If your home was built before 1986, you might have lead in your tap water. Many houses built through the early 1900s have lead service lines and pipes, and homes built through the late 1980s have copper pipes and fittings joined with lead-based solder. Brass faucets and fittings contain lead, too. When water that's acidic or low in mineral content sits in older plumbing systems for several hours, lead can leach into the water. However, even if you have lead in your plumbing system, your water might be safe to drink. That's because, over time, minerals in water coat the insides of pipes, helping to prevent leaching of lead.
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