IDAHO PLUMBING SPECIALTY JOURNEYMAN EXAMINATION
UPDATED QUESTIONS AND ANSWERS WITH RATIONALE
A+ GRADED| BRAND NEW RELEASE!
This comprehensive examination is designed for individuals seeking certification as a
Plumbing Specialty Journeyman in the state of Idaho. The test rigorously assesses a
candidate's knowledge of plumbing systems, installation practices, code compliance,
and safety protocols. The examination is based on the 2015 Uniform Plumbing Code
(UPC) and the 2017 Idaho State Plumbing Code (ISPC) as specified by the Idaho
Division of Occupational and Professional Licenses (DOPL). Successful completion
demonstrates the candidate's readiness to perform plumbing work in compliance with
state regulations, ensuring public health, safety, and sanitation.
EXAM DOMAINS (SUBJECT AREAS):
1. Idaho State Plumbing Code & Regulations (ISPC, Permits, Inspections)
2. Definitions & Terminology (Fixtures, Fittings, Piping)
3. Drainage Systems (Fixtures, Traps, Piping, Cleanouts)
4. Venting Systems (Purpose, Types, Sizing)
5. Water Supply Systems (Distribution, Sizing, Cross-Connection)
6. Fixtures & Appliances (Installation, Clearances, Requirements)
7. Isometric Drawing & Blueprint Reading
8. Safety & OSHA Regulations
9. Math & Hydraulics (Friction Loss, Pressure, Sizing)
10. Gas Piping Systems (Materials, Installation, Venting)
1. Which situation generally requires a plumbing permit before regulated
plumbing work begins on a building project in Idaho?
A. Replacing a faucet aerator
B. Installing or altering regulated plumbing systems
C. Cleaning a kitchen sink trap
D. Replacing a toilet seat
, Answer: B
Rationale: A plumbing permit provides regulatory oversight for new installations,
alterations, and other work governed by Idaho plumbing requirements.
2. Why is obtaining the required plumbing permit important before beginning
regulated plumbing installation or alteration work?
A. It eliminates inspection requirements
B. It establishes regulatory authorization and permits required inspections
C. It guarantees the installation will pass
D. It replaces the contractor's license
Answer: B
Rationale: Permitting establishes authorization for regulated work and allows the
jurisdiction to verify compliance through required inspections.
3. During an inspection, an inspector discovers concealed piping that cannot be
adequately evaluated without additional access. What should occur?
A. The inspector must approve it automatically
B. The piping may need to be exposed for inspection
C. The contractor should remove the entire system
D. The owner may waive inspection
Answer: B
Rationale: Concealed work must remain accessible when necessary so inspectors
can verify installation, materials, connections, and code compliance.
4. Which reference combination is specifically identified for the Idaho Plumbing
Journeyman examination according to the current candidate bulletin?
, A. 2018 IRC and 2021 IPC
B. 2015 UPC and 2017 Idaho State Plumbing Code
C. 2021 UPC and 2024 ISPC
D. NFPA 70 and NEC only
Answer: B
Rationale: Idaho's current examination bulletin identifies the 2015 Uniform
Plumbing Code and 2017 Idaho State Plumbing Code as permitted references.
(dopl.idaho.gov)
5. What is the principal purpose of plumbing-code administration and inspection
requirements on regulated construction projects?
A. Increase material costs
B. Establish minimum safety and sanitation requirements
C. Prevent all plumbing modifications
D. Eliminate engineering responsibilities
Answer: B
Rationale: Plumbing regulations establish minimum requirements intended to
protect public health, safety, sanitation, and property.
6. In plumbing terminology, what is the primary distinction between a fixture drain
and a fixture supply pipe?
A. One carries wastewater while the other delivers water
B. Both carry potable water
C. Both carry sewage away from buildings
D. One carries gas while the other carries water
, Answer: A
Rationale: A fixture supply delivers water to a plumbing fixture, while the fixture
drain carries discharged wastewater away.
7. What is the primary function of a trap installed beneath a plumbing fixture?
A. Increase water pressure
B. Prevent sewer gases from entering occupied spaces
C. Increase drainage velocity
D. Remove suspended solids
Answer: B
Rationale: The trap maintains a water seal that separates the drainage system
from potentially harmful or objectionable sewer gases.
8. Which term describes the piping that carries wastewater from plumbing fixtures
toward the building sewer?
A. Water distribution pipe
B. Drainage piping
C. Supply riser
D. Gas vent
Answer: B
Rationale: Drainage piping conveys wastewater and sewage from fixtures
through the building drainage system toward the sewer connection.
