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Relining Pipes

As part of ongoing efforts to provide a reliable, high-quality water supply, Denver Water identifies sections of pipeline to recondition each summer. In 2014, pipe rehabilitation work improved a total of 39,000 feet of pipeline in four Denver neighborhoods.

Like many other utilities, Denver Water used to install pipelines made of cast iron. Over time, cast iron can corrode and may lead to water discoloration, decreased pressure and increased susceptibility to leaks or main breaks.

Despite these issues, cast iron is very sturdy and — with proper maintenance and improvements — can provide reliable service for decades to come.

The routine annual project involves cleaning the insides of pipelines and applying a new lining as a cost-effective, minimally invasive alternative to pipe replacement. The new lining protects pipes against future interior corrosion and creates a barrier against leakage, adding many more years to pipes’ ability to provide high-quality water supplies and adequate flows for fire protection.

Because water cannot be running in pipes during cleaning and relining, crews temporarily reroute — or bypass — water to customers by setting up above-ground water supply systems of hoses and piping along streets and sidewalks. These work areas may include traffic lane and street parking closures as well as metal covers on temporary street openings.

We understand the inconveniences maintenance projects can bring to neighborhoods and businesses. To help minimize traffic disruptions, Denver Water works closely with local permitting and traffic authorities as well as elected officials’ offices and associations representing businesses and homeowners.

If you have questions about the pipe rehabilitation project, please contact Dana Strongin, Denver Water Public Affairs, at dana.strongin@denverwater.org or 303-607-3132.