The family owners of a popular spa destination in Queens have been indicted on felony charges for failure to pay $1.5 million in taxes over the course of three years, authorities announced Wednesday.

The owners of Spa Castle Inc., a 100,000-square foot spa facility in College Point, Queens, didn't pay the sales, withholding, corporate and MTA surcharge taxes they owed from 2010 through 2013, state officials say.

"The scale of theft alleged in this case is staggering," said Acting Commissioner of Taxation and Finance Nonie Manion, who announced the indictment along with Attorney General Eric Schneiderman.

The investigation began when authorities executed a search warrant at Spa Castle Inc. in August 2015, and found records showing the spa owners underreported earnings and paid workers and vendors in cash.

Steven Chon, 57; his brothers Daniel Chon, 54, and Victor Chon, 50; and daughter Stepahanie Chon, 29, were arraigned Wednesday in Queens Supreme Court. Bail has been set at $100,000 bond.

Attorney information for them was not immediately available.