9. What is the principal purpose of a venting system within a plumbing drainage
installation?
UPDATED QUESTIONS AND ANSWERS WITH RATIONALE
A+ GRADED| BRAND NEW RELEASE!
This comprehensive examination is designed for individuals seeking certification as a
Plumbing Specialty Journeyman in the state of Idaho. The test rigorously assesses a
candidate's knowledge of plumbing systems, installation practices, code compliance,
and safety protocols. The examination is based on the 2015 Uniform Plumbing Code
(UPC) and the 2017 Idaho State Plumbing Code (ISPC) as specified by the Idaho
Division of Occupational and Professional Licenses (DOPL). Successful completion
demonstrates the candidate's readiness to perform plumbing work in compliance with
state regulations, ensuring public health, safety, and sanitation.
EXAM DOMAINS (SUBJECT AREAS):
1. Idaho State Plumbing Code & Regulations (ISPC, Permits, Inspections)
2. Definitions & Terminology (Fixtures, Fittings, Piping)
3. Drainage Systems (Fixtures, Traps, Piping, Cleanouts)
4. Venting Systems (Purpose, Types, Sizing)
5. Water Supply Systems (Distribution, Sizing, Cross-Connection)
6. Fixtures & Appliances (Installation, Clearances, Requirements)
7. Isometric Drawing & Blueprint Reading
8. Safety & OSHA Regulations
9. Math & Hydraulics (Friction Loss, Pressure, Sizing)
10. Gas Piping Systems (Materials, Installation, Venting)
1. Which situation generally requires a plumbing permit before regulated
plumbing work begins on a building project in Idaho?
A. Replacing a faucet aerator
B. Installing or altering regulated plumbing systems
C. Cleaning a kitchen sink trap
D. Replacing a toilet seat
, Answer: B
Rationale: A plumbing permit provides regulatory oversight for new installations,
alterations, and other work governed by Idaho plumbing requirements.
2. Why is obtaining the required plumbing permit important before beginning
regulated plumbing installation or alteration work?
A. It eliminates inspection requirements
B. It establishes regulatory authorization and permits required inspections
C. It guarantees the installation will pass
D. It replaces the contractor's license
Answer: B
Rationale: Permitting establishes authorization for regulated work and allows the
jurisdiction to verify compliance through required inspections.
3. During an inspection, an inspector discovers concealed piping that cannot be
adequately evaluated without additional access. What should occur?
A. The inspector must approve it automatically
B. The piping may need to be exposed for inspection
C. The contractor should remove the entire system
D. The owner may waive inspection
Answer: B
Rationale: Concealed work must remain accessible when necessary so inspectors
can verify installation, materials, connections, and code compliance.
4. Which reference combination is specifically identified for the Idaho Plumbing
Journeyman examination according to the current candidate bulletin?
, A. 2018 IRC and 2021 IPC
B. 2015 UPC and 2017 Idaho State Plumbing Code
C. 2021 UPC and 2024 ISPC
D. NFPA 70 and NEC only
Answer: B
Rationale: Idaho's current examination bulletin identifies the 2015 Uniform
Plumbing Code and 2017 Idaho State Plumbing Code as permitted references.
(dopl.idaho.gov)
5. What is the principal purpose of plumbing-code administration and inspection
requirements on regulated construction projects?
A. Increase material costs
B. Establish minimum safety and sanitation requirements
C. Prevent all plumbing modifications
D. Eliminate engineering responsibilities
Answer: B
Rationale: Plumbing regulations establish minimum requirements intended to
protect public health, safety, sanitation, and property.
6. In plumbing terminology, what is the primary distinction between a fixture drain
and a fixture supply pipe?
A. One carries wastewater while the other delivers water
B. Both carry potable water
C. Both carry sewage away from buildings
D. One carries gas while the other carries water
, Answer: A
Rationale: A fixture supply delivers water to a plumbing fixture, while the fixture
drain carries discharged wastewater away.
7. What is the primary function of a trap installed beneath a plumbing fixture?
A. Increase water pressure
B. Prevent sewer gases from entering occupied spaces
C. Increase drainage velocity
D. Remove suspended solids
Answer: B
Rationale: The trap maintains a water seal that separates the drainage system
from potentially harmful or objectionable sewer gases.
8. Which term describes the piping that carries wastewater from plumbing fixtures
toward the building sewer?
A. Water distribution pipe
B. Drainage piping
C. Supply riser
D. Gas vent
Answer: B
Rationale: Drainage piping conveys wastewater and sewage from fixtures
through the building drainage system toward the sewer connection.
9. What is the principal purpose of a venting system within a plumbing drainage
installation?
