Lead in Tap Water: What Every Parent Needs to Know (And Do)

Here's something many people get wrong: lead contamination in tap water almost never comes from the original water source. Reservoirs, rivers, and underground aquifers don't naturally contain lead at dangerous levels. The lead comes from your plumbing.

Specifically, it comes from three places: lead service lines (the underground pipes that connect the water main to your house), lead solder that was used to join copper pipes together, and older brass fixtures like faucets that contain lead alloys.

When water sits in contact with these materials — especially for several hours overnight — it slowly picks up lead particles. The chemistry gets worse when the water is slightly acidic or soft, because those conditions accelerate corrosion. That's partly why Flint was such a disaster: the city switched to a more corrosive water source without adjusting their treatment process, and the lead levels in some homes spiked catastrophically.

The United States banned lead pipes and lead solder in new construction in 1986. But here's the math problem: there are still an estimated six to ten million lead service lines in the ground across America, many of them connecting pre-1986 homes. If your house was built before 1986, there's a real chance you have lead somewhere in your plumbing system — even if you're renting, even if the house looks updated inside.

The EPA regulates lead in tap water under the Lead and Copper Rule, which establishes an "action level" of 15 parts per billion (ppb). But I want to be direct about something: 15 ppb is not a safety threshold. It's an administrative trigger point. When more than 10% of sampled homes in a water system exceed 15 ppb, the utility is legally required to take action.

The EPA's own public health goal for lead — the level at which there is truly no known health risk — is zero. Not 15. Not 5. Zero.

The CDC and the American Academy of Pediatrics both state that there is no safe blood lead level in children. Lead exposure at even low levels has been linked to reduced IQ, attention deficits, learning disabilities, and behavioral problems. The damage is cumulative and largely irreversible. This isn't alarmism — it's the scientific consensus.

What this means practically: if you see a lead level of 8 ppb in your ZIP code's water data, you shouldn't feel totally comfortable just because it's below 15 ppb. Below 15 means the utility isn't legally required to act. It doesn't mean you personally shouldn't take steps to reduce your family's exposure.

The 90th percentile figure you see in most water quality data (including on WaterSafeCheck) refers to the level at or below which 90% of sampled homes tested. So if the 90th percentile is 6 ppb, that means 90% of homes had lead at or below 6 ppb — but 10% may have had more. If your home has old plumbing, you could be in that 10%.

I've seen a lot of water quality advice that's vague or unhelpful. So let me be specific about what actually works.

Flush your cold tap before using it. Run your cold water for at least 30 to 60 seconds — or until it feels as cold as it's going to get — before using it for drinking or cooking. This is especially important first thing in the morning or after any period of time when the faucet hasn't been used. You're flushing out the water that sat in contact with pipes overnight. It wastes a small amount of water, but it's one of the most effective things you can do immediately.

Only use cold water for drinking and cooking. Hot water dissolves lead from pipes much faster than cold water. Never use hot tap water to make infant formula, cook pasta, or fill a kettle. This one is simple and most people don't do it.

Get a certified filter — but buy the right kind. This is where I see a lot of families make mistakes. Standard Brita pitcher filters (certified to NSF/ANSI Standard 42) are great for improving taste and removing chlorine. They are not reliably certified to remove lead. To remove lead, you need a filter certified to NSF/ANSI Standard 53 (most under-sink carbon block filters and some pitcher filters) or Standard 58 (reverse osmosis systems under the sink). Check the NSF International website at nsf.org to verify any filter's actual certification before buying.

Test your own tap — not just the utility data. Utility-wide lead data tells you the average picture. It doesn't tell you what's coming out of your specific faucet. Your home's individual plumbing matters more than the neighborhood average. Many state health departments offer free or very low-cost lead testing kits. You can also order a certified test kit online for around $20 to $30. It's the only way to truly know.

Find out if you have a lead service line. Contact your water utility and ask directly whether your address has a lead service line. The EPA's 2021 Lead and Copper Rule Revisions now require utilities to maintain an inventory of all service line materials. Many utilities are actively replacing lead service lines and have programs to do it at no cost to homeowners. This is worth asking about.

Formula-fed babies are at significantly higher risk from lead in water than breastfed babies or older children, for one straightforward reason: formula accounts for nearly 100% of their food intake, and it's mixed with water. A baby consuming formula made with lead-contaminated water is getting a large, repeated dose relative to their tiny body weight.

The American Academy of Pediatrics recommends using filtered water (certified NSF/ANSI 53 or 58) or bottled water specifically labeled safe for infant formula when preparing formula for babies under 12 months. Never use hot tap water. If you use cold tap water, flush for 60 seconds first — but honestly, if you have any reason to suspect lead in your water, just use a certified filter or bottled water for formula. The peace of mind is worth it.

If your child has had regular exposure to tap water and you're concerned, ask your pediatrician for a blood lead level test. This is a standard, inexpensive blood draw that gives you an actual answer about your child's exposure — far more useful than worrying.

If your water system has exceeded the EPA action level for lead, you should have received a notice — but don't count on having read it. These notices often arrive in water bills or as postcards during violation periods, and they're easy to miss.

If you discover your utility has an active or recent lead violation, here's what to do: First, switch to filtered or bottled water for drinking, cooking, and baby formula immediately. Don't wait. Second, contact your utility directly and ask what corrective actions they're taking and what the current lead levels are at the tap. Third, consider having your home's water independently tested so you know your specific situation.

You can also contact your state drinking water agency, or call the EPA Safe Drinking Water Hotline at 1-800-426-4791. If you feel your utility isn't responding adequately, state agencies have enforcement authority that the EPA often delegates to them.

The important thing to understand is that a lead violation doesn't mean your water will be contaminated forever — utilities are required to fix the problem. But until the fix is in place and verified, you should take protective steps.