ICC California UST Service Technician Certification Exam
Prep Study Guide 2026 | Complete Underground Storage
Tank (UST) Training Manual, Practice Questions, Code
Compliance, Safety Procedures & Passing Strategies for ICC
Certification Success
Question 1: According to California Code of Regulations Title 23, Section 2611, which
individual is defined as a "service technician" for underground storage tank systems?
A. Any person who conducts visual inspections of UST facilities
B. Any individual who performs installations, repairs, tests, maintenance, service, programming,
diagnostics, or calibration of UST system components
C. Any employee who delivers fuel to underground storage tanks
D. Any contractor who excavates soil around UST systems
CORRECT ANSWER: B. Any individual who performs installations, repairs, tests, maintenance,
service, programming, diagnostics, or calibration of UST system components
Rationale: California Code of Regulations Title 23, Section 2611 explicitly defines a "service
technician" as an individual who performs installations or repairs of UST system components
that do not require excavation or backfill, performs tests on UST system components, or
provides maintenance, service, programming, diagnostics, or calibration of UST system
components. This definition is critical for determining licensing and certification requirements
under California UST regulations.
Question 2: How often must ICC California UST Service Technician certification be renewed?
A. Every 12 months
B. Every 18 months
C. Every 24 months
D. Every 36 months
CORRECT ANSWER: C. Every 24 months
Rationale: ICC California UST Service Technician certification must be renewed every 24 months
through successful completion of the ICC certification examination. This renewal requirement
ensures that service technicians maintain current knowledge of evolving regulations,
technologies, and best practices in underground storage tank system servicing and compliance.
Question 3: Which of the following activities requires a service technician to possess or work
under the direct supervision of an individual with current ICC California UST Service
Technician certification?
A. Conducting a visual inspection of dispenser containment
B. Entering serial commands to retrieve information from UST monitoring system consoles
C. Recording fuel delivery receipts
D. Cleaning spill buckets with absorbent materials
CORRECT ANSWER: B. Entering serial commands to retrieve information from UST monitoring
system consoles
Rationale: The California State Water Resources Control Board has clarified that entering serial
commands to retrieve UST monitoring system information constitutes "servicing" because
serial commands can alter system programming and affect operation. Therefore, this activity
must be performed by a qualified service technician meeting specific licensing and certification
,requirements, including ICC certification or working under direct supervision of an ICC-certified
technician physically present at the work site.
Question 4: What is the minimum probability of detection required for an integrity test
method on Type 1 underground storage tanks?
A. 90 percent with a probability of false alarm of 10 percent or less
B. 95 percent with a probability of false alarm of 5 percent or less
C. 99 percent with a probability of false alarm of 1 percent or less
D. 85 percent with a probability of false alarm of 15 percent or less
CORRECT ANSWER: B. 95 percent with a probability of false alarm of 5 percent or less
Rationale: Per California Code of Regulations Title 23, Section 2611, an "integrity test" is
defined as a volumetric or non-volumetric test method that can detect a release of 0.1 gallon
per hour for Type 1 underground storage tanks with a probability of detection of at least 95
percent and a probability of false alarm of five percent or less. This statistical performance
standard ensures reliable leak detection capability.
Question 5: Which document must a UST owner or operator submit to the Unified Program
Agency within 30 days of installing an underground storage tank system or changing the
designated UST operator?
A. UST Monitoring Plan only
B. Designated UST Operator Identification including name and ICC certification number
C. Annual financial responsibility certification
D. Emergency response contact list
CORRECT ANSWER: B. Designated UST Operator Identification including name and ICC
certification number
Rationale: California Code of Regulations Title 23, Section 2630(b) requires that within 30 days
of installing a UST system or any change to the designated underground storage tank
operator(s), the owner or operator must submit to the Unified Program Agency information
identifying the designated UST operator(s). The name listed must be identical to that on the
individual's International Code Council UST System Operator certificate, ensuring proper
verification of qualified personnel.
Question 6: What is the required notification timeframe for a Unified Program Agency before
conducting a test of underground storage tank components or systems?
A. 24 hours
B. 48 hours
C. 72 hours
D. 7 days
CORRECT ANSWER: C. 72 hours
Rationale: California Code of Regulations Title 23, Section 2614 requires that the underground
storage tank owner or operator must notify the Unified Program Agency in writing at least 72
hours prior to conducting a test of underground storage tank components or systems, unless
the notification requirement is waived by the Unified Program Agency. This advance notice
allows regulatory agencies to observe testing procedures and ensure compliance.
