How to Find Out if You Have a Lead Service Line

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The service line is the single pipe that carries water from the street main into your home, and if it is made of lead, it sits upstream of every tap you drink from. The good news is that you can often identify the material yourself in about ten minutes, with two tools you already own: a coin or key and a refrigerator magnet. This guide walks through the safe self-checks, what each pipe material looks and behaves like, and the public records that can tell you the answer without anyone lifting a wrench.

This post is about identification only: figuring out what your service line is made of. For what lead in water does to health and how to reduce exposure once you suspect lead, see our guide on whether old lead pipes are a health risk (153).

Find Where Your Service Line Enters the House

Your service line almost always enters at the lowest point of the home and ends at the water meter or main shutoff valve. Start there. In a house with a basement, look along the foundation wall, usually on the street-facing side, for a pipe that comes up through the floor or wall and connects to the meter. In a home on a slab or with a crawlspace, the meter is often in an outdoor box near the curb or in an attached utility area, and the indoor line may surface in a garage, a closet, or under the kitchen.

The piece you want to inspect is the first foot or two of pipe right where it enters, before any valves, fittings, or branch lines. That entry section is the service line itself. Pipes that branch off deeper into the house are interior plumbing and can be a different material, so judging by them can mislead you.

Bring a flashlight and wipe the pipe with a rag if it is dusty or painted with a thin coat. You are looking at the bare metal or plastic surface. Do not scrape hard, sand, or cut into the pipe. You only need a small clean spot to test, and aggressive scraping on an old line is both unnecessary and risky for a reason covered further down.

The Scratch-and-Magnet Test: Telling Lead From Copper, Galvanized, and Plastic

Two quick tests separate the four common service-line materials: scratch the pipe with a coin or key, then hold a magnet to it. According to EPA guidance, lead scratches to a shiny silver color and is not magnetic, which is the combination that flags a likely lead line.

Here is how each material responds:

  • Lead. Dull gray and slightly rounded or lumpy at the joints. Scratch it and the bright metal underneath turns a shiny silver, almost like a pencil mark in reverse. The surface is soft, so the coin bites easily. A magnet does not stick.
  • Copper. The color of a penny when clean, sometimes darkened to brown or green with age. A scratch reveals a yellow-orange or bright copper tone, not silver. A magnet does not stick.
  • Galvanized steel. Dull silver-gray and often rougher, with visible threaded fittings. It can scratch to a grayish shade that looks lead-like, which is exactly why the magnet matters: galvanized steel is magnetic, so a magnet sticks firmly. That single difference separates it from lead.
  • Plastic. PEX, PVC, CPVC, or polyethylene lines are usually white, black, blue, or cream colored, clearly not metal, and a magnet does nothing. These are not lead.

So the decision comes down to two readings. Shiny-silver scratch plus no magnet points to lead. Silver-gray scratch plus a magnet that sticks points to galvanized steel. A yellow-orange scratch is copper. Anything obviously plastic is in the clear. For why galvanized pipe on its own is sometimes a concern apart from lead, see our guide on whether galvanized steel pipes are a problem (103).

Reading the Solder and Pipe Color for Clues

Beyond the scratch and magnet, the shape and joints of the entry pipe give you supporting clues. A genuine lead service line tends to look distinctly different from rigid copper or threaded steel.

Lead pipe is comparatively soft and was often bent into gentle curves rather than joined with sharp elbow fittings, so a line that sweeps or bows where a copper line would have a hard 90-degree fitting is a hint. The joints where an old lead line meets other plumbing were frequently made with a bulged, hand-wiped solder connection, a rounded gray lump of joining metal that looks melted on rather than crimped or threaded. A swollen, blob-like joint is a feature worth noting.

Color helps confirm the scratch test. Untouched lead carries a flat, chalky gray with no shine, and the metal feels dense and heavy for its size. Treat all of these as supporting signals, not proof. Color and shape vary with age, paint, and past repairs, which is why the scratch-and-magnet result is the primary read and the visual cues back it up. None of these checks confirm whether lead is actually reaching your tap water. Confirming the water itself requires a certified laboratory test, which is its own process covered in our guide on how to tell what is in your home’s water (146).

Your Utility’s Service-Line Inventory and the New Public Records

You may not have to inspect anything, because your water utility was required to publish what it knows. Under the EPA’s Lead and Copper Rule, every public water system had to complete an initial service line inventory by October 16, 2024, classifying each line as lead, galvanized requiring replacement, non-lead, or unknown. Systems serving more than 50,000 people must make that inventory publicly accessible online, and many smaller systems posted searchable maps as well.

