Lead can enter drinking water as it moves through a service line, household pipes, solder, faucets, or other plumbing parts. You cannot see, taste, or smell lead dissolved in water. Testing is the only way to measure it at a particular tap.
If you are concerned about lead, start with your water utility and its service-line records. Then consider a properly collected sample analyzed by a certified laboratory. While you investigate, use cold water for drinking and cooking. A point-of-use filter certified for lead reduction can reduce exposure when it is installed, used, and replaced correctly.
The most important point is this:
A water utility's system-wide results do not tell you the lead concentration at your own faucet.
Lead levels can differ between nearby homes. They can also change within the same home depending on the plumbing, water use, sampling method, and how long water has remained in the pipes.
How Lead Gets Into Drinking Water
Lead is not usually added to water at the treatment plant. It most often enters water after treatment, when water contacts plumbing materials that contain lead.
Possible sources include:
- A lead service line between the water main and the building
- Lead solder used to join copper pipes
- Some older brass or chrome-plated brass faucets and fittings
- Galvanized pipe that is or was connected downstream from a lead pipe
- Components in a private well system or household plumbing
A lead service line is often the largest potential source when one is present. However, a home without a lead service line can still have lead at a tap because of indoor plumbing or fixtures.
The amount released depends on several factors. These include water chemistry, temperature, the condition of the plumbing, how long the water sits, and whether plumbing work or nearby construction has disturbed deposits inside a pipe.
Home age can help you judge whether older plumbing materials may be present. It cannot confirm whether your water contains lead. A newer faucet also does not prove that every upstream pipe and fitting is lead-free.
Who Should Pay Particular Attention?
It is reasonable to investigate when:
- Your utility says your service line contains lead, galvanized material requiring replacement, or an unknown material
- You live in an older home or neighborhood where lead plumbing was used
- Plumbing records are missing or incomplete
- A nearby service line, water main, or street has recently been replaced or disturbed
- A household water sample previously contained lead
- You are pregnant or an infant or young child lives in the home
- Infant formula is prepared with tap water
- A health department or healthcare professional recommends checking the water
Young children and infants are especially vulnerable to lead. Infants who drink formula mixed with contaminated water may receive more lead relative to their body size. Lead exposure can also harm adults. It is sensible to reduce every avoidable source of exposure.
Bathing and showering are generally not important routes of exposure because skin does not readily absorb lead from water. The main concern is water used for drinking, cooking, preparing beverages, brushing teeth, making ice, and mixing infant formula.
First, Check the Service Line
The service line carries water from the water main to your home. Part of it may be owned by the utility and part by the property owner. Ownership rules vary by location.
Start with these steps:
- Search your utility's service-line inventory or contact the utility directly.
- Ask what material is recorded on both the public and private sides of the line.
- Ask whether the record is confirmed or listed as unknown.
- Ask about replacement programs, financial assistance, and local instructions if lead is present.
EPA's Protect Your Tap guide can help you understand where a service line enters a home. A licensed plumber may also help when records are incomplete.
Do not identify a pipe from color alone. Paint, corrosion, lighting, and mixed plumbing materials can make visual identification unreliable. Do not scrape, sand, cut, or otherwise disturb a suspected lead pipe merely to identify it. Ask the utility or a qualified plumber how to proceed safely.
Finding a non-lead service line is useful, but it does not rule out lead-containing solder, fittings, or fixtures inside the building.
What Your Water Quality Report Can and Cannot Tell You
If you use a public water system, its annual Consumer Confidence Report can show system-level information about lead monitoring and rule compliance. See our guide on how to read your drinking water quality report.
However, lead is different from many contaminants measured at a treatment plant. It often enters water through individual service lines and building plumbing. Utilities therefore collect compliance samples from selected taps rather than from every home.
The reported value is used to assess the water system under federal rules. It is not a prediction of the lead concentration at every faucet. One neighbor's result does not establish your result either, because the two homes may have different service lines, fixtures, pipe layouts, and patterns of water use.
The action level is not a household safety boundary
As of September 2026, water systems generally continue to operate under a federal lead action level of 15 micrograms per liter, which is equivalent to 15 parts per billion. This value triggers specified actions by a public water system when its compliance sampling exceeds the rule's criteria.
EPA's 2024 Lead and Copper Rule Improvements lower the action level to 10 micrograms per liter when the main requirements take effect, expected in late 2027.
Neither number means that water below it is guaranteed to be risk-free for an individual household. EPA has set the maximum contaminant level goal for lead at zero, and public-health guidance emphasizes reducing lead exposure as much as practical.
Regulations and implementation dates can change. Check the current EPA and local guidance when you publish or substantially update this article.
