ST. LOUIS (AP) — The Environmental Protection Agency distributed about $3 billion to states last year to replace harmful lead pipes based on unverified data, according to an agency inspector general’s memo, likely meaning some states got too much money and others got too little.

Investigators found two states had submitted inaccurate data, the memo released Wednesday said. It didn’t name the states. The EPA has since made changes, but the inspector general said the agency could do more.

“Insufficient internal controls for verifying data led to allotments that did not represent the needs of each state, and if left unaddressed, the Agency runs the risk of using unreliable data for future” infrastructure spending, said EPA Inspector General Sean W. O’Donnell.

The agency has said it will release new information on lead service lines projections later this summer. The EPA did not respond to a request for comment Thursday.