Fifteen of the nation's most prominent law firms will represent the groups in class action, civil action and nuisance lawsuits.
The first state targeted by the suits is North Carolina, which is one of the nation's largest hog-producing states.
N.C. farmers are allowed to deposit hog waste in large open-air lagoons, which some say are unsanitary and damage the environment.
But hog company officials said they are not intimidated by the environmentalists' efforts and believe the case will fail.
At a Wednesday press conference in Washington D.C., Water Keeper Alliance president Robert F. Kennedy Jr. said the federal Environmental Protection Agency and state government's failure to regulate the hog industry has provoked the recent legal action.
Kennedy said the agency has had problems enforcing the standards set by the Clean Air and Clean Water Acts ever since the EPA's budget was cut in half by Congress in 1995.
"The only hope of civilizing this industry is to confront them directly," he said in a telephone press conference.
"The private bar is the only place that citizens can go for redress."
Kennedy added that each law firm suing the hog industry has donated $50,000 to aid in the legal actions.