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Lead in Drinking Water: Sources, Risks, and Solutions

Lead is one of the most dangerous contaminants that can be in your drinking water, and one of the most common. The EPA estimates that approximately 9.2 million lead service lines still deliver drinking water to homes across the United States. Lead is a potent neurotoxin with no safe level of exposure — the EPA’s Maximum Contaminant Level Goal (MCLG) for lead is zero. Yet millions of Americans drink water with detectable lead levels every day, often without knowing it, because lead in water is colorless, odorless, and tasteless.

The Flint, Michigan water crisis brought national attention to lead in drinking water, but Flint was not unique — it was just the most visible example of a problem that exists in communities across the country. Understanding where lead comes from, who’s most at risk, and how to remove it is essential for protecting your household.

Where Lead in Drinking Water Comes From

Lead rarely comes from the water source itself (the river, lake, or aquifer). It enters your water as it travels through infrastructure — specifically, through lead-containing materials in the distribution system and your home’s plumbing.

Lead Service Lines

The biggest source. Lead service lines (LSLs) are the pipes that connect the water main under the street to your home. Before the 1950s, lead was the preferred material for these connections because it was durable, flexible, and easy to work with. An estimated 9.2 million lead service lines remain in use across the US, concentrated in older cities in the Northeast and Midwest — Chicago alone has an estimated 400,000 lead service lines, more than any other US city.

In October 2024, the EPA finalized the Lead and Copper Rule Improvements (LCRI), requiring water systems to replace virtually all lead service lines within 10 years (by approximately 2037). This is a landmark regulation, but it means millions of homes will continue to receive water through lead pipes for years to come.

Lead Solder

Before 1986, lead-based solder was commonly used to join copper pipes. The Safe Drinking Water Act amendments of 1986 banned lead solder for use in drinking water plumbing, but homes built before that date may still have lead solder in their plumbing. As the solder corrodes over time, lead leaches into the water flowing through the joints.

Brass Fixtures and Fittings

Brass is an alloy of copper and zinc, and it historically contained up to 8% lead. Faucets, valves, and fittings made from leaded brass can leach lead into water, especially hot water. The Reduction of Lead in Drinking Water Act of 2011 (effective 2014) reduced the allowable lead content in plumbing fixtures to 0.25% (weighted average), but older fixtures remain in millions of homes.

Galvanized Steel Pipes

Galvanized steel pipes (common in homes built before 1960) can accumulate lead on their interior surfaces over decades of exposure to lead-containing water. Even after a lead service line is replaced, the galvanized pipes inside the home may continue to release lead that has built up in their coating.

How Lead Gets Into Your Glass

Lead leaching is driven by corrosion — the chemical reaction between water and lead-containing materials. Several factors increase corrosion and lead levels:

Health Effects of Lead Exposure

Lead is a cumulative toxin that affects virtually every system in the body. There is no known safe level of lead exposure.

Children

Children are the most vulnerable population. Their developing brains and bodies absorb lead more readily than adults — children absorb 40-50% of ingested lead, compared to 3-10% for adults. Even low levels of lead exposure in children can cause:

The CDC uses a blood lead reference value of 3.5 µg/dL to identify children with elevated blood lead levels. However, research has shown that effects on IQ and behavior can occur at levels below this threshold. The scientific consensus is that no amount of lead exposure is safe for children.

Adults

Long-term lead exposure in adults is associated with:

Pregnant Women

Lead crosses the placenta and can affect fetal development. Prenatal lead exposure is associated with premature birth, low birth weight, and developmental delays. Lead stored in bones from past exposure can be released into the bloodstream during pregnancy, exposing the fetus even if current environmental exposure is low.

How to Test for Lead

You cannot see, taste, or smell lead in water. Testing is the only way to know if it’s there.

Check Your Water Quality Report

Your utility’s annual Consumer Confidence Report (CCR) includes lead testing results. Look for the “90th percentile” lead level — this represents the level at or below which 90% of tested homes fall. If the 90th percentile exceeds the Action Level of 15 ppb, the utility is in violation and must take corrective action. But remember: the CCR shows system-wide results, not your specific home. Your lead level could be higher or lower than the system average.

Get a Home Water Test

A home water test measures lead at your specific tap — the most accurate way to know your exposure. Two approaches:

First-draw sample: Collect water first thing in the morning (or after water has sat in the pipes for at least 6 hours) without running the tap first. This captures the highest lead concentration — the water that’s been sitting in contact with your plumbing the longest.

Flushed sample: Run the cold water for 2-3 minutes, then collect a sample. This represents the lead level in water that’s been flowing and has had less contact time with your plumbing.

