplace safety
guidelines?
A. Smell the contents of the bottle carefully to determine if it is water,
glass cleaner, or a bleach solution
B. Treat the bottle as a hazardous substance, do not use it, and
immediately report it to a supervisor or the environmental health and
safety officer
C. Pour the liquid down the sink drain while running cold water to safely
dilute and dispose of the unknown chemical
D. Write “Cleaner” on the bottle with a permanent marker so that it
satisfies the primary container labeling requirement
Unlabeled chemical containers pose significant safety risks. Custodians
should never guess the contents of a container, mix it with other
substances, or dispose of it down municipal drains without
authorization. The correct protocol is to treat unknown substances as
hazardous and report them through proper channels.
3. A custodian is cleaning a restroom using a two-bucket mopping
system. Which of the following best describes the primary advantage
of this system over a single-bucket approach?
A. It reduces the amount of water and cleaning chemical used
B. It prevents cross-contamination by keeping rinse water separate
from cleaning solution
,Page 3 of 82
C. It allows the use of hotter water to improve cleaning effectiveness
D. It eliminates the need for disinfectant in the cleaning solution
The two-bucket system uses one bucket for cleaning solution and
another for rinsing the mop, preventing the transfer of soil and
pathogens back into the cleaning solution. This maintains the efficacy of
the disinfectant and reduces cross-contamination, which is critical in
restrooms and other high-risk areas.
4. A custodian finds a used hypodermic needle in a trash can while
emptying waste receptacles. What is the correct procedure according
to the Bloodborne Pathogens Standard?
A. Pick it up with gloved hands and place it in the regular trash
B. Use a puncture-resistant sharps container and a mechanical device
such as tongs or a scoop for pickup
C. Flatten it with a broom before disposal to prevent it from poking
through the bag
D. Leave it in place and notify the school nurse only
The Bloodborne Pathogens Standard requires mechanical pickup using
tongs or a scoop and disposal in a puncture-resistant sharps container.
Never use hands to pick up sharps, even with gloves, as needlestick
injuries can transmit bloodborne pathogens.
5. A custodian is mopping a classroom floor. Which pattern minimizes
recontamination and is safest for the worker?
, Page 4 of 82
A. Figure-eight pattern starting from the door and working toward the
center
B. Random overlapping strokes covering the entire floor simultaneously
C. “S” pattern working from the farthest corner toward the exit
D. Circular pattern ending in the center of the room
Working from the farthest corner to the exit prevents walking over
cleaned areas, reducing recontamination and slip risk. This systematic
approach ensures complete coverage while maintaining a safe exit path
for the custodian.
6. A custodian in a California elementary school finds vomit in a
hallway. Which product classification must be used for cleanup?
A. All-purpose cleaner
B. Disinfectant effective against norovirus
C. Glass cleaner
D. Furniture polish
Norovirus is highly infectious and is a common cause of gastroenteritis
outbreaks in school settings. A disinfectant with a specific norovirus
claim is required per California Department of Public Health guidelines.
Standard all-purpose cleaners are not sufficient for bodily fluid cleanup.
7. How often should an automatic scrubber’s squeegee blades be
inspected?
A. Never, they are self-cleaning components
B. Monthly during scheduled maintenance
CALIFORNIA CUSTODIAN CERTIFICATION
EXAM | 2026/2027 EDITION | VERIFIED
QUESTIONS WITH DETAILED ANSWERS AND
RATIONALES | BRAND NEW!
1. A custodian is preparing to strip and wax a vinyl composition tile
(VCT) floor in a California public school. According to the Cal/OSHA
Hazard Communication Standard, what is the mandatory first step the
custodian must take before handling the chemical stripping solution?
