The U.S. Attorney's Office in Los Angeles presented
with a grand jury subpoena, saying it wants documents and information about the company's handling, storage and disposal of hazardous waste.
The company disclosed the subpoena in a regulatory filing Friday. California state and local government authorities are also investigating the matter, and Home Depot said it's cooperating.
The Atlanta-based seller of home-improvement merchandise said that while it can't predict the outcome of the probes, it doesn't expect the investigations to hurt its operating results or financial condition.
Shares of Home Depot, a member of the
Dow Jones Industrial Average
, were up 1 cent to $43.52 in after-hours trading.