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For grandparents · before the next visit

If your grandkids visit your house this weekend, please check these three things first.

Lead exposure does about five times more damage to a two-year-old than it does to a grandparent. Most American homes built before 1978 have leaded paint somewhere. Most homes built before 1986 have lead solder in the plumbing. The good news: three checks will identify most of the household exposure in about an afternoon.

The research

What the science says about lead and your grandchildren

This is not opinion. These numbers come from NHANES, the largest ongoing health survey in the United States, plus peer-reviewed studies with combined sample sizes over 500,000 people.

0
million IQ points erased from the US population by leaded gasoline (McFarland 2022, PNAS)
0
times more likely to be diagnosed with ADHD at the highest blood lead levels (Braun 2006, n=8,413)
5x
the CDC safe reference level: what the average US child had in their blood in 1970 from leaded gasoline
Lead in US children's blood, 1925-2020
Geometric mean µg/dL for US children 1-5 (NHANES CDC) and tetraethyl lead added to US gasoline (EPA). Press play to watch 95 years of data draw in.
1925
Lead exposure and ADHD diagnosis odds
Braun et al. 2006, NHANES. Adjusted for income, parental education, home environment. The effect is dose-dependent.
Low blood lead (<2 µg/dL)1.0x baseline
Moderate (2-5 µg/dL)2.3x
High blood lead (top quintile >5 µg/dL)4.1x
Source: Braun JM et al., Environ Health Perspect 2006. Mendelian randomization confirmation: Nigg JT et al., Psychol Sci 2016.

Why this matters more for the grandchildren than it ever did for you.

Adults absorb roughly 5 to 10 percent of ingested lead. Children absorb 40 to 50 percent. Same dose, very different impact.

If you're 65 or older, you grew up with leaded gasoline, leaded paint, leaded solder in the cans of soup you ate as a kid, leaded ceramic dishes that nobody had heard of as a problem yet. You have a body load of lead that is mostly in your bones at this point, slowly releasing into your blood as you age. That's a real concern for your own cognitive and cardiovascular health, and we'll get to that.

But the children visiting your house are running a very different metabolic process. The CDC has been clear about this for two decades: there is no safe blood lead level for a child. A two-year-old absorbs lead from food, dust, and water at roughly five to ten times the rate that you absorb it. Their developing brain is in the window where the synaptic wiring is still being laid down. Lead during this window doesn't move through the system, it interferes with the wiring itself.

This isn't theoretical. The biggest cohort study on lead and IQ pooled data from over 1,300 children and found measurable IQ reductions at blood lead levels far below what was considered safe in the 1970s. Lanphear and colleagues, published in Environmental Health Perspectives, 2005. The dose-response curve is steepest at the lowest levels, meaning even small reductions in childhood lead exposure produce meaningful protection.

Your grandkids visiting your house gets a lot of dose-time at your house. So the practical question is: where in your house is the lead, and how do you cut it before they come over.

"There is no safe blood lead level for children."

U.S. Centers for Disease Control and Prevention, CDC Lead Prevention.

Three checks. One afternoon.

In rough order of how often these are the actual problem in a US home built before 1978.

1

The painted surfaces. Especially window sills, door jambs, and friction surfaces.

If your home was built before 1978, it almost certainly had leaded paint applied at some point. The federal residential ban took effect that year. Homes painted after 1978 may have been painted over old leaded layers that are still underneath. The places that matter most for kids are: window sills (where dust collects from raising and lowering the sash), door jambs (friction between door and frame creates dust), and baseboards near the floor (where toddlers crawl).

You can check the paint with a $50 fluorescence drip test kit at home (FluoroSpec, the kit we make, drops on, glows under UV in 30 seconds), or with a state-licensed lead inspector for a more formal report. The fastest free check: look for chipping, peeling, or flaking paint anywhere a child can reach. If you see any, that area gets vacuumed (HEPA vacuum, not a regular one, which spreads dust) and stays off-limits to kids until you can address it.

CPSC limit on lead in paint: 90 ppm. Pre-1978 paint commonly exceeds 5,000 ppm.

2

The dishes the kids will eat off of.

Painted decoration on ceramic dishes is the second-most-common household lead source for kids who don't have access to flaking paint. The painted decoration on a vintage dish leaches lead into food when the food is acidic (juice, tomato sauce, fruit) or hot. The clear glass and uncolored porcelain in your cabinet is mostly fine. The painted patterns on imported, vintage, hand-me-down, or decorative pieces are the ones to put away when grandkids visit, even if just for a year or two until they're not eating off them anymore.

