How do I test my water for lead?
Lead in water has a health goal of zero, and the only way to learn your tap's number is a first-draw sample read by a certified lab. Let the water sit unused at least six hours, collect the first draw without flushing, and send it to a state-certified laboratory. EPA puts the cost at 20 to 100 dollars. Ask your utility first; lead enters from your own plumbing.
You cannot see, taste, or smell lead in water
Lead solder was legal on drinking water pipes until 1986, and brass sold as lead-free could carry up to 8 percent lead in its wetted surfaces until January 4, 2014. Water picks lead up from those surfaces silently. In EPA's words, since you cannot see, taste, or smell lead dissolved in water, testing is the only sure way of telling whether harmful quantities are in your drinking water. Your senses are not a screening method here, at any concentration a house ever produces.
The other instinctive check fails for a subtler reason. Your utility's annual report is real data, but it describes the treated supply, and treated water leaves a compliant plant carrying little detectable lead. The metal enters afterward, in the last stretch of plumbing the utility never samples: the service line where some older systems still have lead, the pre-1986 solder joints, the pre-2014 brass in faucets and valves. A system in full compliance and a tap with a lead problem can be the same address.
That combination is what makes this test different from most water questions. Nobody else's number transfers to your kitchen, because each faucet sits at the end of its own run of metal.
Morning water or flushed water: which do you sample?
Six hours of stagnation is what makes a lead sample mean something. EPA's homeowner sampling instructions, revised September 2024, say to collect from a kitchen or bathroom tap that has not been used for at least six hours, at first draw, and they name the workable windows: early morning, or the evening return from work.
The same instructions carry a warning: do not flush the line before the stagnation period. The point of the sitting time is that water resting overnight against your solder, brass, and service line accumulates whatever those surfaces shed. Run the tap first and you are sampling the utility's water, which was already near zero for lead when it reached your meter.
The two samples answer different questions from the same faucet. First-draw asks what the worst case at your tap is, which is also what your household pours first thing in the morning. A flushed sample asks what arrives from the main, and it can come back far lower in the same house on the same day. For deciding whether your plumbing sheds lead, first-draw is the test, and it is the one EPA's own compliance sampling is built on.
The smaller rules matter because the number is only as good as the collection. Sample a cold tap in regular use for drinking. Do not sample through a water softener or a point-of-use filter, since you would be grading the filter, not the plumbing. Leave the aerator on the faucet. Fill the laboratory's bottle with the very first water out, and follow its return timing.
Ask your utility first, then a state-certified lab
Contact your water utility to have your water tested: that is EPA's own first instruction for anyone worried about lead, and it is worth taking literally. Utilities run tap sampling programs under the federal Lead and Copper Rule, and yours may sample your home or already know what its program has found nearby. Ask one more question while you have them, because EPA's testing FAQ says suppliers may hold the answer: whether the service connector feeding your home or area is made of lead.
The independent route runs through a state-certified drinking water laboratory. EPA is explicit that it cannot test residential water on request, and equally explicit about the alternative: the list of certified labs held by your state or local drinking water authority, also collected on EPA's website. EPA puts the cost of testing between 20 and 100 dollars, and the lab supplies the bottle and the collection instructions from the previous section.
Which leaves the strip kits sold as lead tests. A color strip renders a yes or no against whatever threshold it was built to, and for lead that is the wrong shape of answer. The health goal is zero and the range that matters is single-digit ppb, parts per billion, so the useful result is an actual concentration you can grade against zero. A certified lab reports that number, using the same analytical methods utilities use for compliance work. A strip reading of safe means the water sits below the strip's line, wherever that line is, not that your water is at zero.
Zero, 10, and 15 ppb: which number is the safety line?
Zero is the only number on a lead report that describes health. EPA's term for it is the maximum contaminant level goal, or MCLG, the non-enforceable level based solely on health risk, and EPA set lead's at zero because lead is harmful even at low exposure. On children, EPA and CDC hold a joint position stated in one sentence: there is no known safe level of lead in a child's blood.
The 15 ppb figure you will see quoted is a different kind of number doing a different job. It is the action level, a trigger for water systems: when more than 10 percent of a system's tap samples exceed 15 parts per billion, the system must act, with corrosion control and public education among the requirements. That sentence measures a distribution of samples across many houses, not your house. A system can clear its trigger while your tap does not, and a tap at 14 ppb has passed nothing except a threshold that was never a safety line.
The trigger is also moving: the 2024 Lead and Copper Rule Improvements lower the action level to 10 micrograms per liter, the same quantity as 10 ppb, to push more systems into corrosion control sooner, with the change taking effect by November 2027. Until then 15 remains the enforceable level.
So grade your result against the right line. A reading of 8 ppb clears both action levels and still sits eight above the health goal, and the gap between those framings gets blurred, sometimes carelessly, sometimes by people with something to sell in either direction. The accurate reading is narrower than both pitches: any detection means your plumbing is shedding lead, the size of the number sets the urgency, and the target after a fix is as close to zero as the lab can measure.
