Water Main Break Repair and Restoration SOP

Standard procedure for responding to a water main break, including isolation, safe excavation, repair, disinfection, flushing, and service restoration.

Steps

• Receive and log the break report
  The dispatcher or crew lead records the report in the incident log and captures the break location, time reported, water loss indicators, traffic impact, and any immediate hazards. The actor assigns an incident reference number and notifies the on-call response team.
• Dispatch the response crew and establish command
  The supervisor assigns a crew lead, a competent person for excavation safety, and any required support roles. The crew lead confirms the response route, staging area, and communication channel for field updates.
• Assess the site and control immediate hazards
  The crew lead inspects the area for flooding, sinkholes, energized utilities, traffic exposure, and unstable pavement. The actor establishes barricades and traffic control measures before any excavation begins.
• Isolate the broken main
  The operator identifies the nearest upstream and downstream isolation points and closes valves in a controlled sequence. The actor verifies pressure reduction at the break location and records any valves that do not fully seat or respond as expected.
• Confirm isolation and define the repair boundary
  The crew lead verifies that flow has stopped or is reduced to a safe level and confirms the exact repair limits. The actor documents any deviation, such as residual seepage or a valve that requires escalation.
• Set up the excavation permit and trench protection
  The competent person reviews the permit-to-work requirements, confirms utility locates, and selects the trench protection method based on soil and depth conditions. The actor verifies that spoil placement, access/egress, and exclusion zones are defined.
• Excavate to expose the damaged section
  The operator excavates carefully to expose the break and uses hand tools near the pipe and marked utilities. The actor stops work immediately if unmarked utilities, unstable soil, or unexpected water flow are encountered and escalates the deviation.
• Repair or replace the damaged pipe section
  The crew lead selects the approved repair method based on pipe material, break type, and available parts. The actor prepares the pipe ends, installs the repair component, and verifies alignment, torque, and seal integrity according to manufacturer instructions and utility standards.
• Disinfect the repaired section
  The water quality technician applies the required disinfection method to the repaired section and maintains the contact time specified by the utility procedure. The actor records the disinfectant concentration, contact time, and any non-conformance such as low residual or contamination concern.
• Flush and sample the line
  The operator flushes the repaired section until turbidity and debris are reduced to acceptable levels. The actor collects required samples and verifies residual chlorine and other acceptance criteria before service restoration continues.
• Restore service gradually
  The operator opens isolation valves slowly and monitors pressure, flow, and the repair site for leaks or abnormal noise. The actor stops restoration and escalates if pressure does not stabilize or if a new leak appears.
• Inspect the site and close the incident
  The crew lead verifies that the excavation is secured, temporary controls remain in place as needed, and the site is left in a safe condition. The actor records the repair details, materials used, test results, restoration time, and any deviations or follow-up actions required under ISO 9001 documented information controls.