Lead can be found in old paint, contaminated soil, and drinking water. Lead-based paint was commonly used in older homes and buildings, and when it deteriorates, it can release lead dust or chips. Contaminated soil can occur near industries or areas with heavy traffic, where lead-based products or exhaust fumes have been released. Lead can also enter drinking water through corroded pipes or plumbing fixtures. Therefore, all the options mentioned - old paint, contaminated soil, and drinking water - can contain lead.