Lead in Tap Water: How to Know If Your Home Is at Risk

Lead in tap water is a preventable exposure that still affects millions of U.S. households. Unlike PFAS, which enters water at the treatment plant level, lead typically leaches into water from your home’s own plumbing — lead service lines, lead solder, and brass fixtures. The damage is real: there is no safe level of lead exposure for children, and the cardiovascular effects in adults are more severe than previously understood.

Quick answers

Does my home have lead pipes? Homes built before 1986 are at highest risk. Lead was banned in plumbing materials in 1986. Homes built before 1930 may have all-lead service lines from the street to the house.

How do I test my tap water for lead? An at-home lab test (Tap Score, SimpleLab) is the most reliable method. Your utility’s Consumer Confidence Report (CCR) reflects treatment plant output, not your specific tap.

What water filter removes lead? Any filter certified to NSF/ANSI 53 with a “lead reduction” claim on the label. Look for the specific certification, not just “carbon filter.”

Is there a safe level of lead? No. The EPA’s maximum contaminant level goal (MCLG) for lead is zero. The 15 ppb “action level” is an enforcement trigger, not a safety threshold.

Why lead gets into tap water

Lead enters drinking water through a process called leaching — it dissolves from lead-containing plumbing materials into the water as it sits in pipes. The amount that leaches depends on:

Contact time: Water that sits in lead pipes overnight has higher lead concentrations than water that has been flushed through recently. The EPA’s “first-draw” sampling protocol captures the worst-case exposure.
Water chemistry: Slightly acidic or low-mineral water (common in some New England and Pacific Northwest supplies) is more aggressive at dissolving lead. This is what caused Flint’s catastrophic lead levels — switching to the Flint River without adding corrosion inhibitors caused lead to leach aggressively from the city’s lead service lines.
Pipe age and condition: Older lead pipes with established scale layers may actually leach less lead than pipes where the scale has been disturbed by changes in water chemistry, pressure, or physical disturbance (like construction).

The primary sources:

Lead service lines (LSLs): The pipe from the water main in the street to your meter. Roughly 9.2 million homes in the U.S. still have lead service lines. The EPA’s Lead and Copper Rule Revision (LCRR) requires utilities to replace them within 10 years.
Lead solder: Used in copper plumbing until 1986. Present in virtually every home built between roughly 1930 and 1986.
Brass fixtures: Older faucets, valves, and fittings contain brass, which has historically contained up to 8% lead. Newer “lead-free” brass must contain less than 0.25% lead under the 2014 update to the Safe Drinking Water Act.
Lead pipes within the home: Some older homes have interior lead pipes, not just the service line.

The health effects of lead exposure

Lead is a potent neurotoxin with no established safe threshold. The evidence:

Children: A 2005 pooled analysis by Lanphear et al. (PMID 16002379) of seven prospective cohorts found the steepest dose-response relationship at the lowest blood-lead levels — meaning the first few micrograms of lead per deciliter of blood cause the largest relative harm. IQ loss, attention deficits, and behavioral problems have been documented at blood lead levels once considered “acceptable.”

Cardiovascular (adults): A 2018 analysis by Lanphear et al. (PMID 29544878) using NHANES data estimated that low-level lead exposure contributes to approximately 412,000 deaths annually in the U.S. — primarily from cardiovascular disease. This figure is far higher than estimates based on acute poisoning, and has substantially changed how researchers understand lead’s public health burden.

Kidney function: Chronic low-level lead exposure is associated with impaired renal function and accelerated decline of glomerular filtration rate over decades.

Pregnancy: Lead crosses the placenta. Prenatal exposure is associated with preterm birth, reduced birth weight, and developmental delays. Pregnant women living in older housing should prioritize lead reduction.

How to identify whether your home has lead plumbing

The age test: If your home was built before 1986, assume there may be lead solder. If built before 1930, assume there may be a lead service line.

The scratch test on the service line: The service line enters your home at the water meter (usually in the basement near the foundation). If you scratch the pipe with a key and it’s silver-colored and soft, it may be lead. Lead is shiny when scratched, unlike galvanized iron (which is dull gray) or copper (which shows as orange-red).

Your utility’s service line inventory: Under the Lead and Copper Rule Revision, utilities must now provide a lead service line inventory. Contact your utility and ask specifically about the service line to your address. Some utilities have this publicly available.

The magnet test: Lead is not magnetic. If a magnet doesn’t stick to a silver-colored pipe, it could be lead (or copper, which also isn’t magnetic — use the scratch/color test to differentiate).

An at-home water test: The definitive answer. Tap Score’s first-draw lead test or the SimpleLab kit will tell you the actual lead concentration at your tap.

Testing your tap water for lead

First-draw sampling: This captures the worst case. Water that has sat in the pipes overnight will have the highest lead concentrations. The EPA protocol: don’t use water for at least 6–8 hours, then collect the first 250ml from the tap and send it for lab analysis. The lab result tells you the lead concentration at maximum stagnation.

At-home lab kits:

Tap Score Advanced City Water Test: Covers 110+ contaminants including lead, copper, and PFAS. Returns a detailed report with health context. ~$295.
SimpleLab Essential Kit: Lower cost, covers lead and copper plus basics. Good first step. ~$95.

Your utility’s Consumer Confidence Report: Available annually by law. Shows what the utility measured at the treatment plant — not at your tap. Utilities sample at high-risk homes during Lead and Copper Rule compliance monitoring, but this doesn’t reflect your specific address.

Enter your ZIP code at WaterAirAudit to see the lead risk composite for your area.

Filtering lead at the tap

What works — NSF/ANSI 53 certified filters: The NSF/ANSI 53 standard specifically tests for lead reduction. Any filter with this certification and a “lead reduction” claim on the label has been independently verified. Examples:

Under-sink carbon block filters (Culligan, Pur Plus, Brita Longlast+ with NSF 53 — note not all Brita cartridges carry this)
Reverse osmosis systems (NSF 58 also certifies for lead)
Gravity filters like the Berkey with PF-2 add-ons

What doesn’t work for lead:

Standard pitcher carbon filters (basic Brita, basic PUR) — not certified for lead reduction at most tap concentrations
Boiling water — concentrates lead rather than removing it
Water softeners — remove hardness but not lead

The most important maintenance step: Replace filter cartridges on schedule. An expired carbon filter that has reached its rated capacity can actually release previously captured lead back into the water.

The Flint water crisis made lead pipes a national conversation, but the problem predates Flint by decades and extends well beyond it. The EPA’s requirement to replace all lead service lines within 10 years is the right long-term policy — but in the meantime, testing your specific tap and filtering if needed is the most direct protection available. Check your area’s lead risk profile at WaterAirAudit and consider an at-home test if your home predates 1986.