NORTH CAROLINA (NC) (PU) WATER LINES AND SEWER LINES
PRACTICE TEST EXAM QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES 2026 Q&A | LATEST EXAM
UPDATE 2026/2027
Core Domains:
1. Scope of Work and License Limitations for NC (PU) Water Lines & Sewer Lines Contractors
2. Regulatory Framework: NC Licensing Board for General Contractors, NCDEQ, and NCDOT Compliance
3. Water Distribution Systems: Mains, Service Lines, Valves, Hydrants, and Meters
4. Sanitary Sewer Collection Systems: Gravity Mains, Force Mains, Lift Stations, and Manholes
5. Pipe Materials, Joints, Bedding, Backfill, and Trenchless Technology
6. Hydraulics, Pressure Testing, Disinfection, and Flow Measurement
7. Excavation Safety, OSHA Standards, and Confined Space Entry
8. Erosion Control, Environmental Compliance, and Utility Locating
9. System Operations: Pumps, SCADA, and Infrastructure Maintenance
Introduction
,This comprehensive practice examination is designed to assess the knowledge and skills required for professionals
holding or seeking a North Carolina Public Utilities (PU) Water Lines and Sewer Lines license. The exam covers
foundational theory, applied professional knowledge, regulatory compliance, ethics, and real-world decision-
making. Questions are structured in a multiple-choice format, including scenario-based problems that emphasize
practical application and critical thinking in the field. Candidates will be evaluated on their understanding of
installation techniques, safety protocols, system hydraulics, and the legal framework governing public utility work
in North Carolina. Success on this exam reflects a candidate's readiness to perform work safely, competently, and
in accordance with all applicable codes and standards.
SECTION ONE: QUESTIONS 1–100
1. Which of the following best describes the primary scope of work authorized under a North Carolina Public
Utilities (PU) Water Lines & Sewer Lines license?
A. Construction, installation, and repair of water lines and sewer lines on private residential property only
B. Construction of wastewater treatment facilities and related process piping
C. Construction, installation, alteration, maintenance, or repair of water and sewer mains, service lines, storage
tanks, lift stations, and pumping stations
D. Installation of electrical and HVAC systems for utility infrastructure buildings
🟢C
🔴 RATIONALE: The NC (PU) Water Lines & Sewer Lines license specifically authorizes work on public utility
infrastructure, including water and sewer mains, service lines, storage tanks, lift stations, and pumping stations.
,It does not authorize construction of wastewater treatment plants, which require specialized licensure, nor does
it permit unrelated trades such as electrical or HVAC work .
2. Which of the following is a key limitation of the NC (PU) Water Lines & Sewer Lines license?
A. It allows construction of complete septic systems for single-family residences
B. It includes authority to lay and construct natural gas pipelines
C. It does not include work on building plumbing systems beyond five feet of the building
D. It permits general building construction activities, including framing and roofing
🟢C
🔴 RATIONALE: The "five-foot rule" is a critical boundary: plumbing work within five feet of a building structure
is typically considered building plumbing and may require a plumbing license. Work beyond this point,
involving the utility infrastructure, falls under the scope of the (PU) license .
3. Under the NC (PU) Water Lines & Sewer Lines classification, which of the following ancillary activities is
permitted?
A. Installation of telecommunication cables
B. Erection of large commercial buildings
C. Pavement patching and backfill related to water/sewer line trenching
D. Roofing repairs for pump station buildings
, 🟢C
🔴 RATIONALE: Activities directly connected to water and sewer line work, such as pavement patching, trench
backfilling, and implementing erosion control measures, are permitted as ancillary activities. This license does
not cover unrelated trades or general construction activities .
4. A contractor holding an NC (PU) Water Lines & Sewer Lines license is allowed to work on which of the
following?
A. Private plumbing inside residential bathrooms
B. Construction of water system storage tanks
C. Electrical wiring within a treatment plant
D. Designing water treatment processes
🟢B
🔴 RATIONALE: Storage tanks are integral components of water distribution infrastructure and are included
within the scope of work for the (PU) license. The license does not authorize interior plumbing, electrical work,
or process design, which require other qualifications .