A. Pour the chemical concentrate directly into a standard mop bucket
and dilute it with hot water until it changes color
B. Retrieve and review the Safety Data Sheet (SDS) for the specific
stripping chemical to identify required Personal Protective Equipment
(PPE) and safe handling instructions
C. Apply a small amount of the chemical to a hidden corner of the floor
to test if the finish dissolves within five minutes
D. Notify the school principal via text message that floor maintenance is
beginning and request that the hallway be locked down
Cal/OSHA Hazard Communication regulations require employees to
review the Safety Data Sheet (SDS) before handling hazardous chemicals
to ensure proper PPE, ventilation, and emergency protocols are utilized.
The SDS provides critical information regarding chemical hazards, safe
handling procedures, and first-aid measures.
,Page 2 of 82
2. While performing routine evening cleaning in a laboratory space, a
custodian discovers an unlabeled plastic spray bottle containing a
clear liquid sitting next to a sink. What is the correct protocol for
handling this unknown substance under California workplace safety
guidelines?
A. Smell the contents of the bottle carefully to determine if it is water,
glass cleaner, or a bleach solution
B. Treat the bottle as a hazardous substance, do not use it, and
immediately report it to a supervisor or the environmental health and
safety officer
C. Pour the liquid down the sink drain while running cold water to safely
dilute and dispose of the unknown chemical
D. Write “Cleaner” on the bottle with a permanent marker so that it
satisfies the primary container labeling requirement
Unlabeled chemical containers pose significant safety risks. Custodians
should never guess the contents of a container, mix it with other
substances, or dispose of it down municipal drains without
authorization. The correct protocol is to treat unknown substances as
hazardous and report them through proper channels.
3. A custodian is cleaning a restroom using a two-bucket mopping
system. Which of the following best describes the primary advantage
of this system over a single-bucket approach?
A. It reduces the amount of water and cleaning chemical used
B. It prevents cross-contamination by keeping rinse water separate
from cleaning solution
,Page 3 of 82
C. It allows the use of hotter water to improve cleaning effectiveness
D. It eliminates the need for disinfectant in the cleaning solution
The two-bucket system uses one bucket for cleaning solution and
another for rinsing the mop, preventing the transfer of soil and
pathogens back into the cleaning solution. This maintains the efficacy of
the disinfectant and reduces cross-contamination, which is critical in
restrooms and other high-risk areas.
4. A custodian finds a used hypodermic needle in a trash can while
emptying waste receptacles. What is the correct procedure according
to the Bloodborne Pathogens Standard?
A. Pick it up with gloved hands and place it in the regular trash
B. Use a puncture-resistant sharps container and a mechanical device
such as tongs or a scoop for pickup
C. Flatten it with a broom before disposal to prevent it from poking
through the bag
D. Leave it in place and notify the school nurse only
The Bloodborne Pathogens Standard requires mechanical pickup using
tongs or a scoop and disposal in a puncture-resistant sharps container.
Never use hands to pick up sharps, even with gloves, as needlestick
injuries can transmit bloodborne pathogens.
5. A custodian is mopping a classroom floor. Which pattern minimizes
recontamination and is safest for the worker?
, Page 4 of 82
A. Figure-eight pattern starting from the door and working toward the
center
B. Random overlapping strokes covering the entire floor simultaneously
C. “S” pattern working from the farthest corner toward the exit
D. Circular pattern ending in the center of the room
Working from the farthest corner to the exit prevents walking over
cleaned areas, reducing recontamination and slip risk. This systematic
approach ensures complete coverage while maintaining a safe exit path
for the custodian.
6. A custodian in a California elementary school finds vomit in a
hallway. Which product classification must be used for cleanup?
A. All-purpose cleaner
B. Disinfectant effective against norovirus
C. Glass cleaner
D. Furniture polish
Norovirus is highly infectious and is a common cause of gastroenteritis
outbreaks in school settings. A disinfectant with a specific norovirus
claim is required per California Department of Public Health guidelines.
Standard all-purpose cleaners are not sufficient for bodily fluid cleanup.
7. How often should an automatic scrubber’s squeegee blades be
inspected?
A. Never, they are self-cleaning components
B. Monthly during scheduled maintenance
