9.2 million lead water service lines exist but cities can't find them

The EPA's 2024 Lead and Copper Rule Improvements require all U.S. water systems to inventory and replace lead service lines within 10 years. The problem: most water utilities have no idea which of their service lines are lead. Service line material was not consistently recorded before the 1980s, and records that do exist are often paper cards in filing cabinets, not digital databases. An estimated 9.2 million service lines are made of 'unknown' material nationwide. To determine if a line is lead, someone must physically inspect it — either by excavating at the curb stop ($500-2,000 per address) or by having a homeowner scrape the pipe where it enters the basement (which requires homeowner cooperation and correct identification of lead vs. galvanized steel). Many homeowners don't respond to mailers, don't have accessible pipes, or misidentify the material. Cities like Pittsburgh, Newark, and Chicago have replaced thousands of lines but faced massive delays because the inventory phase alone — figuring out which lines are lead — took years and cost millions. The average replacement cost is $4,700 per line (EPA estimate), meaning full national replacement could exceed $45 billion. The structural problem: for over a century, nobody tracked what material was used for each service connection, and now the entire country must retroactively survey millions of buried connections one address at a time.