Are Old Lead Pipes in Your Home a Health Risk?

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Yes. Lead that reaches your tap is a genuine health hazard, and the reason is simple: there is no level of lead in drinking water that health agencies consider safe. The good news buried under that blunt fact is that the risk is also manageable. Most of the lead exposure tied to home plumbing comes from a few specific places, it leaches into water under predictable conditions, and several of the steps that lower your exposure cost almost nothing and take a minute or two.

This guide explains where lead lives in a plumbing system, the mechanics of how it gets into the water you drink, who is hurt most by it, and what you can do today while a permanent fix is arranged. Figuring out whether your specific house has a lead service line is its own task with its own checks, so see our guide on how to find out if you have a lead service line (154) for that part.

Where Lead Hides in Home Plumbing: Service Lines, Pipe, Solder, and Brass

Lead in household plumbing usually comes from one of three places, and they matter in roughly this order.

The biggest single source is a lead service line, the buried pipe that connects your home to the public water main. The U.S. Environmental Protection Agency states that in homes that have one, this line is typically the most significant source of lead in the water, because it is often the largest piece of lead the water touches on its way to you.

The second source is lead solder on the joints of copper pipe. Solder is the metal that seals copper pipe connections, and solder made or installed before 1986 contained high levels of lead. Even when the pipe itself is copper, those soldered joints can shed lead into the water that sits against them.

The third source is brass. Older faucets, valves, and fixtures, including chrome-plated brass, were commonly made with brass alloys that contained lead. EPA notes that among homes without a lead service line, the most common problem is brass or chrome-plated brass faucets and plumbing with lead solder.

The year 1986 is the line that organizes all of this. That year, Congress amended the Safe Drinking Water Act to prohibit the use of pipes, solder, and flux that were not “lead free” in systems and plumbing providing water for human consumption. At the time, “lead free” was defined as solder and flux with no more than 0.2 percent lead and pipes with no more than 8 percent. The standard was tightened again by the 2011 Reduction of Lead in Drinking Water Act, which lowered the allowable content for pipes and fittings to a weighted average of 0.25 percent across their wetted surfaces. The practical takeaway: the older your home and its plumbing, the more reason you have to look into this, and a house plumbed before the mid-1980s deserves a closer look.

How Lead Gets Into Your Drinking Water

Lead does not sit politely inside metal. It enters drinking water when plumbing materials that contain lead corrode, and EPA singles out two water conditions that speed that corrosion: high acidity and low mineral content. Soft or aggressive water pulls more lead out of the same pipe than hard, mineral-rich water does.

Three things make leaching worse, and all three are within your control.

Standing water. The more time water sits in contact with lead, the more lead it can pick up. Water that has been still in the pipes overnight or through a workday has had hours to absorb lead, which is why the first draw in the morning tends to be the worst.

Hot water. Hot water is more corrosive and dissolves lead more readily than cold water. This is the reason every official recommendation tells you to use cold water for anything you will drink or cook with, and never to start with hot tap water to save heating time.

Disturbance. Physically jostling a lead line, even with good intentions, can break loose the protective mineral scale that has built up inside it and release a burst of lead particles. This is the counterintuitive part of lead work: replacing only part of a lead service line, or otherwise disturbing it, can cause a temporary spike in lead at the tap rather than an immediate improvement. EPA requires water systems to warn residents about exactly this and to provide flushing instructions, and sometimes a certified filter, after a line is disturbed or partly replaced. It is a real reason not to treat lead pipe as a casual weekend project.

Why There’s No Safe Level: Who’s Most at Risk

EPA and the Centers for Disease Control and Prevention agree on a sentence worth memorizing: there is no known safe level of lead in a child’s blood. Lead is persistent, and it bioaccumulates in the body over time, so the concern is not a single dramatic dose but the slow loading of repeated small exposures.

Infants, young children, and fetuses are the most vulnerable, because the physical and behavioral effects of lead occur at lower exposure levels in children than in adults. According to EPA, even low levels of lead in a child’s blood can contribute to behavior and learning problems, lower IQ, slowed growth, hearing problems, and anemia. Pregnant women carry a distinct risk: lead stored from past exposure is released from the mother’s bones during pregnancy and can cross the placenta to the developing fetus.

That is why the goal with lead is not to find an acceptable amount. It is to reduce exposure as far as you reasonably can, and to prioritize the people in the household for whom the stakes are highest. If your home has infants, young children, or anyone who is pregnant, treat the steps below as a priority rather than an option.

Lowering Your Exposure Today: Flushing, Cold Water, Aerators, and Certified Filters

You do not have to wait for a pipe replacement to start cutting your exposure. These measures are clearly safe for any homeowner to do, and they work on the leaching mechanics described above.