,Question 7: Which type of underground storage tank system is defined as being installed on
or after July 1, 2004?
A. Type 1 underground storage tank
B. Type 2 underground storage tank
C. Type 3 underground storage tank
D. Legacy underground storage tank
CORRECT ANSWER: C. Type 3 underground storage tank
Rationale: California Code of Regulations Title 23, Section 2611 defines tank types by
installation date: Type 1 tanks were installed before July 1, 2003; Type 2 tanks were installed on
or after July 1, 2003, and before July 1, 2004; and Type 3 tanks were installed on or after July 1,
2004. Type 3 tanks are subject to the most current construction and performance standards.
Question 8: For how long must cathodic protection test results be maintained on site or at an
approved off-site location?
A. 36 months
B. 60 months
C. 78 months
D. Life of the UST system
CORRECT ANSWER: C. 78 months
Rationale: California Code of Regulations Title 23, Section 2613(d) specifically requires that
cathodic protection test results be maintained on site, or off site at a readily accessible location
if approved by the Unified Program Agency, for no less than 78 months (6.5 years). This
extended retention period supports long-term corrosion protection verification and regulatory
oversight.
Question 9: Which of the following records must be maintained for the life of the
underground storage tank system?
A. Release detection equipment testing reports
B. Facility employee training certificates
C. Installation records including as-built drawings
D. Spill containment testing report forms
CORRECT ANSWER: C. Installation records including as-built drawings
Rationale: California Code of Regulations Title 23, Section 2613(e) requires that installation
records, including installation test results, manufacturer checklists and manuals, and as-built
drawings, be maintained for the life of the underground storage tank system. These
foundational documents are essential for future repairs, modifications, closure activities, and
regulatory compliance verification throughout the system's operational lifespan.
Question 10: What is the maximum allowable release detection sensitivity for an integrity
test on Type 2 and Type 3 underground storage tanks?
A. 0.1 gallon per hour
B. 0.05 gallon per hour
C. 0.01 gallon per hour
D. 0.005 gallon per hour
CORRECT ANSWER: D. 0.005 gallon per hour
, Rationale: Per California Code of Regulations Title 23, Section 2611, the definition of "integrity
test" specifies that test methods must be capable of detecting a release of 0.1 gallon per hour
for Type 1 underground storage tanks and 0.005 gallon per hour for Type 2 and Type 3
underground storage tanks, with a probability of detection of at least 95 percent and a
probability of false alarm of five percent or less. The more sensitive requirement for newer tank
types reflects enhanced leak detection expectations.
Question 11: Which individual must possess a current certificate from the National
Association of Corrosion Engineers or the International Code Council to perform cathodic
protection testing on buried metallic UST systems?
A. Corrosion specialist
B. Cathodic protection tester
C. Independent compliance inspector
D. Service technician
CORRECT ANSWER: B. Cathodic protection tester
Rationale: California Code of Regulations Title 23, Section 2611 defines a "cathodic protection
tester" as any individual who can demonstrate understanding of principles and measurements
of cathodic protection systems and must possess a current certificate issued by the National
Association of Corrosion Engineers or the International Code Council. This certification verifies
competency in soil resistivity, stray current, structure-to-soil potential, and component
electrical isolation measurements.
Question 12: What does the term "fail safe" mean in the context of UST release detection
systems?
A. The system automatically alerts the owner when a leak is detected
B. The system will shut down the pump in the event of a power outage or system failure
C. The system requires manual reset after each alarm
D. The system operates independently of electrical power
CORRECT ANSWER: B. The system will shut down the pump in the event of a power outage or
system failure
Rationale: California Code of Regulations Title 23, Section 2611 defines "fail safe" as a release
detection system characteristic that will shut down the pump in the event of a power outage,
or when the release detection system fails or is disconnected. This safety feature prevents
continued operation that could exacerbate a release or create hazardous conditions during
system malfunctions.
Question 13: Which of the following is NOT excluded from the definition of an underground
storage tank under California regulations?
A. A tank containing propane with vapor pressure exceeding 40 psi at 100°F
B. A septic tank designed for biological waste processing
C. A farm tank holding 1,000 gallons of petroleum for agricultural vehicle fueling
D. A steel tank installed in 2005 storing diesel fuel for commercial dispensing
CORRECT ANSWER: D. A steel tank installed in 2005 storing diesel fuel for commercial
dispensing
Prep Study Guide 2026 | Complete Underground Storage
Tank (UST) Training Manual, Practice Questions, Code
Compliance, Safety Procedures & Passing Strategies for ICC
Certification Success
Question 1: According to California Code of Regulations Title 23, Section 2611, which
individual is defined as a "service technician" for underground storage tank systems?
