Lead Pipes Have Nowhere Left to Hide

The EPA is defending its 10-year lead pipe replacement rule in court as utilities face a 2027 planning deadline and a potential $90 billion bill

26 Mar 2026

The E.P.A. filed a formal brief with the U.S. Court of Appeals for the D.C. Circuit in February, defending its mandate that water utilities nationwide replace all lead service lines within a decade. The filing signals that the agency intends to hold the Lead and Copper Rule Improvements, which took effect in December 2024, against a significant legal challenge from the water industry.

Under the rule, virtually all community water systems must complete removal of lead and galvanized service lines by 2037. The regulation also lowers the lead action level from 15 to 10 parts per billion, a threshold change that analysts said would trigger mandatory intervention for a broader range of utilities when tap testing reveals elevated readings. Baseline inventories and replacement plans must be submitted by November 2027, when annual replacement obligations also begin.

The legal challenge originates with the American Water Works Association, which argues the 10-year timeline is unworkable given workforce constraints and an industry-estimated replacement cost of roughly $90 billion. The E.P.A. countered with data from dozens of utilities it said demonstrate full replacement is achievable within the required window. The agency also defended its authority to require replacement of pipe segments on private property, arguing that utilities exercise sufficient operational control over entire service connections to bear the legal responsibility.

Environmental groups intervening in support of the rule pointed to the inadequacy of corrosion-control treatment as a long-term solution. Reliance on chemical additives, the E.P.A. concluded, had not reliably prevented contamination across aging distribution networks.

Roughly 4 million lead service lines remain in the ground across the country, and federal infrastructure funds and state revolving loan programs are available to help utilities finance replacement, though demand for those resources is substantial. A ruling from the D.C. Circuit is expected before the end of 2026. The outcome will determine whether the most sweeping overhaul of drinking water regulation in decades proceeds on schedule or faces a fundamental restructuring.