For plumbers in Flint, Mich., “it’s been a heck of a year,” said Harold T. Harrington, a master plumber and pipefitter working as the business manager for Flint’s United Association of Plumbers and Pipefitters, Local 370.

Three years after Flint’s water crisis was first reported and a little more than a year after state officials acknowledged the lead problems, many residents still rely on bottled water. Even those with new service lines, taps, filters, and water heaters don’t fully trust what pours out of their home faucets.