Water Main Replacement Prioritization Model

OWASA uses a Water Main Replacement Prioritization Model to systematically evaluate and prioritize water line rehabilitation and replacement investments and projects. Lines are replaced or rehabilitated when:

  • existing pipe conditions impair water quality;
  • there are serious risks to water service reliability;
  • the costs of repairing pipes and leaks have become excessive;
  • line breaks may result in major damage;
  • line capacity is no longer adequate to serve existing customers and/or new development; and
  • water main replacement is coincident with road improvement projects.

Using our Geographic Information System (GIS), we rank each water line segment according to break history, age, type of material, operating pressure, impact on customers, and other factors. This information is then used to identify the most critical water main rehabilitation and replacement projects in our water system.