Lead in drinking water is one of the most serious water quality threats facing American homes today. Unlike bacteria or chemical contaminants that water treatment plants can remove before water enters distribution pipes, lead enters your home through the plumbing in your walls, under your foundation, and in your fixtures. This means that even if your city's water system is treated perfectly, the water coming out of your kitchen faucet could contain dangerous levels of lead. For parents and homeowners, understanding where lead comes from, how it affects health, and what steps to take is essential to protecting your family.
How Lead Gets Into Your Drinking Water
Lead does not naturally occur in water at high levels in most municipal supplies. Instead, it leaches into water as it travels through corroded pipes and plumbing materials in homes and buildings. The source of lead in your tap water is almost always your own home's plumbing system, not the water treatment plant.
Old Lead Service Lines
The most significant source of lead in residential water is the service line, the pipe that connects your home to the municipal water main. Homes built before 1986 are at highest risk. Many of these service lines are made from lead or contain lead-lined connections. When acidic water or water with low alkalinity flows through these pipes, it dissolves lead from the pipe walls into your drinking water. Even a service line that looks fine on the outside can leach substantial amounts of lead on the inside.
Brass Fittings and Solder
Inside your home, lead enters water through brass fittings, connectors, and most commonly, through solder that joins copper pipes together. Before 1986, the EPA allowed plumbers to use solder containing up to 50 percent lead. When water sits in pipes overnight or for extended periods, it has more contact time with these materials, increasing lead absorption. This is why water that has been sitting in pipes since you last used them (sometimes called first draw water) typically contains higher lead levels.
Corroded Fixtures
Faucets, showerheads, and other fixtures can also contain lead and release it into water, especially hot water. Chrome-plated brass faucets are common sources. The corrosion happens when water chemistry is off-balance or when older fixtures deteriorate over time.
The EPA Action Level for Lead
The EPA does not set a maximum contaminant level (MCL) for lead in drinking water. Instead, it uses an action level of 15 parts per billion (ppb). This means that if testing shows lead at or above 15 ppb in more than 10 percent of samples in a water system, the water company must take action. However, this action level does not mean 15 ppb is safe. It is a trigger for water systems to act, not a health-based safety threshold.
The EPA and the Centers for Disease Control and Prevention (CDC) acknowledge that no level of lead exposure is truly safe, especially for children. Even low levels can cause harm over time. Many public health experts recommend action at levels well below 15 ppb.
Health Effects of Lead Exposure, Especially in Children
Lead is a neurotoxin that damages the developing brain. Children ages birth to 6 are most vulnerable because their brains are rapidly developing and they absorb lead more efficiently than adults.
Effects on Child Development and Learning
Exposure to lead during early childhood is associated with reduced IQ, lower academic achievement, and behavioral problems. Studies have found that children exposed to lead show measurable declines in intelligence scores. The CDC reports that even blood lead levels below 5 micrograms per deciliter (mcg/dL), previously considered safe, are associated with reduced IQ and attention span in children. Higher exposures can cause developmental delays, learning disabilities, and difficulty concentrating in school.
Long-Term Health Consequences
Lead exposure can cause permanent damage. Children who were exposed decades ago often carry the cognitive and behavioral effects into adulthood, affecting graduation rates, employment, and lifetime earnings. In adults, lead exposure raises blood pressure, increases the risk of heart disease and stroke, and can affect kidney function and reproductive health.
Pregnant Women and Infants
Pregnant women exposed to lead can pass it to their unborn child, affecting fetal development. Lead stored in bones can be mobilized during pregnancy and lactation, potentially exposing the developing fetus and nursing infant.
Cities and Communities with the Worst Lead Problems
While lead in water is a national issue, some cities have faced particularly severe contamination.
Flint, Michigan
Flint became the face of America's lead crisis when the city switched its water source in 2014 without properly treating the water to prevent corrosion. Lead leached from aging pipes into thousands of homes. The city's water system had some of the highest lead levels ever documented in a major U.S. city. Although treatment has improved, some Flint residents still test positive for elevated blood lead levels, and the damage to children's health is being studied for years to come.
Newark, New Jersey
Newark struggled with widespread lead contamination affecting over 20,000 households. Testing revealed that nearly 40 percent of water samples exceeded the EPA action level. The city distributed filters to residents and worked to replace lead service lines, but the problem persisted for years.