Quick rule of thumb: any dish with painted decoration on the surface that touches food, made before 1980, imported from countries with no FDA enforcement, or marked "decorative use only" , those go to display, not to dinner. A 30-second drip test on a single dish (the painted side, not the white) tells you in real time whether to keep it in rotation. Our database has 5,818 dishes already scanned with results.

FDA cup glaze limit: 0.5 mg/L. FDA plate glaze limit: 2.0 mg/L. Acetic acid extraction.

3

The first liter of water out of the tap in the morning.

If your house was built before 1986, the federal ban on lead solder in residential plumbing hadn't passed yet. Most pre-1986 homes have at least one lead solder joint somewhere in the supply line. The way lead gets into the water is overnight: the water sits in the line, lead leaches in, you wake up and pour a glass for your grandchild. The first liter out of that tap is the worst.

Three things help, all free or cheap:

  1. Run cold water for 30 to 60 seconds before drinking, every morning. The standing water flushes out.
  2. Use cold water for cooking, never hot. Hot water dissolves more lead from the pipes.
  3. Install an NSF/ANSI 53 certified lead-removal filter at the kitchen sink. About $30 for the unit, $30 to $50 for replacement cartridges every 6 months.

The EPA action level is 15 ppb of lead in drinking water. The action level is not a safety threshold; it is the trigger for utility-level remediation. The recommended target for a child's drinking water is far below 15 ppb, ideally nondetect.

References: CDC: Health Effects of Lead Exposure; EPA: Basic Information About Lead in Drinking Water; AAP: Prevention of Childhood Lead Toxicity (2016); Lanphear BP et al., Environmental Health Perspectives 2005, 113(7):894-9.

Two more if you have time after those three.

The yard, within ten feet of the house. If the exterior of your home was painted before 1978, paint flakes have been falling and weathering into the soil for decades. Pre-1996 leaded gasoline also settled into the topsoil within a few feet of any road or driveway. The dripline , the strip of soil right against the foundation , is the highest-stake outdoor lead zone for kids who play in dirt. A simple soil test from your county extension office (often free or under $20) gives you a number. If it's elevated, lay sod or mulch over the dripline before kids play there.

The pantry spices. Imported turmeric, paprika, chili powder, and cumin from countries with looser heavy-metals limits than the US are documented to test high for lead. Chemical adulteration with lead chromate (a yellow pigment that brightens turmeric) is a known practice. Replacing pre-1996 spices with brands that publish heavy-metals testing is a quiet, easy upgrade.

Why we built the FluoroSpec kit.

I'm Eric Ritter. I have a kid. After my own house tested positive in three of the four places listed above, I started looking for a way to test more, faster, cheaper. The standard XRF equipment that lead inspectors use costs $30,000+. The state-licensed inspection costs $400 to $800 per house. Neither is in reach of most grandparents who just want to know whether the dishes they bought in 1973 are still safe to feed a two-year-old off of.

So we built FluoroSpec. It's a fluorescence-spectroscopy reagent in a small drip-tip bottle. You drop it on a painted surface, dish, or piece of decoration. If lead is present, it glows green under UV light in about 30 seconds. The kit retails at $50 to $75 depending on size. It's the at-home alternative to a $30,000 XRF gun, with the same chemistry approach but for ppm-scale lead pigments rather than sub-ppb dissolved lead. It's the right tool for paint, dishes, toys, and ceramics. (For sub-ppb food testing, lab ICP-MS is the tool, and we run a $100 crowdfunded retest model called the Lead Lottery if you want a specific food retested.)

We didn't invent the science. We made the science cheap enough that a grandparent can run a quick check before the grandkids come over.

Run the three checks before the next visit.

FluoroSpec drip kits ship same-week. The ZIP screener on our site gives you a quick read on your local pre-1978 housing density, soil lead history, and water-system risk. Both are linked below.

FluoroSpec test kit ($50-$75) → Check my ZIP →
If lead is also an issue for you (it probably is).

Most adults over 65 in the US carry a lifetime body burden of lead in their bones.

Lead released during age-related bone resorption is associated with elevated blood pressure (NHANES) and accelerated cognitive decline (Normative Aging Study). The same checks that protect grandkids cut your own ongoing exposure too. Replacing the pre-1996 spice rack, filtering the kitchen tap, putting the painted dishes on the display shelf , these all reduce the dose you keep adding to the bone reservoir.

Free tools we maintain.

"Lead is bad" , primary sources.

Find it. Deal with it. Don't let lead weigh you down.