Water Distribution System Audit Checklist [FREE PDF]

Water distribution system audits are mandated under the EPA Safe Drinking Water Act (SDWA) to ensure continuous delivery of safe, potable water to consumers. Utilities must comply with 40 CFR Part 141 (National Primary Drinking Water Regulations) and maintain detailed records of system integrity, pressure zones, and disinfection residuals. Regular audits help identify vulnerabilities, reduce non-revenue water loss, and demonstrate regulatory compliance to state primacy agencies.

  • Industry: Water Utilities
  • Frequency: Quarterly
  • Estimated Time: 60-90 minutes
  • Role: Utility Inspector
  • Total Items: 35
  • Compliance: EPA SDWA 40 CFR Part 141, EPA SDWA 40 CFR Part 143, OSHA 29 CFR 1910.146 (Confined Space Entry), OSHA 29 CFR 1910.269 (Electric Power Generation), AWWA M36 Water Audits and Loss Control

System Records and Documentation

Verify that all required regulatory records, permits, and system maps are current and accessible.

  • Are current as-built distribution system maps available and up to date?
  • Is the current state operating permit on file and within its valid period?
  • Are consumer confidence reports (CCR) filed and distributed within the required annual deadline?
  • Are monitoring and reporting records retained for the minimum required period?
  • Are cross-connection control program records current and accessible?

Water Quality and Disinfection Monitoring

Assess disinfectant residuals, microbial sampling, and compliance with primary drinking water standards.

  • Is free chlorine residual at distribution endpoints meeting the minimum 0.2 mg/L requirement?
  • What is the current measured free chlorine residual at the system's most distant endpoint (mg/L)?
  • Are total coliform sampling sites representative of the distribution system and meeting monthly quotas?
  • Have any positive total coliform results triggered the required Level 1 or Level 2 assessments?
  • Are lead and copper monitoring results within the action level thresholds (Pb <15 ppb, Cu <1.3 ppm)?
  • Are turbidity measurements at entry points within the required limits?

Pressure and System Integrity

Evaluate system pressure zones, pipe integrity, and leak detection practices.

  • Is system pressure maintained at a minimum of 20 psi at all service connections during normal operations?
  • What is the current lowest recorded system pressure in the past 30 days (psi)?
  • Has the system conducted a water audit using AWWA water loss methodology in the past 12 months?
  • Are pressure relief valves and pressure reducing valves (PRVs) tested and within calibration?
  • Are known leaks or main breaks tracked in a maintenance management system with repair timelines?

Storage Facilities Inspection

Inspect water storage tanks and reservoirs for structural integrity, security, and water quality maintenance.

  • Are all storage tanks inspected internally at a frequency meeting AWWA D100 or state requirements?
  • Are storage facility access hatches secured with tamper-resistant locks?
  • Are tank overflow and vent screens intact and free from damage or debris?
  • Is the disinfectant residual within storage tanks tested at the required monitoring frequency?
  • Are storage tank water levels monitored remotely via SCADA or telemetry?

Cross-Connection Control and Backflow Prevention

Verify backflow prevention devices are installed, tested, and recorded at all required locations.

  • Are all high-hazard service connections equipped with approved backflow prevention assemblies?
  • Have all required backflow prevention assemblies been tested by a certified tester within the past 12 months?
  • Are failed or non-compliant backflow devices documented and scheduled for repair or replacement?
  • Is a complete cross-connection survey of the service area conducted per program requirements?

Security and Emergency Response Preparedness

Evaluate physical security measures, cybersecurity of SCADA systems, and emergency response plan status.

  • Has the system completed a current Risk and Resilience Assessment (RRA) per AWIA 2018 requirements?
  • Is an updated Emergency Response Plan (ERP) in place and certified to EPA within 6 months of RRA completion?
  • Are SCADA and control system networks protected by cybersecurity controls and access restrictions?
  • Are emergency contact lists for state regulators, public health officials, and media current and accessible?
  • Has an emergency response drill or tabletop exercise been conducted within the past 12 months?

Operator Certification and Worker Safety

Confirm operator certifications are current and field safety protocols meet OSHA requirements.

  • Does the system have a certified operator of the required classification on staff or under contract?
  • Are confined space entry permits and procedures in place for work in vaults, manholes, and storage tanks?
  • Is personal protective equipment (PPE) appropriate for chemical handling available and in use?
  • Are Safety Data Sheets (SDS) current and accessible for all chemicals used in the distribution system?
  • Are chlorine and chemical storage areas equipped with eyewash stations and emergency showers?

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Why Use This Water Distribution System Audit Checklist [FREE PDF]?

This water distribution system audit checklist [free pdf] helps water utilities teams maintain compliance and operational excellence. Designed for utility inspector professionals, this checklist covers 35 critical inspection points across 7 sections. Recommended frequency: quarterly.

Ensures compliance with EPA SDWA 40 CFR Part 141, EPA SDWA 40 CFR Part 143, OSHA 29 CFR 1910.146 (Confined Space Entry), OSHA 29 CFR 1910.269 (Electric Power Generation), AWWA M36 Water Audits and Loss Control. Regulatory-aligned for audit readiness and inspection documentation.

Frequently Asked Questions

What does the Water Distribution System Audit Checklist [FREE PDF] cover?

This checklist covers 35 inspection items across 7 sections: System Records and Documentation, Water Quality and Disinfection Monitoring, Pressure and System Integrity, Storage Facilities Inspection, Cross-Connection Control and Backflow Prevention, Security and Emergency Response Preparedness, Operator Certification and Worker Safety. It is designed for water utilities operations and compliance.

How often should this checklist be completed?

This checklist should be completed quarterly. Each completion takes approximately 60-90 minutes.

Who should use this Water Distribution System Audit Checklist [FREE PDF]?

This checklist is designed for Utility Inspector professionals in the water utilities industry. It can be used for self-assessments, team audits, and regulatory compliance documentation.

Can I download this checklist as a PDF?

Yes, this checklist is available as a free PDF download. You can also use it digitally in the POPProbe mobile app for real-time data capture, photo documentation, and automatic reporting.

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