What Is Lead In Water And Why Is It Dangerous? Root Causes

Lead in drinking water is a serious public health issue that affects millions of Americans. Lead is a toxic metal that can enter your water through corroded pipes and plumbing fixtures, and it poses significant health risks even at very low levels. Because lead has no taste, smell, or color, you cannot tell if it is in your water without testing it.

What Is Lead In Water And Why Is It Dangerous?

Lead is a naturally occurring heavy metal that was used for decades in plumbing materials. When water sits in pipes or fixtures that contain lead, the metal can leach into the water. This is especially dangerous because lead accumulates in the body over time and there is no safe level of lead exposure.

The danger comes from how lead affects the body. Lead interferes with normal cell function and can damage the brain, kidneys, and nervous system. For adults, chronic exposure can raise blood pressure and contribute to kidney problems. For children and pregnant women, the stakes are much higher because lead can permanently harm brain development.

According to the Environmental Protection Agency (EPA), the action level for lead in public drinking water is 15 parts per billion. However, the American Academy of Pediatrics recommends that children’s drinking water contain no more than 1 part per billion. This difference shows how cautious experts are about lead exposure in vulnerable populations.

How Does Lead Get Into Your Drinking Water?

Lead enters drinking water primarily through corrosion, which is the dissolving of metal from pipes and fixtures. The most common sources are lead service lines that connect your home to the water main, brass faucets, and solder used to join copper pipes.

Homes built before 1986 are at the highest risk. That year, the Safe Drinking Water Act amendments banned the use of lead pipes and lead solder in new plumbing. However, older homes may still have lead service lines that were never replaced. Even homes built after 1986 can have brass fixtures that contain small amounts of lead.

Water chemistry plays a major role in how much lead leaches into your water. Soft water with low mineral content is more corrosive than hard water. Acidic water with a low pH also corrodes pipes more quickly. Water that sits in pipes for several hours, such as overnight, will have higher lead concentrations than water that has been running.

What Health Problems Does Lead Exposure Cause?

Lead poisoning is not an immediate illness with obvious symptoms. It develops gradually and can go unnoticed for years. The symptoms that do appear often mimic other conditions, which makes lead poisoning difficult to diagnose without a blood test.

In adults, lead exposure can cause high blood pressure, joint and muscle pain, memory problems, and difficulty concentrating. Long-term exposure can also reduce kidney function and may affect fertility in both men and women. Some research suggests a link between lead exposure and cognitive decline in older adults.

Children are far more vulnerable to lead’s effects. Their growing bodies absorb lead more easily than adult bodies, and their developing brains are especially sensitive. Even low levels of lead exposure in children have been linked to reduced IQ, attention problems, and behavioral issues. The Centers for Disease Control and Prevention (CDC) states that there is no safe level of lead in a child’s blood.

Pregnant women face additional risks. Lead can cross the placenta and reach the developing fetus, potentially causing premature birth, low birth weight, and developmental delays. The CDC recommends that pregnant women take extra precautions to avoid lead exposure.

How Do You Know If Your Water Has Lead?

You cannot see, taste, or smell lead in water. The only way to know if your water contains lead is to have it tested. Testing options vary depending on whether you use public water or a private well.

If you receive water from a public utility, your utility is required to test for lead and provide annual water quality reports. These reports tell you the levels of various contaminants, but they reflect system-wide averages rather than the water in your specific home. Your home’s pipes and fixtures may add lead that the utility cannot detect.

You can request a lead test from a certified laboratory. Many local health departments offer free or low-cost testing. When collecting a water sample, follow the instructions carefully. You typically need to collect water that has sat in the pipes overnight to get the most accurate reading of worst-case lead levels.

Home test kits are available at hardware stores, but their accuracy varies. Some kits can detect lead reliably, while others produce false results. If you use a home test kit and get a positive result, confirm it with a certified laboratory test before taking major action.

Consider testing if you live in a home built before 1986, if you have lead service lines, or if your water has a metallic taste. Testing is also wise if you are pregnant, have young children, or are planning a pregnancy.

What Can You Do To Reduce Lead Exposure?

If testing confirms lead in your water, several steps can reduce your exposure. The most effective long-term solution is replacing lead service lines and lead-containing plumbing fixtures. This is a significant expense, but some municipalities offer programs to help homeowners cover the cost.

Until pipes are replaced, you can take immediate steps to protect your family:

• Run cold water for 30 to 60 seconds before using it for drinking or cooking. Flushing clears water that has been sitting in pipes.
• Use only cold water for drinking, cooking, and making baby formula. Hot water dissolves lead more quickly than cold water.
• Install a certified lead-removal filter. Look for filters certified by NSF International or the Water Quality Association to remove lead. Check the certification label to confirm lead removal specifically.
• Clean aerators regularly. These small screens on faucets can trap lead particles and other debris.
• Do not boil water to remove lead. Boiling concentrates lead rather than removing it.

If you have a private well, test your water regularly. Well water is not regulated by the EPA, so the responsibility for testing falls on you. Lead can enter well water through brass well pumps, fittings, and soldered joints.

Is Lead In Water The Only Source Of Lead Exposure?

No. Lead in water is one of several sources of lead exposure, and for many people it is not the primary source. The most common source of lead exposure in children is lead-based paint and contaminated dust from older homes. Lead paint was banned for residential use in 1978, but homes built before then may still have layers of lead paint under newer paint.

Other sources include contaminated soil, especially near roads or older buildings, and certain imported goods such as pottery, cosmetics, and some traditional medicines. Some toys and jewelry have also been found to contain lead, though regulations have reduced these risks.

For most people, the combined exposure from all sources matters more than any single source. This is why public health experts focus on reducing lead exposure everywhere, not just in water. If you live in an older home, consider testing for lead paint and dust as well as water.

What Is Being Done About Lead In Water?

The EPA’s Lead and Copper Rule regulates lead levels in public drinking water systems. The rule requires water utilities to monitor lead levels, optimize corrosion control, and educate the public when lead levels exceed the action level of 15 parts per billion. The rule was revised in 2021 to strengthen requirements and accelerate lead service line replacement.

The Infrastructure Investment and Jobs Act, passed in 2021, allocated billions of dollars to replace lead service lines across the country. This is a long-term project that will take years to complete. In the meantime, individual households must take their own precautions.

Research published in the journal Environmental Health Perspectives has documented the effectiveness of corrosion control treatment in reducing lead levels. Water utilities can adjust the pH and mineral content of water to make it less corrosive, which reduces the amount of lead that leaches from pipes. This approach has been successful in many cities but does not eliminate the risk entirely.