When Should You Test Your Tap Water?
Testing is useful when you need information about a particular tap and plumbing configuration. It may be appropriate when the service-line material is lead or unknown, when a household includes someone at higher risk, after relevant plumbing work, or when your utility or health department recommends it.
Start by contacting your water utility. Some utilities provide sampling kits, arrange testing, or offer it at a reduced cost. If not, contact a state-certified drinking-water laboratory. EPA maintains links to state laboratory certification programs.
Avoid choosing a test only because it promises an instant answer. A consumer screening kit may be useful for a limited question, but it may not measure low concentrations accurately or tell you where the lead originates. For a decision about exposure or plumbing work, laboratory analysis with documented sampling instructions is usually more useful. Our broader guide explains what home water tests can and cannot tell you.
Sample Collection Changes What the Result Means
Lead is not always evenly distributed in household water. The concentration may change after water has sat in the plumbing, after flushing, or as water from different sections of pipe reaches the faucet.
Common sampling approaches include:
- First-draw sample: Water collected after a specified period with no water use. It can capture water that has been in contact with the faucet and nearby plumbing.
- Flushed sample: Water collected after the tap has run for a specified period. It answers a different question about the water after stagnant water has moved through.
- Sequential samples: Several containers filled in order. Under a professionally designed protocol, these may help indicate where lead is entering along the plumbing pathway.
These samples are not interchangeable. A first-draw result should not be compared casually with a flushed result. Sequential sampling also requires careful planning and interpretation.
Use the bottles supplied or approved by the laboratory. Follow its instructions exactly. Do not remove the aerator, flush the tap, clean the faucet, or use water during the stagnation period unless the written protocol tells you to do so. Small changes can affect the result.
Before collecting anything, ask the laboratory:
- Which faucet should be sampled?
- How long should water remain unused?
- Should the aerator stay in place?
- What volume should be collected?
- Is preservation required?
- How soon must the sample reach the laboratory?
- What detection limit will be reported?
- Will the result include units and an explanation of the sampling method?
Write down the faucet, date, time, stagnation period, recent plumbing work, filter status, and any departure from the instructions. That context makes the result more useful.
How to Interpret a Lead Test Result
First, confirm the unit. Laboratories commonly report lead in micrograms per liter (µg/L) or parts per billion (ppb). In water, these are numerically equivalent for practical interpretation: 10 µg/L is approximately 10 ppb.
Then confirm how the sample was collected. A number without the sampling method can be misleading.
If lead is detected:
- Contact the laboratory, utility, or local health department for interpretation.
- Begin or continue exposure-reduction steps.
- Review the service-line record and possible indoor sources.
- Ask whether follow-up sampling would help distinguish among the faucet, indoor plumbing, and service line.
- Discuss permanent correction with the responsible utility, property owner, and a qualified plumber.
A result reported as “not detected” does not necessarily mean absolute zero. It means lead was not found above the laboratory's reporting or detection limit in that sample. It also describes one faucet under one set of conditions. If the sampling method did not match your question, or a known lead source remains, ask whether additional testing is warranted.
What to Do While You Investigate
The following steps can reduce exposure. They do not remove the source.
Use cold tap water
Use water from the cold tap for drinking, cooking, making ice, and preparing infant formula. Hot water can dissolve lead more readily. If you need hot water, start with cold tap water and heat it separately.
Boiling does not remove lead. As water evaporates, boiling may leave lead behind rather than make the water safer.
Flush according to local guidance
Water that has remained in contact with plumbing may contain more lead. Activities such as showering, washing laundry, or running a faucet can move stagnant water through the system.
There is no single flushing time that is correct for every home. The required time depends on the plumbing layout, service-line length, and source of lead. Ask your utility or health department for local instructions.
Flushing is a temporary exposure-control measure. It wastes water, may not reliably address particulate lead, and does not replace lead-containing plumbing.
Clean the faucet aerator
Lead-containing particles and other debris can collect in the screen at the end of a faucet. Follow local guidance for removing and cleaning the aerator. Take care after construction or plumbing work, which can disturb deposits.
Use a filter certified for lead reduction
Choose a point-of-use filter whose exact model and cartridge are independently certified to reduce lead. Look for a specific lead-reduction claim under NSF/ANSI 53 for a filtration device or NSF/ANSI 58 for a reverse-osmosis system. NSF/ANSI 42 alone generally addresses aesthetic effects such as taste and odor; it is not, by itself, a lead-reduction claim.
Check the model in an independent certification directory. Do not rely only on a logo, a marketplace listing, or the words “tested to NSF standards.” Certification must cover the exact product and the contaminant you want to reduce.
