Water infrastructure management: Rehabilitation vs. replacement

Utilities managing aging water and wastewater infrastructure face critical decisions regarding whether to rehabilitate, expand, or replace existing facilities. Assessing whether a plant can meet current and future demands requires evaluating structural conditions, treatment performance, compliance history, and capacity against changing population growth and more stringent regulatory requirements.

For underground pipelines, trenchless rehabilitation methods are emerging as a significant alternative to traditional open-cut replacement. While conventional methods often see over 70% of construction costs spent on surface reinstatement rather than pipe installation, trenchless technologies like Cured-in-Place Pipe (CIPP) can reduce total project costs by 30% to 60%.

A study from the University of Texas at Arlington (2025) highlights the environmental benefits of trenchless methods, finding they result in a 56% lower overall environmental impact and a 71% lower global warming impact compared to traditional excavation. Techniques such as slip lining, which involves inserting a smaller-diameter pipe into an existing one, offer ways to extend pipeline service life by more than three decades.