A company hired for $10 million to replace lead pipes in Newark lied about getting the work done, federal prosecutors say.

A company hired to replace 18,000 dangerous lead water pipes in Newark billed the city for $10.2 million while using misleading photographs, federal authorities announced Thursday. The CEO of JAS Group Enterprise and a company foreperson have each been charged with conspiracy to commit wire fraud.

The Lead Service Line Replacement Program in Newark, touted as a major success and a blueprint for other U.S. cities, was tainted Thursday after federal prosecutors alleged that one of the contractors hired to replace lead pipes didn’t fully finish the job.