Lead and arsenic are naturally occurring elements that can be dangerous to a person's health in high levels. One lead arsenic connection is in the manufacturing of lead batteries. Manufacturing facilities that make these batteries are under strict guidelines about how to dispose of these chemicals so that the environment can be protected. However industrial accidents do happen and one or both of these elements can seep into the soil or water supply. The EPA has issued civil penalties and fines to companies that have exposed lead arsenic to the environment. Arsenic is classified as a carcinogen by the Environmental Protection Agency (EPA) when individuals are exposed long-term. Short term, acute exposure can cause immediate symptoms that may resemble a stomach flu such as vomiting and muscle aches. While lead is only considered a probable carcinogen long-term exposure can damage many organs, including the kidneys. Studies have shown that lead has caused cancer in animals.