Use only cold water through the filter unless the manufacturer says otherwise. Install it correctly. Replace the cartridge on schedule, or earlier if the instructions require it. An expired or incorrectly installed cartridge may not perform as certified.
Our guide on choosing a water filter explains how to match a contaminant, treatment method, and certification claim.
If a public agency distributes filters after a lead advisory or service-line disturbance, follow that agency's instructions. It may recommend flushing, filter use, and cartridge replacement together.
Consider an alternative water source when advised
Your utility or health department may recommend certified bottled water for drinking, cooking, or preparing infant formula in some situations. Follow local instructions, especially when a pregnant person, infant, or young child may be exposed.
Do not assume all bottled water is automatically free of lead. Use a product certified by an independent organization when an alternative source is recommended.
A Filter Controls Exposure, but It Does Not Fix the Plumbing
A certified filter can be an effective barrier at the faucet it serves. It cannot remove a lead service line or repair a lead-containing fixture. It also does not protect unfiltered outlets.
The long-term solution is to identify and remove the source where feasible. This may involve:
- Full replacement of a lead service line
- Replacement of lead-containing fixtures, solder, or indoor plumbing
- Utility corrosion-control treatment
- Follow-up flushing and testing after plumbing work
Avoid partial service-line replacement when a full replacement is available. Disturbing or leaving part of a lead line in place can complicate exposure control. Ask the utility who owns each section, how replacement will be completed, what precautions are required during and after the work, and whether testing or filters will be provided.
Never attempt to remove a service line yourself. Use the utility's program and qualified professionals.
If You Rent Your Home
Contact both the water utility and the property owner or manager. Ask for the service-line classification, any household test results, and records of plumbing or fixture replacement.
Keep written copies of notices and laboratory reports. Local landlord duties and disclosure rules vary, so contact the health department, housing department, or a local tenant-support organization if the response is unclear.
You can often use a certified faucet-mounted or pitcher filter without changing permanent plumbing. Confirm that it is certified for lead reduction and compatible with your faucet or intended use.
What About a Private Well?
Private wells are not regulated like public water systems under the federal Safe Drinking Water Act. Lead may still enter well water from the pump, well components, pipes, solder, fittings, or household fixtures. Corrosive groundwater can increase the release of metals from these materials.
A standard annual well test may not automatically include lead. Ask your local health department, state well program, or a certified drinking-water laboratory whether lead and corrosivity indicators should be included. Follow a sampling plan designed for your well and plumbing.
If lead is found, investigate the source before choosing treatment. Replacing a component may be more appropriate than treating all household water. Treatment selection should be based on the laboratory result, water chemistry, flow needs, and an independently verified contaminant-reduction claim.
What Not to Do
- Do not judge lead risk by the water's color, taste, or odor.
- Do not treat the utility's action level as a personal safety threshold.
- Do not assume a neighbor's test represents your faucet.
- Do not boil water to remove lead.
- Do not use hot tap water for drinking, cooking, or infant formula.
- Do not buy a filter based only on marketing language or a generic standards logo.
- Do not continue using a cartridge beyond its rated life.
- Do not disturb a suspected lead pipe to identify it.
- Do not use one sample to diagnose the exact source unless the sampling design supports that conclusion.
- Do not let a temporary filter delay removal of a confirmed lead source.
The Practical Next Step
If you do only one thing today, contact your water utility and ask what material is recorded for both sides of your service line.
If the answer is lead, galvanized requiring replacement, or unknown, ask about testing and replacement programs. Use cold water for consumption. Follow local flushing guidance. If you use a filter, verify that the exact model is independently certified for lead reduction and replace it on time.
A water-quality report describes the public system. A properly collected household sample describes one tap under defined conditions. Service-line and plumbing records help explain where lead may enter. You need these pieces together to make a sound decision.
References
- U.S. Environmental Protection Agency. Basic Information about Lead in Drinking Water. Updated June 18, 2026.
- U.S. Environmental Protection Agency. Lead and Copper Rule Improvements.
- U.S. Environmental Protection Agency. LCRI Questions and Answers. Updated March 11, 2026.
- U.S. Environmental Protection Agency. Protect Your Tap: A Quick Check for Lead. Updated May 4, 2026.
- U.S. Environmental Protection Agency. Contact Information for Certification Programs and Certified Laboratories for Drinking Water.
- Centers for Disease Control and Prevention. About Lead in Drinking Water. Updated August 20, 2025.
- Centers for Disease Control and Prevention. About Choosing Home Water Filters.
- NSF. Certified Product Listings for Lead Reduction.
- NSF. NSF Standards for Water Treatment Systems.