  • Flush before you draw drinking water. Because still water collects lead, run the tap before using water for drinking or cooking, especially after it has been sitting for hours. Running a shower, a load of laundry, or a dishwasher cycle also moves fresh water through the lines. How long to run the water depends on whether you have a lead service line and how long it is, so your water utility is the right source for a specific flushing time in your community.
  • Use only cold water for drinking, cooking, and making baby formula. Hot tap water carries more dissolved lead. Heat cold water on the stove if you need it warm for cooking or formula.
  • Clean your faucet aerators. The aerator is the small screen at the tip of the faucet, and lead particles and sediment can collect there. Unscrewing it and rinsing the debris out periodically keeps trapped particles from ending up in your glass. This is a routine maintenance step, not a repair.
  • Use a filter certified to remove lead. Not every filter handles lead, so the certification matters. Look for a unit certified to NSF/ANSI Standard 53 (or Standard 58 for reverse osmosis systems) with lead specifically listed on the package as a contaminant it reduces. Filters certified to these standards are tested against challenge water containing far more lead than EPA’s action level, and they must bring it down to a low residual. Replace the cartridge on the manufacturer’s schedule, because a spent filter stops protecting you. How to choose between a whole-house and a point-of-use filter is a broader decision covered in our guide on whole-house vs. point-of-use filters (147).

One thing that does not work, despite being widely believed: boiling. EPA is explicit that boiling water does not remove lead. Because boiling evaporates some water while the lead stays behind, it can actually leave the lead more concentrated. Boiling is the wrong tool for this problem.

These steps reduce exposure. They do not eliminate the source. The only permanent fix for a lead service line or lead interior piping is removal, and that is work for your water utility and a licensed plumber, not a do-it-yourself job. Pipe replacement and the signs that point to it are covered in our guide on when to repipe your house (106).

Getting Your Water Tested and What the Result Means

You cannot see, taste, or smell lead in water, so the only way to know how much is reaching your tap is to test. The general process of testing your home’s water, including what to collect and how to read a kit, is its own walkthrough, so see our guide on how to tell what’s in your home’s water (146) for the step-by-step.

What is worth understanding here is what a lead result tells you. A test measures the lead in the water as it actually comes out of your tap, which reflects the combined effect of your pipes, your water chemistry, and how long the water had been sitting. A first-draw morning sample and a sample taken after flushing can read very differently, which is useful: a big gap between them points to leaching from your own plumbing rather than from the water supplied to your street. If a test confirms lead, do not panic, but do act. Shift to the exposure-reduction steps above immediately, give priority to drinking and cooking water for children and pregnant household members, and contact your water utility, which can advise on next steps and on whether a lead service line is involved.

Frequently Asked Questions

Is it safe to drink water from lead pipes if I run the tap first?
Flushing the tap lowers your exposure by clearing out the water that sat longest in contact with lead, and it is a recommended step. It is a risk-reduction measure, not a guarantee of lead-free water, because lead can still leach during the time water moves through the pipe. Pair flushing with cold-water-only use, a certified filter, and a water test, and treat permanent removal as the real fix.

Does boiling water remove lead?
No. Boiling does not remove lead, and because some water evaporates while the lead stays behind, boiling can leave the remaining water with a higher lead concentration. Use a filter certified for lead instead, and use cold water for anything you will drink or cook with.

Which household members should I worry about most?
Infants, young children, and anyone who is pregnant. The effects of lead appear at lower exposure levels in children than in adults, and lead can pass from a pregnant person to the developing fetus. If your household includes any of these, make the reduction steps a priority rather than an afterthought.

Is a lead service line my responsibility or the utility’s to fix?
That depends on where the lead pipe sits and on local ownership rules, and it determines who arranges and pays for removal. Because disturbing a lead line can briefly raise lead levels, this is coordinated work for your utility and a licensed plumber rather than something to dig up yourself.

This article is general information, not professional or medical advice. For guidance specific to your home, water, and health, consult your water utility, a certified laboratory, a licensed plumber, and a medical professional.

Sources

  • EPA, Basic Information about Lead in Drinking Water: https://www.epa.gov/ground-water-and-drinking-water/basic-information-about-lead-drinking-water
  • EPA, Sources of Lead in Drinking Water: https://www.epa.gov/ground-water-and-drinking-water/sources-lead-drinking-water-text-only
  • EPA, Actions to Reduce Potential Lead Exposure: https://www.epa.gov/lead/actions-reduce-potential-lead-exposure
  • EPA, How does the Safe Drinking Water Act limit lead in pipes, plumbing fittings, fixtures, faucets, solder and flux?: https://www.epa.gov/lead/how-does-safe-drinking-water-act-limit-lead-pipes-plumbing-fittings-fixtures-faucets-solder
  • EPA, Use of Lead Free Pipes, Fittings, Fixtures, Solder, and Flux for Drinking Water: https://www.epa.gov/sdwa/use-lead-free-pipes-fittings-fixtures-solder-and-flux-drinking-water
  • EPA, Planning and Conducting Lead Service Line Replacement: https://www.epa.gov/ground-water-and-drinking-water/planning-and-conducting-lead-service-line-replacement
  • EPA, Consumer Tool for Identifying Point-of-Use and Pitcher Filters Certified to Reduce Lead in Drinking Water: https://www.epa.gov/water-research/consumer-tool-identifying-point-use-and-pitcher-filters-certified-reduce-lead
  • CDC, About Lead in Drinking Water (Childhood Lead Poisoning Prevention): https://www.cdc.gov/lead-prevention/prevention/drinking-water.html
  • NSF, NSF/ANSI 42, 53 and 401: Filtration Systems Standards: https://www.nsf.org/knowledge-library/nsf-ansi-42-53-and-401-filtration-systems-standards

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