NASSCO Lateral Assessment Certification
Program (LACP) Practice Exam Questions
And Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A | Instant
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1. Which of the following best describes a lateral sewer?
a) A mainline sewer connecting multiple neighborhoods
b) A pipe connecting a single property to the mainline sewer
c) A stormwater runoff channel
d) A combined sewer overflow
b) A pipe connecting a single property to the mainline sewer
Rationale: A lateral sewer is the segment of pipe that connects an
individual property or building to the mainline sewer.
2. What is the primary purpose of a lateral inspection?
a) To monitor water quality
, b) To identify structural defects or blockages
c) To calculate flow rates
d) To assess municipal compliance
b) To identify structural defects or blockages
Rationale: Lateral inspections are performed to locate cracks, offsets,
collapses, and obstructions.
3. Which method is most commonly used for lateral inspection?
a) Air testing
b) Closed-Circuit Television (CCTV) inspection
c) Smoke testing
d) Dye testing
b) Closed-Circuit Television (CCTV) inspection
Rationale: CCTV inspection is the standard method for evaluating lateral
condition because it allows visual assessment of defects.
4. Which lateral defect is indicated by a misalignment or step between
pipe sections?
a) Root intrusion
b) Offset
c) Joint infiltration
d) Sagging
,b) Offset
Rationale: An offset occurs when two pipe sections are misaligned,
creating a step that can obstruct flow.
5. What is the primary cause of lateral sagging?
a) Soil movement and settlement
b) Grease buildup
c) Pipe material corrosion
d) Improper installation depth
a) Soil movement and settlement
Rationale: Sagging usually occurs due to ground settlement or improper
bedding, creating low points where debris can accumulate.
6. Which of the following is a common sign of root intrusion in a lateral?
a) Water discoloration
b) Dark stains on the pipe
c) Visible roots obstructing the pipe
d) High flow velocity
c) Visible roots obstructing the pipe
Rationale: Roots enter lateral pipes at joints or cracks, causing blockages
and damage.
7. How are lateral defects typically classified in NASSCO LACP standards?
a) Minor, moderate, severe
b) Class 1–4
, c) Structural or O&M (Operation & Maintenance) related
d) Type A, B, C
c) Structural or O&M (Operation & Maintenance) related
Rationale: LACP classifies defects as either structural (affecting integrity)
or O&M-related (affecting flow or maintenance).
8. Which pipe material is most susceptible to cracking from soil
movement?
a) PVC
b) Ductile iron
c) Concrete
d) Clay
d) Clay
Rationale: Clay pipes are brittle and prone to cracking under soil
movement or settlement.
9. Which defect occurs when the lateral pipe dips below the intended
slope?
a) Offset
b) Sagging
c) Joint infiltration
d) Misalignment
Program (LACP) Practice Exam Questions
And Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A | Instant
Download Pdf
1. Which of the following best describes a lateral sewer?
a) A mainline sewer connecting multiple neighborhoods
b) A pipe connecting a single property to the mainline sewer
c) A stormwater runoff channel
d) A combined sewer overflow
b) A pipe connecting a single property to the mainline sewer
Rationale: A lateral sewer is the segment of pipe that connects an
individual property or building to the mainline sewer.
2. What is the primary purpose of a lateral inspection?
a) To monitor water quality
, b) To identify structural defects or blockages
c) To calculate flow rates
d) To assess municipal compliance
b) To identify structural defects or blockages
Rationale: Lateral inspections are performed to locate cracks, offsets,
collapses, and obstructions.
3. Which method is most commonly used for lateral inspection?
a) Air testing
b) Closed-Circuit Television (CCTV) inspection
c) Smoke testing
d) Dye testing
b) Closed-Circuit Television (CCTV) inspection
Rationale: CCTV inspection is the standard method for evaluating lateral
condition because it allows visual assessment of defects.
4. Which lateral defect is indicated by a misalignment or step between
pipe sections?
a) Root intrusion
b) Offset
c) Joint infiltration
d) Sagging
,b) Offset
Rationale: An offset occurs when two pipe sections are misaligned,
creating a step that can obstruct flow.
5. What is the primary cause of lateral sagging?
a) Soil movement and settlement
b) Grease buildup
c) Pipe material corrosion
d) Improper installation depth
a) Soil movement and settlement
Rationale: Sagging usually occurs due to ground settlement or improper
bedding, creating low points where debris can accumulate.
6. Which of the following is a common sign of root intrusion in a lateral?
a) Water discoloration
b) Dark stains on the pipe
c) Visible roots obstructing the pipe
d) High flow velocity
c) Visible roots obstructing the pipe
Rationale: Roots enter lateral pipes at joints or cracks, causing blockages
and damage.
7. How are lateral defects typically classified in NASSCO LACP standards?
a) Minor, moderate, severe
b) Class 1–4
, c) Structural or O&M (Operation & Maintenance) related
d) Type A, B, C
c) Structural or O&M (Operation & Maintenance) related
Rationale: LACP classifies defects as either structural (affecting integrity)
or O&M-related (affecting flow or maintenance).
8. Which pipe material is most susceptible to cracking from soil
movement?
a) PVC
b) Ductile iron
c) Concrete
d) Clay
d) Clay
Rationale: Clay pipes are brittle and prone to cracking under soil
movement or settlement.
9. Which defect occurs when the lateral pipe dips below the intended
slope?
a) Offset
b) Sagging
c) Joint infiltration
d) Misalignment
