Chicago faces steep expenses replacing its extensive network of lead water pipes compared to other cities. With more than 400,000 lead service lines, the city reports an average replacement cost of $31,000 per line. This figure exceeds the national average and raises questions about efficiency under a federal mandate.
The city holds the largest known inventory of lead pipes in the United States. Officials estimate full replacement at current rates will exceed $12 billion over roughly 20 years. Other major cities report averages between $6,000 and $25,000 per line, with most below half of Chicago’s cost.
Several factors contribute to the elevated prices. These include early inefficient contracts, cumbersome permitting processes, and a reliance on one-off replacements rather than block-wide projects. Block-level work accounted for only 3 percent of the approximately 15,000 lines replaced from 2021 through the end of 2025.
A new state bill passed in May would allow city plumbers to access private lines without owner permission. It now awaits Governor J.B. Pritzker’s signature. A separate $22 million federal grant announced this month targets the Austin neighborhood but covers only about 650 lines at current costs.
Water department officials acknowledge room for improvement but dispute claims that the costs are unreasonable. Experts and advocates, including Cyndi Roper of the Natural Resources Defense Council, call for greater transparency and process changes.