The EPA stands for the United States Environmental Protection Agency (also known as USEPA). It is a federal agency that oversees the protection of human health and the environment. It originated in 1970 during the presidency of Richard Nixon and was approved by Congress to enforce various laws and regulations that fell under this scope. The organization is run by an administrator (currently Lisa P. Jackson) and has 18,000 full-time employees. The primary responsibilities of the EPA incude research, education and environmental assessment; more than one-half of its staff are engineers, scientists or specialists. There are other EPA organizations in other countries, but you are probably specifically referring to the U. S. group.
I believe you are asking about the Environmental Protection Agency, which is a government agency whose mission is to protect health and the environment.
Its actual mission reads:
The mission of EPA is to protect human health and to safeguard the natural environment -- air, water and land -- upon which life depends.
The EPA is important especially with the disgraceful actions that many organizations have taken to ruin the environment, an example being the recent petroleum spill on the Gulf.
The EPA is the Environmental Protection Agency. As its name implies, the mission of this agency is to write rules and enforce laws that are meant to protect the environment. These laws and rules are often very controversial. This is because conservatives tend to believe that they are too strict and that they hurt the economy while liberals tend to believe that they are too lenient and allow too much damage to the environment.
The EPA was created in 1970. Ironically enough, given the way politics are today, it was a Republican (Richard Nixon) who proposed the creation of the EPA.