Louis J. Pomponio Sr., 84, the founder and former president of a plumbing supply business and the father of three sons who developed high-rise complexes in Rosslyn and Crystal City and elsewhere in the Washington area, died Sunday at Arlington Hospital following a heart attack. He was stricken at his home in Arlington.

Mr. Pomponio, who was born in New York City, was in the plumbing supply business in Plainfield, N.J., before moving to Arlington in 1936. He founded the A & H Plumbing Supply Corporation and served as its president until 1960, when he retired and closed the firm.

He then became a consultant to his three sons, who founded the Pomponio Brothers Construction Company. That company built hotels, apartments and office buildings in Rosslyn and Crystal City in Arlington and also in Washington.

Mr. Pomponio was a member of the parish of St. Agnes Catholic Church in Arlington. He also was a member of the Knights of Columbus.

Survivors include his wife, Daisy, whom he married 55 years ago, of Arlington; three sons, Louis J. Jr. and Paul, both of McLean, and Peter, of Arlington; one daughter, Gloria McKeever, also of Arlington, and 10 grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the American Heart Association.