Costa (born October 9, 1958) was a member of the Maryland House of Delegates, and until his retirement represented District 33B, which is located in Anne Arundel County.
He defeated Democrat Mike Shay in the 2006 election.
In 2002 he defeated Democrat Dotty Chaney to initially capture the seat of this newly created district.
He announced his retirement in 2014.
He was succeeded by Sid Saab, real estate investor and the first member of the Maryland General Assembly to have been born in Lebanon.