The most common source of lead exposure is from paint in homes and buildings built before 1978, before lead-based paints were banned for use in housing. Lead-based paint and lead-contaminated dust are the main sources of exposure to lead in American youth. Although the main sources of exposure to lead are ingesting paint chips and inhaling dust, lead also can be found in some household plumbing materials and some water service lines. The Environmental Protection Agency states that lead pipes are more likely to be found in older homes built before Congress enacted lead-reduction requirements as part of the Safe Drinking Water Act amendments in 1986. As a result, homes built in or after 1986 are far less likely to have lead pipes.