Comparing the two samples tells you whether lead is coming from your home’s plumbing (high first-draw, low flushed) or from the service line/distribution system (elevated in both samples).

Where to test:

The EPA’s Lead Regulations

Lead in drinking water is regulated differently from most other contaminants:

Action Level (not an MCL): The EPA’s Action Level for lead is 15 ppb, measured at the 90th percentile of customer tap samples. This is not a health-based standard — it’s a trigger for corrective action. If more than 10% of tested homes exceed 15 ppb, the utility must implement corrosion control treatment, public education, and (under the new LCRI) accelerated lead service line replacement.

MCLG: Zero. The EPA’s health-based goal for lead is zero — no amount is considered safe. The gap between the MCLG of zero and the Action Level of 15 ppb is significant. Water at 14 ppb is “compliant” but far from the health goal.

Lead and Copper Rule Improvements (LCRI, 2024): The most significant update to lead regulations in decades. Key provisions include:

How to Reduce Lead Exposure Right Now

While you wait for lead service line replacement (which could take years), these steps reduce your exposure immediately:

Flush Your Pipes

Run cold water for 2-5 minutes before using it for drinking or cooking, especially first thing in the morning or after water has been sitting for several hours. This flushes out the water that’s been in contact with lead materials the longest. It’s not a perfect solution — it wastes water and doesn’t eliminate lead entirely — but it significantly reduces the concentration.

Use Cold Water for Drinking and Cooking

Always use cold water from the tap for drinking, cooking, and especially for preparing baby formula. Hot water dissolves lead more readily and typically contains higher lead levels than cold water. If you need hot water for cooking, heat cold water on the stove or in a kettle rather than using hot tap water.

Install a Certified Water Filter

This is the most effective immediate solution. Look for filters certified to NSF/ANSI 53 specifically for lead reduction. Certified filters must reduce lead from 150 ppb to 10 ppb or less — a reduction of at least 93%.

Filter types effective for lead:

Critical point: The filter must be specifically certified to NSF/ANSI 53 for lead. A filter that’s only NSF 42 certified (aesthetic effects) does not remove lead. Always verify the specific contaminant claims on the NSF, WQA, or IAPMO online database.

Replace Lead-Containing Plumbing

If your home has lead solder, leaded brass fixtures, or galvanized pipes with lead buildup, replacing these components permanently eliminates the source. A licensed plumber can identify lead-containing materials and recommend replacements. Costs vary widely depending on the extent of the work.

Is Your Home at Risk?

Your risk of lead in drinking water is higher if:

Even if none of these apply, testing is the only way to be certain. Lead can be present in unexpected places, and levels can change over time due to changes in water chemistry, pipe corrosion, or construction activity.

Frequently Asked Questions

Can boiling water remove lead?

No. Boiling water does not remove lead — it actually concentrates it by evaporating some of the water while the lead remains. For lead removal, you need a certified water filter (NSF 53 for lead) or a reverse osmosis system.

Does a Brita filter remove lead?

It depends on the model. The Brita Elite (formerly Longlast) filter is certified to NSF 53 for lead reduction. The Brita Standard filter is only NSF 42 certified and does not remove lead. Always check the specific filter model’s certifications.

Is there a safe level of lead in drinking water?

No. The EPA, CDC, and WHO all agree that there is no safe level of lead exposure. The EPA’s MCLG for lead is zero. The Action Level of 15 ppb is not a safety threshold — it’s an administrative trigger for corrective action. Any detectable lead in drinking water warrants consideration of filtration, especially in households with children or pregnant women.

My water utility says my water is safe. Should I still worry about lead?

Your utility tests water quality at the treatment plant and at select customer taps. The water leaving the plant may be lead-free, but lead can enter the water between the plant and your tap — through lead service lines, lead solder in your home’s plumbing, or brass fixtures. The only way to know your specific lead exposure is to test the water at your tap.

How quickly does a water filter remove lead?

Instantly — as water passes through a certified filter, lead is removed in real time. There’s no waiting period. However, the filter must be properly installed and within its rated capacity (gallon life). An expired filter may not remove lead effectively. Replace filters on schedule and verify certification for lead specifically.

The Bottom Line

Lead in drinking water is a solvable problem. Test your water to know your exposure, use cold water for drinking and cooking, flush your pipes after periods of non-use, and install a filter certified to NSF 53 for lead reduction. For households with children, pregnant women, or anyone concerned about lead, a certified under-sink carbon block filter or reverse osmosis system provides reliable, verified protection. The investment is small — $100-$600 for the system — compared to the irreversible health effects of lead exposure.

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