Lead can come from many sources but the most common are: Lead contaminated dust, Soil with high levels of lead, Older homes that were painted with lead based paint, Plumbing--some pipes are laced with lead and can contaminate drinking water. Children under the age of six are the most are risk for lead poisoning and health officials say that more than four percent of all children in the United States have lead in their blood at some level. This puts children at high risk for serious health issues. Studies show that high levels of lead in the body can affect the brain, kidneys and bone marrow. Children with low levels of blood can have problems paying attention and learning difficulties. The symptoms of lead poisoning can be confusing because they are similar to other conditions. They include abdominal pain, a headache, vomiting, confusion and muscle weakness.