5. The primary regulatory body overseeing the NC (PU) Water Lines & Sewer Lines license is:
PRACTICE TEST EXAM QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES 2026 Q&A | LATEST EXAM
UPDATE 2026/2027
Core Domains:
1. Scope of Work and License Limitations for NC (PU) Water Lines & Sewer Lines Contractors
2. Regulatory Framework: NC Licensing Board for General Contractors, NCDEQ, and NCDOT Compliance
3. Water Distribution Systems: Mains, Service Lines, Valves, Hydrants, and Meters
4. Sanitary Sewer Collection Systems: Gravity Mains, Force Mains, Lift Stations, and Manholes
5. Pipe Materials, Joints, Bedding, Backfill, and Trenchless Technology
6. Hydraulics, Pressure Testing, Disinfection, and Flow Measurement
7. Excavation Safety, OSHA Standards, and Confined Space Entry
8. Erosion Control, Environmental Compliance, and Utility Locating
9. System Operations: Pumps, SCADA, and Infrastructure Maintenance
Introduction
,This comprehensive practice examination is designed to assess the knowledge and skills required for professionals
holding or seeking a North Carolina Public Utilities (PU) Water Lines and Sewer Lines license. The exam covers
foundational theory, applied professional knowledge, regulatory compliance, ethics, and real-world decision-
making. Questions are structured in a multiple-choice format, including scenario-based problems that emphasize
practical application and critical thinking in the field. Candidates will be evaluated on their understanding of
installation techniques, safety protocols, system hydraulics, and the legal framework governing public utility work
in North Carolina. Success on this exam reflects a candidate's readiness to perform work safely, competently, and
in accordance with all applicable codes and standards.
SECTION ONE: QUESTIONS 1–100
1. Which of the following best describes the primary scope of work authorized under a North Carolina Public
Utilities (PU) Water Lines & Sewer Lines license?
A. Construction, installation, and repair of water lines and sewer lines on private residential property only
B. Construction of wastewater treatment facilities and related process piping
C. Construction, installation, alteration, maintenance, or repair of water and sewer mains, service lines, storage
tanks, lift stations, and pumping stations
D. Installation of electrical and HVAC systems for utility infrastructure buildings
🟢C
🔴 RATIONALE: The NC (PU) Water Lines & Sewer Lines license specifically authorizes work on public utility
infrastructure, including water and sewer mains, service lines, storage tanks, lift stations, and pumping stations.
,It does not authorize construction of wastewater treatment plants, which require specialized licensure, nor does
it permit unrelated trades such as electrical or HVAC work .
2. Which of the following is a key limitation of the NC (PU) Water Lines & Sewer Lines license?
A. It allows construction of complete septic systems for single-family residences
B. It includes authority to lay and construct natural gas pipelines
C. It does not include work on building plumbing systems beyond five feet of the building
D. It permits general building construction activities, including framing and roofing
🟢C
🔴 RATIONALE: The "five-foot rule" is a critical boundary: plumbing work within five feet of a building structure
is typically considered building plumbing and may require a plumbing license. Work beyond this point,
involving the utility infrastructure, falls under the scope of the (PU) license .
3. Under the NC (PU) Water Lines & Sewer Lines classification, which of the following ancillary activities is
permitted?
A. Installation of telecommunication cables
B. Erection of large commercial buildings
C. Pavement patching and backfill related to water/sewer line trenching
D. Roofing repairs for pump station buildings
, 🟢C
🔴 RATIONALE: Activities directly connected to water and sewer line work, such as pavement patching, trench
backfilling, and implementing erosion control measures, are permitted as ancillary activities. This license does
not cover unrelated trades or general construction activities .
4. A contractor holding an NC (PU) Water Lines & Sewer Lines license is allowed to work on which of the
following?
A. Private plumbing inside residential bathrooms
B. Construction of water system storage tanks
C. Electrical wiring within a treatment plant
D. Designing water treatment processes
🟢B
🔴 RATIONALE: Storage tanks are integral components of water distribution infrastructure and are included
within the scope of work for the (PU) license. The license does not authorize interior plumbing, electrical work,
or process design, which require other qualifications .
5. The primary regulatory body overseeing the NC (PU) Water Lines & Sewer Lines license is:
