NORTH CAROLINA WATER DISTRIBUTION C EXAM QUESTIONS
WITH CORRECT ANSWERS 2025/2026
Maximum contaminant level (MCL) - CORRECT ANSWER -maximum permissible level of a
contaminant in water as specified in the regulations of the Safe Drinking Water Act
Public Water System - CORRECT ANSWER -delivers water to customers (residential, commercial,
industrial, fire protection)
Must be free of cross-connections with unapproved water sources and other potential sources
of contamination
Parts of Public Water Distribution System - CORRECT ANSWER -network of pipes, valves,
hydrants, service lines, meters, pump stations, storage tanks
Transmission Mains - CORRECT ANSWER -transport large volumes of water across the system
Distribution Pipes - CORRECT ANSWER -carry water, smaller than transmission mains, PVC, DIP,
Concrete, etc.
Safe Drinking Water Act - CORRECT ANSWER -provides uniform national standards
NCDEQ-Division of Water Resources - CORRECT ANSWER -North Carolina Division of
Environmental Quality, water supply use reporting, drought and conservation
Cross-Connection - CORRECT ANSWER -any arrangement of pipes, fittings, fixtures, or devices
that connects a nonpotable system to a potable water system
Disinfection - CORRECT ANSWER -water treatment process that kills disease-causing organisms
in water, usually by the addition of chlorine
WITH CORRECT ANSWERS 2025/2026
Maximum contaminant level (MCL) - CORRECT ANSWER -maximum permissible level of a
contaminant in water as specified in the regulations of the Safe Drinking Water Act
Public Water System - CORRECT ANSWER -delivers water to customers (residential, commercial,
industrial, fire protection)
Must be free of cross-connections with unapproved water sources and other potential sources
of contamination
Parts of Public Water Distribution System - CORRECT ANSWER -network of pipes, valves,
hydrants, service lines, meters, pump stations, storage tanks
Transmission Mains - CORRECT ANSWER -transport large volumes of water across the system
Distribution Pipes - CORRECT ANSWER -carry water, smaller than transmission mains, PVC, DIP,
Concrete, etc.
Safe Drinking Water Act - CORRECT ANSWER -provides uniform national standards
NCDEQ-Division of Water Resources - CORRECT ANSWER -North Carolina Division of
Environmental Quality, water supply use reporting, drought and conservation
Cross-Connection - CORRECT ANSWER -any arrangement of pipes, fittings, fixtures, or devices
that connects a nonpotable system to a potable water system
Disinfection - CORRECT ANSWER -water treatment process that kills disease-causing organisms
in water, usually by the addition of chlorine
