ICC California UST Service Technician
Certification Exam Study Guide 2025 |
Underground Storage Tank Inspection,
Maintenance, Compliance Regulations,
Safety Procedures, Practice Questions,
Verified Answers, and Exam Preparation
Materials for ICC Certification Success
Question 1: Which of the following best defines a California UST Service Technician according to state
regulations?
A. An individual who installs new underground storage tanks without oversight
B. A person responsible for daily facility operations and emergency response
C. Any individual who performs tank removals exclusively for decommissioned sites
D. Any individual who tests UST monitoring equipment, troubleshoots UST systems, and/or installs UST
monitoring equipment
CORRECT ANSWER: D. Any individual who tests UST monitoring equipment, troubleshoots UST
systems, and/or installs UST monitoring equipment
RATIONALE: According to California regulatory definitions and exam preparation materials, a UST
Service Technician is specifically defined as someone who tests, troubleshoots, or installs UST
monitoring equipment. This role is distinct from that of a Designated Operator and requires ICC
certification
Quizlet
.
Question 2: How often must an ICC California UST Service Technician renew their certification?
A. Every 12 months
B. Every 18 months
C. Every 24 months
D. Every 36 months
CORRECT ANSWER: C. Every 24 months
RATIONALE: California Code of Regulations Title 23, Section 2715(i) mandates that individuals holding
an ICC California UST Service Technician certification must renew it by passing the exam every 24
months to remain compliant
www.law.cornell.edu
.
Question 3: What is the primary purpose of secondary containment testing for UST systems in
California?
,A. To verify aesthetic integrity of the tank exterior
B. To confirm the system can contain a release from the primary tank
C. To assess soil composition around the tank
D. To measure fuel evaporation rates
CORRECT ANSWER: B. To confirm the system can contain a release from the primary tank
RATIONALE: Secondary containment systems are designed to capture leaks or spills from the primary
tank. Testing ensures the secondary barrier remains intact and functional, preventing environmental
contamination as required under Title 23 CCR Section 2637
www.waterboards.ca.gov
.
Question 4: According to California regulations, how frequently must spill containers (spill buckets) be
tested?
A. Every 6 months
B. Every 12 months
C. Every 24 months
D. Only after a spill occurs
CORRECT ANSWER: B. Every 12 months
RATIONALE: Spill containers must be tested upon installation, at least once every 12 calendar months
thereafter, and following any repair, per California Code of Regulations Title 23, Section 2637.1(a)
www.waterboards.ca.gov
.
Question 5: Which method is approved for leak detection in single-wall USTs in California?
A. Visual inspection only
B. Inventory reconciliation alone
C. Automatic tank gauging with monthly testing
D. Annual pressure testing without documentation
CORRECT ANSWER: C. Automatic tank gauging with monthly testing
RATIONALE: California regulations permit automatic tank gauging (ATG) as a quantitative release
detection method for single-wall tanks, provided the system performs tests at least once per month and
meets performance standards
www.waterboards.ca.gov
.
Question 6: Who is authorized to perform cathodic protection (CP) testing on UST systems in
California?
,A. Any licensed plumber
B. The tank owner or operator
C. A NACE-certified engineer only
D. A qualified cathodic protection tester with appropriate training
CORRECT ANSWER: D. A qualified cathodic protection tester with appropriate training
RATIONALE: Cathodic protection systems must be tested by a qualified cathodic protection tester
within six months of installation and every 36 months thereafter, as specified in Title 23 CCR Section
2661
www.law.cornell.edu
.
Question 7: What is the minimum test pressure required when performing air pressure testing on UST
secondary containment if no manufacturer guidelines exist?
A. 1 psi
B. 2 psi
C. 3 psi
D. 5 psi
CORRECT ANSWER: C. 3 psi
RATIONALE: In the absence of manufacturer guidelines, California regulations require that primary and
secondary containment be tested for tightness using air pressure at not less than three pounds per
square inch (psi), per Title 23 CCR Section 2635(e)(2)
www.law.cornell.edu
.
