Lead in drinking water has no safe exposure threshold. There is no level below which the CDC, EPA, or American Academy of Pediatrics considers lead consumption acceptable, particularly for children under six. And yet, in 2026, somewhere between 6 and 10 million US households still receive water through some portion of legacy lead infrastructure.
The frustrating reality of lead is that it almost never comes from your water source — your utility’s water leaves the treatment plant clean. Lead enters the water during the last few feet of the journey: through lead service lines, lead solder in copper plumbing installed before 1986, brass fixtures that contain trace lead, and galvanized pipes that have absorbed lead over decades.
This means two things. First, your city’s water grade can be excellent while your specific home still has lead in the tap. Second, individual households can protect themselves regardless of what their utility is doing.
Where lead in tap water actually comes from
Lead service lines — the pipe running from the water main to your house. Most were installed before 1950, though some cities allowed them through the 1980s. These are the largest single source of lead in US drinking water and the target of the federal Lead and Copper Rule Revisions, which now require utilities to replace them on accelerated timelines.
Lead solder — used to join copper pipes inside homes built before 1986. The federal lead solder ban took effect that year, so any home built or significantly re-plumbed after 1986 is generally safe from this specific source.
Brass fixtures — faucets and valves manufactured before 2014 could legally contain up to 8% lead. Even “lead-free” fixtures after 2014 can contain up to 0.25% lead.
Galvanized iron pipes — these don’t contain lead originally, but they accumulate lead over time when downstream of any lead source. Replacing the lead service line doesn’t eliminate the problem if galvanized pipes downstream are saturated with lead.
How to find out if you have a lead problem
In order of cost and accuracy:
Free: check your city’s lead service line inventory
The 2024 federal Lead and Copper Rule Revisions require every utility to publish a service line inventory — a map showing whether each address has lead, galvanized, or non-lead service lines. Most utilities now publish these maps publicly.
Look on your utility’s website for “Service Line Inventory” or “Lead Service Line Map.” Enter your address. The result will be one of: - Non-lead — your service line is copper, plastic, or another non-lead material. Good news, but it doesn’t rule out lead from your home’s interior plumbing. - Lead — your service line contains lead. High priority for replacement. - Galvanized requiring replacement — galvanized pipe downstream of a known or suspected lead source. - Unknown — the utility hasn’t been able to identify the material. Treat as suspect until verified.
Free: review your home’s age
If your home was built before 1950, assume a lead service line until proven otherwise. If your home was built 1950-1986, assume lead solder is present in some plumbing connections. If after 1986, you’re substantially safer but not immune (brass fixtures, possible lead in repair work).
$30-100: order a water test
A mail-in lead test from an EPA-certified lab is the only way to know for sure what’s in your tap water. Tests are inexpensive and accurate. Tap Score (offered by SimpleLab) and similar services run $30-50 for a basic lead test, more for comprehensive panels.
Important: the test result depends heavily on how you sample. First-draw water (the water that’s been sitting in your pipes overnight) typically has the highest lead concentration. Flushed-line water (after running the tap for several minutes) typically has much less. Both numbers are useful. Follow the kit’s sampling instructions exactly.
What lead exposure actually does
The health effects of lead exposure are well-established and serious, particularly for children:
In children under six, lead exposure at levels long considered “low” (5-10 micrograms per deciliter of blood) is associated with measurable IQ decline, attention deficits, and behavioral effects. The effects are permanent — lead damage does not reverse when exposure stops.
In adults, chronic lead exposure is associated with cardiovascular disease, kidney disease, and reproductive effects. Pregnant residents pass lead to the fetus, and lead exposure in utero produces the same developmental harms as direct exposure to a child.
The risk is dose-dependent — a brief exposure to slightly elevated lead is very different from years of consistent exposure. But there is no exposure level that is considered safe.
Filters that actually remove lead
The specific certification to look for is NSF/ANSI 53 with a claim for lead reduction. This is the only third-party certification that confirms a filter has been tested specifically against lead and demonstrated significant removal across its full claimed lifespan.
A filter that says it’s “NSF certified” without specifying which standard, or that’s only NSF 42 certified (taste and odor only), or that claims lead removal without third-party verification, should not be trusted for lead protection.
Top picks for lead removal
Clearly Filtered Pitcher — NSF/ANSI 53 certified for lead reduction. Pitcher format works for renters and households not ready for permanent installation. Replacement cartridges last roughly 4 months. $80-95 for the pitcher.
Aquasana AQ-5300 Under-Sink — NSF/ANSI 53 certified for lead. Three-stage carbon block design. Long filter life (6 months). Dedicated under-sink installation. $180-240.
AquaTru Countertop Reverse Osmosis — NSF/ANSI 58 certified, which is more comprehensive than NSF 53 alone. Reverse osmosis removes lead through physical exclusion in the membrane rather than chemical adsorption, making it less prone to breakthrough as the filter ages. Recommended for the highest-risk situations (older homes with documented lead service lines, households with young children or pregnant residents). $449-599.
What does NOT work for lead
- Standard pitcher filters not specifically NSF 53 certified for lead
- Most refrigerator filters (check the spec sheet — some are, most aren’t)
- Boiling water (concentrates lead rather than removing it)
- Most “alkaline” or “hydrogen” filters
- Whole-house carbon filters not certified for lead at the tap
Immediate steps if you suspect lead
Before any filtering, two free behavioral steps reduce exposure significantly:
Flush your pipes in the morning. Lead concentrations are highest in water that has sat in plumbing overnight. Run cold water for 30 seconds to 2 minutes before drinking or filling a pot for cooking. This is most impactful when water has sat unused for more than 6 hours.
Use cold water only for drinking and cooking. Hot water dissolves lead from pipes faster than cold water does. Never use hot tap water for baby formula, cooking pasta, or any food preparation. Heat cold water on the stove instead.
These steps are not substitutes for filtration if you have known lead sources, but they’re meaningful incremental protection.
Long-term: get the lead out
Behavioral mitigation and filtration are the short-term answers. The long-term answer is removing the lead source entirely.
If you have a lead service line, your utility is now legally required to replace it within 10 years under the 2024 federal rules. Many cities are doing it faster. Many are offering programs that cover the cost on the utility side (the publicly-owned portion from the main to the property line) while the homeowner is responsible for the private portion (property line to the house). Several cities — including Newark and Pittsburgh — have funded full replacements at no cost to homeowners.
Contact your utility’s water quality officer (listed on every utility’s TapWaterSafety page) to find out where you are in the replacement queue and what financial assistance is available.
For interior plumbing with lead solder, replacement is more expensive and rarely cost-effective unless you’re already remodeling. Filtration is the practical permanent solution for those homes.
A note on testing your child’s blood lead level
If you’ve discovered a lead exposure source in your home, especially if you have young children, ask your pediatrician for a blood lead test. Most insurance covers it, and most pediatricians will order it on request. The CDC recommends elevated-level testing for any child living in a home built before 1978 or in an area with known lead issues.
A blood lead level above 3.5 mcg/dL is considered elevated and warrants intervention. Lower levels are not “safe” — there’s no safe level — but are not typically treated medically.
Bottom line
Lead is one of the most serious water contaminants because of its potency, particularly for children, and one of the most household-controllable because the exposure happens at the home plumbing level. Test if you have any reason to suspect, filter through an NSF/ANSI 53 certified system, and pursue service-line replacement if available.
Looking for your specific utility’s lead status and a filter recommendation matched to your water? Find your water system by ZIP code.