TL;DR:

Lead can enter drinking water from old pipes and fixtures, especially in homes built before 1986. The Flint water crisis showed how quickly this can become a public health disaster. Millions of Americans still receive water from systems that violate lead safety rules, often with little enforcement.

Lead can enter drinking water when old pipes, fixtures, or solder begin to corrode. This happens more easily when water is acidic or low in minerals. Lead can leach into the water from lead pipes, brass or chrome-plated brass faucets, and lead solder, especially when hot water is used.

Homes built before 1986 are more likely to have plumbing that contains lead. That year, changes to the Safe Drinking Water Act (SDWA) reduced how much lead is allowed in plumbing materials. Even so, materials labeled “lead-free” can still legally contain small amounts of lead.

The Flint, Michigan Water Crisis

The danger of lead in drinking water became widely known during the Flint, Michigan water crisis. In 2014, the city changed its water source. Soon after, residents noticed problems with the water’s color, smell, and taste.

For months, officials denied there was a serious issue. During that time, corrosive water damaged the city’s pipes, causing lead to leach into the drinking water. The damage was so severe that switching back to the original water source could not undo it. The crisis led to widespread lead exposure and long-term health concerns, especially for children.

This Is Not Just a Flint Problem

Lead contamination is not limited to one city. More than 18 million Americans receive drinking water from systems that have violated federal lead standards.

Even more concerning:

  • In 9 out of 10 cases, the EPA took no enforcement action

  • Some water systems used improper testing methods that made lead harder to detect

This means many communities may not know they have a lead problem until damage has already occurred.

Why This Matters

Lead is toxic, especially to children. It can affect brain development, behavior, learning, and overall health. There is no safe level of lead exposure.

The lead problem in drinking water highlights a larger issue: our system often responds only after harm is done, rather than preventing exposure in the first place.