Question 8: Within how many days must the results of enhanced leak detection testing be submitted
to the local agency and State Water Resources Control Board?
A. 15 days
B. 30 days
C. 45 days
D. 60 days
CORRECT ANSWER: D. 60 days
RATIONALE: California regulations require that results of enhanced leak detection (ELD) testing be
submitted to both the local agency and the State Water Resources Control Board within 60 days of test
completion
Quizlet
.
, Question 9: What is a key requirement for overfill prevention equipment installed on USTs in
California?
A. It must allow manual override during delivery
B. It must be inspected only during major repairs
C. It must prevent overfilling and not allow manual override
D. It is optional for tanks under 500 gallons
CORRECT ANSWER: C. It must prevent overfilling and not allow manual override
RATIONALE: California Health and Safety Code and Title 23 CCR require all USTs to be equipped with
overfill prevention equipment that does not permit manual override to ensure automatic shutoff and
prevent releases
www.sandiegocounty.gov
.
Question 10: Which document must a UST service technician complete after performing secondary
containment testing?
A. Monitoring System Certification Form
B. Spill Container Test Log
C. Secondary Containment Testing Report Form
D. Cathodic Protection Inspection Summary
CORRECT ANSWER: C. Secondary Containment Testing Report Form
RATIONALE: The technician must record test results on the official “Secondary Containment Testing
Report Form” and submit it to the local agency, as mandated by California regulations
www.unioncityca.gov
.
Question 11: What is the required frequency for cathodic protection system testing on USTs in
California?
A. Annually
B. Every 24 months
C. Every 36 months
D. Only at installation
CORRECT ANSWER: C. Every 36 months
RATIONALE: Cathodic protection systems must be tested within six months of installation and at least
once every 36 months thereafter, per Title 23 CCR Section 2661
www.law.cornell.edu
.
Certification Exam Study Guide 2025 |
Underground Storage Tank Inspection,
Maintenance, Compliance Regulations,
Safety Procedures, Practice Questions,
Verified Answers, and Exam Preparation
Materials for ICC Certification Success
Question 1: Which of the following best defines a California UST Service Technician according to state
regulations?
A. An individual who installs new underground storage tanks without oversight
B. A person responsible for daily facility operations and emergency response
C. Any individual who performs tank removals exclusively for decommissioned sites
D. Any individual who tests UST monitoring equipment, troubleshoots UST systems, and/or installs UST
monitoring equipment
CORRECT ANSWER: D. Any individual who tests UST monitoring equipment, troubleshoots UST
systems, and/or installs UST monitoring equipment
RATIONALE: According to California regulatory definitions and exam preparation materials, a UST
Service Technician is specifically defined as someone who tests, troubleshoots, or installs UST
monitoring equipment. This role is distinct from that of a Designated Operator and requires ICC
certification
Quizlet
.
Question 2: How often must an ICC California UST Service Technician renew their certification?
A. Every 12 months
B. Every 18 months
C. Every 24 months
D. Every 36 months
CORRECT ANSWER: C. Every 24 months
RATIONALE: California Code of Regulations Title 23, Section 2715(i) mandates that individuals holding
an ICC California UST Service Technician certification must renew it by passing the exam every 24
months to remain compliant
www.law.cornell.edu
.
Question 3: What is the primary purpose of secondary containment testing for UST systems in
California?
,A. To verify aesthetic integrity of the tank exterior
B. To confirm the system can contain a release from the primary tank
C. To assess soil composition around the tank
D. To measure fuel evaporation rates
CORRECT ANSWER: B. To confirm the system can contain a release from the primary tank
RATIONALE: Secondary containment systems are designed to capture leaks or spills from the primary
tank. Testing ensures the secondary barrier remains intact and functional, preventing environmental
contamination as required under Title 23 CCR Section 2637
www.waterboards.ca.gov
.