After a detection: a certified filter now, new fixtures for good
A lead detection at any level is worth acting on, because the goal is zero and the interim fix is small. A point-of-use filter certified to NSF/ANSI 53 for lead, NSF/ANSI being the independent standard drinking water filters are tested against, is certified to cut dissolved lead by at least 99 percent from standardized challenge water. Reverse osmosis certified to NSF/ANSI 58 covers it with margin. Either one at the kitchen tap, where drinking and cooking water is poured, handles the exposure that matters while you deal with the source. The certification for lead specifically is the load-bearing part: a generic carbon pitcher without that claim has not been tested for this.
The permanent answer is subtraction. In a post-1986 home, detected lead usually traces to brass, the faucets, valves, and supply stops made before the 2014 lead-free standard, and replacing the few fixtures that serve drinking water with components meeting NSF/ANSI 372, the 0.25 percent lead-free standard, removes the source with no cartridge to remember. Homes plumbed before 1986 may also carry leaded solder on copper joints, which is a diagnose-first problem rather than a swap.
Two habits bridge the gap between result and fix. Do not use first-draw water for infant formula or for cooking; run the tap first, since overnight water carries the day's highest lead. And when the fix is in, retest with the same first-draw method, because the only proof a lead problem is gone is the test that found it.
Where do I start?
- Ask your water utility for a tap test, and ask whether the service line to your home is lead.
- If you go independent, order the sample bottle from a state-certified drinking water laboratory, not a strip kit.
- Collect first-draw water after the tap has sat unused at least six hours. Do not flush the line first, leave the aerator on, and skip any tap that runs through a softener or filter.
- Grade the result against the health goal of zero, not the 15 ppb action level.
- Until you have a number, do not use first-draw water for infant formula or cooking.
What actually works?
How do the options compare?
Common questions
Are home lead test strips accurate?
Not at the levels that decide anything. The lead question lives in single-digit parts per billion against a health goal of zero, and a strip reports a color band against a built-in threshold, not a concentration. A strip can flag a badly contaminated tap; it cannot rule lead out below its own line. EPA's guidance for anyone who wants water tested is a state-certified laboratory, which reports the actual number you can grade against zero.
Does boiling water remove lead?
No, and it moves the number the wrong way. EPA's emergency disinfection guidance is explicit that boiling kills disease-causing microorganisms but will not destroy heavy metals, salts, or most other chemicals. Lead is a heavy metal: it stays behind while water leaves as steam, so the concentration in the pot can only rise. Boiling answers a bacterial advisory. For lead, the answers are a certified filter and removing the source.
My house is new. Do I still need to test for lead?
Lower risk is the right answer, not zero. Lead solder was banned from drinking water plumbing in 1986, but brass sold as lead-free could legally carry up to 8 percent lead in wetted surfaces until January 4, 2014. Fixtures made since then meet the 0.25 percent lead-free standard, NSF/ANSI 372, a far smaller source rather than the absence of one. One first-draw test settles the question for your specific taps.
Can I just install a filter instead of testing?
A filter without a test is a guess three times over. You do not know whether your water carries lead, whether the unit you bought is certified for it, or whether it worked, since the only proof is a follow-up test. Testing first can also change the fix entirely: a result traced to one or two pre-2014 brass fixtures is often solved permanently by replacing them, with nothing left to maintain.
Sources cited on this page
Every number on this guide page traces to one of the 11 sources below: 8 government or regulatory.
Government & regulatory
- US EPA, Basic Information about Lead in Drinking Water (you cannot see, taste, or smell lead dissolved in water; MCLG of zero, no safe level of exposure; the 15 ppb action level triggered when more than 10 percent of tap samples exceed it; testing costs between $20 and $100; EPA and CDC agree there is no known safe level of lead in a child's blood)
- US EPA, Instructions for Homeowners: Lead and Copper Tap Sample Collection, 09/2024 (first-draw sample from a tap unused at least 6 hours, morning or evening; do not flush before the stagnation period; cold tap in regular drinking use, no softener or point-of-use filter, aerator left on)
- US EPA, Contact Information for Certification Programs and Certified Laboratories for Drinking Water (use a state-certified drinking water laboratory; EPA does not test residential water on request)
- US EPA, Can I get my water tested for lead? (certified-lab lists via the state or local drinking water authority; contact your water supplier, which may know whether the service connector in your home or area is made of lead)
- US EPA, LCRI Questions and Answers (the 2024 Lead and Copper Rule Improvements lower the lead action level to 10 µg/L; the 0.015 mg/L trigger applies in the interim; contact your water utility to have your water tested)
- US EPA, Lead and Copper Rule Improvements (final rule, 2024; action level drops to 10 by November 2027)
- US CDC, CDC Updates Blood Lead Reference Value for Children, October 28, 2021 (no safe blood lead level in children has been identified)
- US EPA, Emergency Disinfection of Drinking Water (boiling or disinfection will not destroy other contaminants, such as heavy metals, salts, and most other chemicals)
Institutional & standards
- NSF/ANSI 53: Drinking Water Treatment Units, Health Effects (lead reduction certification)
- NSF/ANSI 58: Reverse Osmosis Drinking Water Treatment Systems
- NSF/ANSI 372: Drinking Water System Components, Lead Content (0.25% wetted-surface lead-free standard)
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