WASHINGTON — Sen. Charles Schumer demanded yesterday that the Interior Department provide a date for when the Statue of Liberty will reopen after the site sustained damage in Hurricane Sandy.

“The Statue of Liberty is still shuttered more than three months after Sandy . . . New Yorkers need to know that the end is in sight,” Schumer said. “Lady Liberty cannot be allowed to languish any longer.”

Sandy damaged Liberty Island’s docks and promenade and impaired electrical, wastewater-treatment and security-screening systems. About 400 employees have been laid off due to the closure, Schumer said.

Interior Department spokeswoman Jessica Kershaw said yesterday the landmark will reopen “as soon as it’s safe . . . and not a single second later.”