A. Any person who conducts visual inspections of UST facilities
B. Any individual who performs installations, repairs, tests, maintenance, service, programming,
diagnostics, or calibration of UST system components
C. Any employee who delivers fuel to underground storage tanks
D. Any contractor who excavates soil around UST systems
CORRECT ANSWER: B. Any individual who performs installations, repairs, tests, maintenance,
service, programming, diagnostics, or calibration of UST system components
Rationale: California Code of Regulations Title 23, Section 2611 explicitly defines a "service
technician" as an individual who performs installations or repairs of UST system components
that do not require excavation or backfill, performs tests on UST system components, or
provides maintenance, service, programming, diagnostics, or calibration of UST system
components. This definition is critical for determining licensing and certification requirements
under California UST regulations.
Question 2: How often must ICC California UST Service Technician certification be renewed?
A. Every 12 months
B. Every 18 months
C. Every 24 months
D. Every 36 months
CORRECT ANSWER: C. Every 24 months
Rationale: ICC California UST Service Technician certification must be renewed every 24 months
through successful completion of the ICC certification examination. This renewal requirement
ensures that service technicians maintain current knowledge of evolving regulations,
technologies, and best practices in underground storage tank system servicing and compliance.
Question 3: Which of the following activities requires a service technician to possess or work
under the direct supervision of an individual with current ICC California UST Service
Technician certification?
A. Conducting a visual inspection of dispenser containment
B. Entering serial commands to retrieve information from UST monitoring system consoles
C. Recording fuel delivery receipts
D. Cleaning spill buckets with absorbent materials
CORRECT ANSWER: B. Entering serial commands to retrieve information from UST monitoring
system consoles
Rationale: The California State Water Resources Control Board has clarified that entering serial
commands to retrieve UST monitoring system information constitutes "servicing" because
serial commands can alter system programming and affect operation. Therefore, this activity
must be performed by a qualified service technician meeting specific licensing and certification
,requirements, including ICC certification or working under direct supervision of an ICC-certified
technician physically present at the work site.
Question 4: What is the minimum probability of detection required for an integrity test
method on Type 1 underground storage tanks?
A. 90 percent with a probability of false alarm of 10 percent or less
B. 95 percent with a probability of false alarm of 5 percent or less
C. 99 percent with a probability of false alarm of 1 percent or less
D. 85 percent with a probability of false alarm of 15 percent or less
CORRECT ANSWER: B. 95 percent with a probability of false alarm of 5 percent or less
Rationale: Per California Code of Regulations Title 23, Section 2611, an "integrity test" is
defined as a volumetric or non-volumetric test method that can detect a release of 0.1 gallon
per hour for Type 1 underground storage tanks with a probability of detection of at least 95
percent and a probability of false alarm of five percent or less. This statistical performance
standard ensures reliable leak detection capability.
Question 5: Which document must a UST owner or operator submit to the Unified Program
Agency within 30 days of installing an underground storage tank system or changing the
designated UST operator?
A. UST Monitoring Plan only
B. Designated UST Operator Identification including name and ICC certification number
C. Annual financial responsibility certification
D. Emergency response contact list
CORRECT ANSWER: B. Designated UST Operator Identification including name and ICC
certification number
Rationale: California Code of Regulations Title 23, Section 2630(b) requires that within 30 days
of installing a UST system or any change to the designated underground storage tank
operator(s), the owner or operator must submit to the Unified Program Agency information
identifying the designated UST operator(s). The name listed must be identical to that on the
individual's International Code Council UST System Operator certificate, ensuring proper
verification of qualified personnel.
Question 6: What is the required notification timeframe for a Unified Program Agency before
conducting a test of underground storage tank components or systems?
A. 24 hours
B. 48 hours
C. 72 hours
D. 7 days
CORRECT ANSWER: C. 72 hours
Rationale: California Code of Regulations Title 23, Section 2614 requires that the underground
storage tank owner or operator must notify the Unified Program Agency in writing at least 72
hours prior to conducting a test of underground storage tank components or systems, unless
the notification requirement is waived by the Unified Program Agency. This advance notice
allows regulatory agencies to observe testing procedures and ensure compliance.
