Lead in US Drinking Water: Is Los Angeles' Tap Water Safe to Drink?

Lead is not present in Los Angeles’ source water, and the city does not add it. Where lead turns up in tap water, it enters somewhere between the water main and the faucet — from service lines, solder, brass fittings and fixtures inside individual buildings — which makes it a house-by-house question rather than a citywide one.

Where lead does appear, aging infrastructure is usually the reason. Some older homes and buildings still have lead solder, galvanized pipe or brass fixtures that can leach lead into the water.

Lead exposure, even at low levels, can have severe health consequences, especially for children and pregnant women. Lead is a neurotoxin that can impair brain development, leading to learning disabilities, decreased IQ, and behavioral problems. It can also cause damage to the kidneys, liver, and other organs. Long-term exposure to lead has been linked to an increased risk of cardiovascular diseases and certain cancers.

Because the risk depends on what your own pipes and fixtures are made of, a citywide result cannot tell you what is coming out of your tap. Testing your own water is the only way to know where your household actually stands. By receiving a free water test, Los Angeles residents can then take steps to ensure their drinking water is safe.

Lead is a toxic metal that can have detrimental effects on human health, particularly in children and pregnant women.

Exposure to lead in drinking water can lead to various health problems. In children, it can impair brain development, resulting in learning disabilities, decreased IQ, and behavioral issues. Pregnant women exposed to lead may experience complications such as premature birth, low birth weight, and developmental delays in their babies. Additionally, lead exposure can cause kidney damage, reproductive problems, and increased blood pressure in adults.

Where lead does appear, aging infrastructure is usually the reason. As these pipes corrode over time, lead particles can leach into the water, especially when the water is acidic or has been sitting stagnant for long periods.

A utility’s responsibility for lead sits on its side of the meter: corrosion control treatment that keeps the water from pulling lead out of plumbing, annual sampling at household taps, and an inventory of the service lines it owns. What none of that reaches is the plumbing inside a privately owned building, which is where lead in tap water actually originates.

Lead is worth taking seriously precisely because it gives no warning. It has no taste, no color and no smell, the health effects fall hardest on children and pregnant women, and the source is the plumbing inside the building rather than anything the utility delivers. That combination means one home can be fine and the house next door not, regardless of what the citywide numbers say, and testing is the only way to tell the difference.

Lead is worth understanding because of what it does at low doses, particularly to children, and because a household cannot see, taste or smell it. In drinking water it comes from the plumbing between the water main and the tap rather than from the source water or the utility’s treatment, which is why the answer for any one home depends on that home’s own pipes and fixtures. Lead-based paint and lead in soil are separate exposure routes with their own testing and remediation.

1. Is there lead in Los Angeles drinking water?
Lead is not in the source water and LADWP does not add it. Where lead shows up at a tap, it has come from that building’s own service line, solder, brass fittings or fixtures — so whether there is lead in your water is a question about your property rather than about the city, and a test is how a household finds out.

2. How does lead exposure occur in Los Angeles?
Lead exposure can occur through various sources in Los Angeles, such as lead-based paint in older homes, contaminated soil, and drinking water from lead pipes or fixtures. Children are particularly vulnerable to lead exposure, which can lead to developmental issues.

3. Who is responsible for lead in my water?
Responsibility splits at the property line. The utility treats the water to limit corrosion, samples household taps each year and reports the results, and maintains an inventory of the service lines it owns — your water utility can tell you whether your service line has been surveyed. The pipes, solder and fixtures inside the building belong to the property owner, and that is the part a tap test actually measures.

4. How can I test my home for lead in Los Angeles?
Homeowners in Los Angeles can contact certified lead inspectors or laboratories to conduct lead testing. The Los Angeles County Department of Public Health also provides information on lead testing and offers resources for lead-safe renovations.

5. What can I do to protect myself and my family from lead exposure in Los Angeles?
To protect against lead exposure, ensure your home is free from lead-based paint hazards, regularly clean dust and soil, use cold tap water for drinking and cooking, and provide a balanced diet rich in calcium and iron. Regularly wash hands, especially before eating, and consult healthcare professionals for lead testing and guidance.

Because lead in drinking water comes from the plumbing inside each building, a citywide sampling result describes the system rather than any one home. That is what makes this a question settled at the property: testing your own water, using cold water for drinking and cooking, and knowing what your service line and fixtures are made of are what tell you where your household actually stands.

One of the major health concerns associated with lead exposure is its impact on the nervous system. Lead can cause developmental delays and learning disabilities in children, leading to long-term cognitive impairments. Additionally, it can affect the cardiovascular system, leading to increased blood pressure and an increased risk of heart disease.

Lead exposure is particularly dangerous for pregnant women as it can cross the placenta and harm the developing fetus. It can result in premature birth, low birth weight, and developmental issues in newborns.