Question 4: According to California regulations, how frequently must spill containers (spill buckets) be
tested?
A. Every 6 months
B. Every 12 months
C. Every 24 months
D. Only after a spill occurs
CORRECT ANSWER: B. Every 12 months
RATIONALE: Spill containers must be tested upon installation, at least once every 12 calendar months
thereafter, and following any repair, per California Code of Regulations Title 23, Section 2637.1(a)
www.waterboards.ca.gov
.
Question 5: Which method is approved for leak detection in single-wall USTs in California?
A. Visual inspection only
B. Inventory reconciliation alone
C. Automatic tank gauging with monthly testing
D. Annual pressure testing without documentation
CORRECT ANSWER: C. Automatic tank gauging with monthly testing
RATIONALE: California regulations permit automatic tank gauging (ATG) as a quantitative release
detection method for single-wall tanks, provided the system performs tests at least once per month and
meets performance standards
www.waterboards.ca.gov
.
Question 6: Who is authorized to perform cathodic protection (CP) testing on UST systems in
California?
,A. Any licensed plumber
B. The tank owner or operator
C. A NACE-certified engineer only
D. A qualified cathodic protection tester with appropriate training
CORRECT ANSWER: D. A qualified cathodic protection tester with appropriate training
RATIONALE: Cathodic protection systems must be tested by a qualified cathodic protection tester
within six months of installation and every 36 months thereafter, as specified in Title 23 CCR Section
2661
www.law.cornell.edu
.
Question 7: What is the minimum test pressure required when performing air pressure testing on UST
secondary containment if no manufacturer guidelines exist?
A. 1 psi
B. 2 psi
C. 3 psi
D. 5 psi
CORRECT ANSWER: C. 3 psi
RATIONALE: In the absence of manufacturer guidelines, California regulations require that primary and
secondary containment be tested for tightness using air pressure at not less than three pounds per
square inch (psi), per Title 23 CCR Section 2635(e)(2)
www.law.cornell.edu
.
Question 8: Within how many days must the results of enhanced leak detection testing be submitted
to the local agency and State Water Resources Control Board?
A. 15 days
B. 30 days
C. 45 days
D. 60 days
CORRECT ANSWER: D. 60 days
RATIONALE: California regulations require that results of enhanced leak detection (ELD) testing be
submitted to both the local agency and the State Water Resources Control Board within 60 days of test
completion
Quizlet
.
, Question 9: What is a key requirement for overfill prevention equipment installed on USTs in
California?
A. It must allow manual override during delivery
B. It must be inspected only during major repairs
C. It must prevent overfilling and not allow manual override
D. It is optional for tanks under 500 gallons
CORRECT ANSWER: C. It must prevent overfilling and not allow manual override
RATIONALE: California Health and Safety Code and Title 23 CCR require all USTs to be equipped with
overfill prevention equipment that does not permit manual override to ensure automatic shutoff and
prevent releases
www.sandiegocounty.gov
.
Question 10: Which document must a UST service technician complete after performing secondary
containment testing?
A. Monitoring System Certification Form
B. Spill Container Test Log
C. Secondary Containment Testing Report Form
D. Cathodic Protection Inspection Summary
CORRECT ANSWER: C. Secondary Containment Testing Report Form
RATIONALE: The technician must record test results on the official “Secondary Containment Testing
Report Form” and submit it to the local agency, as mandated by California regulations
www.unioncityca.gov
.
Question 11: What is the required frequency for cathodic protection system testing on USTs in
California?
A. Annually
B. Every 24 months
C. Every 36 months
D. Only at installation
CORRECT ANSWER: C. Every 36 months
RATIONALE: Cathodic protection systems must be tested within six months of installation and at least
once every 36 months thereafter, per Title 23 CCR Section 2661
www.law.cornell.edu
.