,Question 7: Which type of underground storage tank system is defined as being installed on
or after July 1, 2004?
A. Type 1 underground storage tank
B. Type 2 underground storage tank
C. Type 3 underground storage tank
D. Legacy underground storage tank
CORRECT ANSWER: C. Type 3 underground storage tank
Rationale: California Code of Regulations Title 23, Section 2611 defines tank types by
installation date: Type 1 tanks were installed before July 1, 2003; Type 2 tanks were installed on
or after July 1, 2003, and before July 1, 2004; and Type 3 tanks were installed on or after July 1,
2004. Type 3 tanks are subject to the most current construction and performance standards.
Question 8: For how long must cathodic protection test results be maintained on site or at an
approved off-site location?
A. 36 months
B. 60 months
C. 78 months
D. Life of the UST system
CORRECT ANSWER: C. 78 months
Rationale: California Code of Regulations Title 23, Section 2613(d) specifically requires that
cathodic protection test results be maintained on site, or off site at a readily accessible location
if approved by the Unified Program Agency, for no less than 78 months (6.5 years). This
extended retention period supports long-term corrosion protection verification and regulatory
oversight.
Question 9: Which of the following records must be maintained for the life of the
underground storage tank system?
A. Release detection equipment testing reports
B. Facility employee training certificates
C. Installation records including as-built drawings
D. Spill containment testing report forms
CORRECT ANSWER: C. Installation records including as-built drawings
Rationale: California Code of Regulations Title 23, Section 2613(e) requires that installation
records, including installation test results, manufacturer checklists and manuals, and as-built
drawings, be maintained for the life of the underground storage tank system. These
foundational documents are essential for future repairs, modifications, closure activities, and
regulatory compliance verification throughout the system's operational lifespan.
Question 10: What is the maximum allowable release detection sensitivity for an integrity
test on Type 2 and Type 3 underground storage tanks?
A. 0.1 gallon per hour
B. 0.05 gallon per hour
C. 0.01 gallon per hour
D. 0.005 gallon per hour
CORRECT ANSWER: D. 0.005 gallon per hour
, Rationale: Per California Code of Regulations Title 23, Section 2611, the definition of "integrity
test" specifies that test methods must be capable of detecting a release of 0.1 gallon per hour
for Type 1 underground storage tanks and 0.005 gallon per hour for Type 2 and Type 3
underground storage tanks, with a probability of detection of at least 95 percent and a
probability of false alarm of five percent or less. The more sensitive requirement for newer tank
types reflects enhanced leak detection expectations.
Question 11: Which individual must possess a current certificate from the National
Association of Corrosion Engineers or the International Code Council to perform cathodic
protection testing on buried metallic UST systems?
A. Corrosion specialist
B. Cathodic protection tester
C. Independent compliance inspector
D. Service technician
CORRECT ANSWER: B. Cathodic protection tester
Rationale: California Code of Regulations Title 23, Section 2611 defines a "cathodic protection
tester" as any individual who can demonstrate understanding of principles and measurements
of cathodic protection systems and must possess a current certificate issued by the National
Association of Corrosion Engineers or the International Code Council. This certification verifies
competency in soil resistivity, stray current, structure-to-soil potential, and component
electrical isolation measurements.
Question 12: What does the term "fail safe" mean in the context of UST release detection
systems?
A. The system automatically alerts the owner when a leak is detected
B. The system will shut down the pump in the event of a power outage or system failure
C. The system requires manual reset after each alarm
D. The system operates independently of electrical power
CORRECT ANSWER: B. The system will shut down the pump in the event of a power outage or
system failure
Rationale: California Code of Regulations Title 23, Section 2611 defines "fail safe" as a release
detection system characteristic that will shut down the pump in the event of a power outage,
or when the release detection system fails or is disconnected. This safety feature prevents
continued operation that could exacerbate a release or create hazardous conditions during
system malfunctions.
Question 13: Which of the following is NOT excluded from the definition of an underground
storage tank under California regulations?
A. A tank containing propane with vapor pressure exceeding 40 psi at 100°F
B. A septic tank designed for biological waste processing
C. A farm tank holding 1,000 gallons of petroleum for agricultural vehicle fueling
D. A steel tank installed in 2005 storing diesel fuel for commercial dispensing
CORRECT ANSWER: D. A steel tank installed in 2005 storing diesel fuel for commercial
dispensing
