PHOENIX -- One in 10 Arizona workers is here illegally, according to a revealing new study.

The Pew Hispanic Center says the new number is based on U.S. Census data and their own surveys.

Steven Camarota, an immigration critic with the Center for Immigration Studies, said the Arizona figure contrasts to the national picture.

"Nationally, we think that about 5 percent of workers in the country are illegal immigrants," Camarota said.

Both anti-illegal immigration critics and immigration reform supporters consider Pew a reliable source.