This is a huge money pit. This is the most recent in depth study I could find, several sites on the subject link to Huddle's study. The study doesn't take into account recent California immigrant privileges.
Mass Immigration Cost American Taxpayers $69 Billion Net and 2 Million Jobs in 1997
Excerpt
Study by Dr. Donald Huddle Reports Legal Immigration of over 1 Million Per Year Accounts for over 62% of Costs
State Costs to Taxpayers are Also Soaring (1996 Net Costs % up from 1992):
California: $28 billion up 35%
New York: $14 billion up 29%
Texas: $7 billion up 37%
Florida: $6 billion up 77%
The first study of the net cost of immigration to American taxpayers in 1997 conducted by Dr. Donald Huddle, Professor Emeritus of Economics at Rice University, found that:
The nearly 26 million legal and illegal immigrants settling in the United States since 1970 cost taxpayers a net $69 billion in 1997 alone, in excess of taxes those immigrants paid. This represents a cost of $260 in additional taxes paid by each U.S. resident or $1,030 in additional taxes paid by each family of four. This cost is a substantial increase over the net immigration costs of $65 billion ins 1996, $51 billion ins 1994, $44 billion in 1993, and $43 billion in 1992.
Over 62% of the net national cost of immigration in 1996, $40.6 billion, was attributable to legal and legalized (amnesty) immigrants. Illegal immigration generates about 38%, $24 billion of the total net cost. Legal immigration levels are over one million per year, and rising.
Rest of the study