Pittsburgh, Pennsylvania
Pittsburgh's aging water infrastructure meant that high percentages of water samples tested positive for lead above the action level. The city has an ongoing program to replace lead service lines and improve water treatment, but it remains a community where residents should take lead seriously.
These cities are not unique in having lead problems. Many older cities across the nation with aging water infrastructure face similar challenges. Use the free ClearWater ZIP code lookup tool at checkclearwater.com to see what water quality data your utility has reported and whether lead is flagged as a concern in your specific area.
How to Test Your Home Water for Lead
Testing is the only way to know if lead is in your tap water. You cannot see, taste, or smell lead.
EPA-Approved Lab Testing
The most reliable method is to have your water tested by a certified laboratory. The EPA maintains a list of certified labs in every state. Contact your state's drinking water program (usually part of the Department of Environmental Quality or Department of Health) to find a certified lab near you. Lab testing typically costs $25 to $75 per sample and takes 7 to 10 days for results.
For the most useful results, ask the lab to test first-draw water (water that has sat in your pipes for at least 6 hours) and after-flushing water (water that has run for 30 seconds). This shows you the full picture of lead in your home's system.
Home Test Kits
Inexpensive home test kits are available at hardware stores and online. These are less reliable than lab testing because they depend on proper use and interpretation, but they can give you a quick initial screening. If a home kit shows lead present, follow up with lab testing for confirmation.
What to Do if You Find Lead
If testing shows lead above 5 ppb, take action. Start with simple steps: run your tap for 30 seconds each morning to flush stagnant water from pipes, use only cold water for drinking and cooking (hot water leaches more lead), and avoid boiling water as a way to remove lead (boiling concentrates lead). These are temporary measures only.
Contact a licensed plumber to inspect your plumbing for lead sources. If you rent, notify your landlord immediately in writing, as landlords are responsible for maintaining safe water. If you own your home, consider having lead service lines replaced, though this is expensive and not always necessary if water treatment is effective.
Certified Filters and Water Treatment for Lead Removal
Point-of-use filters (filters attached to your tap or a pitcher) and point-of-entry treatment (whole-house systems) can reduce lead in your water if the source is within your home's plumbing.
NSF/ANSI Certified Filters
Look for filters certified by NSF International or the American National Standards Institute (ANSI) specifically for lead reduction. Certification means the filter has been tested independently and proven to reduce lead to safe levels. Check the product packaging or NSF's online database to confirm certification. Different filters remove different percentages of lead, so check the specific claim for the product you choose.
Types of Treatment
Activated carbon filters work well for lead removal and are affordable. Reverse osmosis systems are highly effective but waste water and are slower. Ion exchange filters (water softeners) can also remove lead. The best choice depends on your budget, how much filtered water you need, and your water chemistry. If you have very acidic water or low pH, treatment that raises pH and adds alkalinity (called pH adjustment) may be more effective than filtration alone, since it reduces corrosion in your pipes.
Maintenance Is Critical
Filters only work if you replace them on schedule. A clogged or overdue filter loses effectiveness and can become a breeding ground for bacteria. Follow the manufacturer's replacement schedule strictly. Some filters need replacement every month, others every six months. Write the replacement date on the filter so you do not forget.
Steps to Take Today
Protecting your family from lead does not require waiting for perfect information. Take these concrete steps right now:
- Check your home's age and construction. If built before 1986, lead risk is higher.
- Use the free ClearWater lookup tool at checkclearwater.com to see if your water utility has reported any lead violations or concerns.
- Contact your local water utility and ask directly about lead in your area and whether your home's service line is lead or copper.
- Flush your tap for 30 seconds each morning immediately, especially if you have young children or are pregnant.
- Use cold water for drinking and cooking, not hot water from the tap.
- Call your state's drinking water program to find a certified lab and schedule testing of your tap water.
- Once you have test results, if lead is present, install an NSF-certified filter immediately while you decide on longer-term solutions.
- If you rent, provide your landlord with written notice of any lead concerns and request testing and remediation.
The Bottom Line
Lead in drinking water is a serious but manageable problem. The key is taking action: test your water, understand your risks, and use proven solutions like certified filters. Lead exposure is preventable, and most of it occurs in your home, not at the water treatment plant. By understanding where lead comes from and taking steps to remove it, you take control of your family's health. Your children's future development and intelligence depend on reducing their lead exposure now.