For children, the effects of consuming lead-contaminated water are especially high. Once consumed, lead remains in our bodies or ‘bioaccumulates’, as we can’t flush the contaminant from our system. Once there, lead can cause serious behavioral and cognitive problems for children, and over time it can lead to:

Furthermore, lead can accumulate in the body over time, causing chronic health problems. It can damage the kidneys, impair the reproductive system, and even lead to cancer.

To address these health concerns, it is crucial for the residents of Los Angeles to be aware of the potential lead contamination in their water supply. Regular testing of water sources, especially in older homes, is essential to identify and mitigate lead exposure risks.

Lead also crosses the placenta, so it’s especially important for pregnant women to avoid drinking water contaminated with lead. In addition to harming the mother, it can cause stunted fetal growth and premature birth.

For the average adult, lead exposure from water can cause heart and cardiovascular issues, reduce kidney function, and contribute to reproductive problems.

The degree and severity of these issues depends on how much lead you’ve been exposed to, and how much is stored in your body, though governing health authorities like the Centers for Disease Control (CDC) caution that no amount of lead is safe.

In its 2024 water quality report, the Los Angeles Department of Water and Power (LADWP) sampled 105 homes for lead and reported a 90th-percentile result of 3.9 parts per billion, below the 15 parts per billion action level. That is a real result, and it is worth being precise about what it does and does not say. The action level is a trigger for utility-side corrosion control, not a health-based safety line — California’s public health goal for lead is 0.2 ppb, far below the level most labs report down to, so a result below the action level does not establish that a home sits under the health goal. And because lead comes from each building’s own plumbing, a sample of 105 homes describes the system, not your house.

In the U.S., 14–20% of total lead exposure comes from drinking water, and in older homes with legacy plumbing systems, that number may be even higher. Over the past three decades, cities like Los Angeles have worked to reduce lead exposure by banning lead solder, minimizing corrosivity in water treatment, and replacing lead service lines. These efforts have reduced lead levels overall—but risks still remain.

Even trace amounts of lead can cause lasting health damage. Research has shown that low-level, chronic lead exposure can lower IQ, impair neurological development, and contribute to behavioral issues in children. Pregnant women and infants are especially vulnerable. Because lead accumulates in the body over time, even small exposures can add up.

Lead’s long history in plumbing plays a big role in today’s contamination risks. It was widely used because it’s cheap and easy to mold, which made it a popular material for pipes and solder. In the U.S., lead piping was standard until the 1920s and 1930s, and many older neighborhoods in Los Angeles—especially those built before 1986—may still contain legacy lead plumbing components.

In Los Angeles, most lead contamination doesn’t start at the water treatment plant—it starts in your home. The LADWP’s treated water typically leaves facilities lead-free, but it can pick up lead as it moves through service lines, plumbing, and fixtures.

Aging infrastructure is the biggest culprit. Many Los Angeles homes built before the Safe Drinking Water Act amendments in 1986 still contain lead pipes, lead solder, or brass fixtures with lead content. Over time, these components corrode, especially when the water is acidic or has high mineral content. This corrosion allows lead particles to leach into your drinking water.

When water sits in lead-containing pipes for extended periods—such as overnight or during low usage—it has more time to absorb lead. Disturbances in the plumbing system, like repairs or construction, can also dislodge lead particles and release them into your tap water.

Risk tracks the age of the building rather than any particular part of the city. Properties built before the 1986 federal restrictions on lead solder and lead-bearing plumbing are the ones most likely to still contain legacy lead components. Because the plumbing inside a property is privately owned, a utility-side service line program cannot reach it, which is what keeps this a house-by-house question.

The best way to protect your household is to test your water regularly, especially if you live in an older home. You can also install a certified lead-removal water filtration system, such as those that use reverse osmosis or activated carbon.

The best way to avoid a lead problem is to never have one. Despite the ongoing issues in many cities throughout America, many homeowners are simply not keen on getting a simple water test.

A test can determine whether your household has lead in its tap water, and whether that exposure can be reduced in the interim by flushing the line for a specified amount of time. Knowing this can be the difference between your family being exposed to lead in tap water and staying safe from it.

The Flint Crisis was a situation where the water was improperly treated – specifically, a severe act of negligence on the part of public officials failing to add corrosion inhibitors to the water. Given the heightened sense of awareness and knowledge of the issue, a repeat on that scale is far less likely today.

However, that doesn’t mean all water in your home is safe. Even treated water can leach lead into its supply if your pipes or fixtures are made of lead.

The final tally on the Flint Water Crisis, which included e.coli bacteria, THMs, lead, and a Legionnaire’s disease outbreak, resulted in 6,000 to 12,000 children exposed to lead and a slew of lawsuits, investigations, resignations and criminal indictments.