To use it, search your water provider’s website for “service line inventory” or “lead service line map,” or call the utility directly and ask for the recorded material of the line at your address. Utilities were also required to notify people served by a line classified as lead, galvanized requiring replacement, or unknown, so a letter on this topic may already have reached you.

Two things to keep in mind when you read the record. First, many lines are still listed as “unknown,” which means the utility has no documentation and your own scratch-and-magnet check may actually be more current than their file. Second, the inventory and your home’s age work together: lead service lines were largely installed before the mid-1980s, so an older home with an “unknown” record is a stronger candidate for a hands-on check. The EPA estimates that up to 9 million homes across the country are still served by legacy lead pipes, so an unresolved record is not unusual.

Lead on the City Side, Your Side, or Both: Why It Matters

A service line usually has two owners, and lead can be present on either part. The publicly owned portion typically runs from the water main to a curb stop near the property line or sidewalk, and the customer-owned portion runs from there into the house, though the exact dividing point varies by utility and is sometimes the meter or the property line. Owning your property does not automatically mean you own, or are responsible for, the entire line.

This split matters for three reasons. It tells you who is likely responsible for repair or replacement of each segment, which is set by local rules and your utility’s tariff rather than by a single national standard. It explains why your indoor scratch test only reveals your side: the buried public segment could still be lead even if your visible pipe is copper. And it affects the records, because the utility’s inventory lists the system side and the customer side separately, sometimes with one known and the other unknown.

One related flag belongs here. A galvanized steel line that is, or ever was, downstream of a lead line gets classified as “galvanized requiring replacement,” because galvanized pipe can absorb and later release lead it picked up from upstream. So a galvanized result on your side is not automatically harmless if a lead segment sits ahead of it on the city side. The whole-line picture, not just the piece you can see, is what determines your situation. Deciding whether to replace a service line is a separate project that runs through your utility and a licensed plumber, and the broader question of when a home needs new piping is covered in our guide on when to repipe your house (106).

A Word on Safety: What Not to Do

Do not cut, dig up, or aggressively disturb a suspected lead service line to inspect it. The EPA has documented short-term lead increases at the tap around line repairs, partial replacements, and even nearby construction, which is why an old lead pipe should be left undisturbed until professionals handle it (the underlying leaching mechanics are covered in our companion guide on lead pipe health risks, linked above). A light surface scratch on an already-exposed pipe is fine. Excavation, pipe cutting, and any replacement work are jobs for the water utility and a licensed plumber, not a do-it-yourself afternoon.

Frequently Asked Questions

How can I tell if my service line is lead?
Find where the line enters near your water meter, scratch the bare pipe with a coin or key, and hold a magnet to it. If the scratch turns shiny silver and the magnet does not stick, it is likely lead. A yellow-orange scratch is copper, a scratch that looks silver but grabs the magnet is galvanized steel, and anything obviously plastic is not lead.

Is my city or am I responsible for replacing a lead service line?
It depends on which part is lead and on your local rules. A service line is usually split into a publicly owned portion from the main to roughly the curb and a customer-owned portion from there into the house, with the exact boundary varying by utility. Responsibility for replacement follows that ownership split and your water provider’s policies, so the answer comes from your utility rather than from a national rule.

Does an “unknown” listing on my utility’s inventory mean my line is safe?
No. “Unknown” means the utility lacks documentation, not that the line is confirmed lead-free. An unknown classification, especially on an older home, is a good reason to do your own scratch-and-magnet check or ask the utility to verify the material.

Can I confirm lead just by looking at the pipe?
You can identify the pipe material with the scratch and magnet tests, but only a certified laboratory test of your water can confirm whether lead is actually present in what comes out of your tap.

This article is general information, not professional advice. For confirmation of pipe material, water testing, or any work on a service line, consult your water utility and a licensed plumber.

Sources

  • EPA, Protect Your Tap: A Quick Check for Lead: https://www.epa.gov/ground-water-and-drinking-water/protect-your-tap-quick-check-lead-0
  • EPA, EPA Researchers Share Approaches to Identify Lead Service Lines: https://www.epa.gov/sciencematters/epa-researchers-share-approaches-identify-lead-service-lines
  • EPA, Final Lead and Copper Rule Improvements, Service-Line Inventory and Replacement Requirements (fact sheet): https://www.epa.gov/system/files/documents/2024-10/finallcrifact-sheet_service-line-inventory.pdf
  • EPA, Planning and Developing a Service Line Inventory: https://www.epa.gov/ground-water-and-drinking-water/planning-and-developing-service-line-inventory
  • EPA News Release, Final Rule Requiring Replacement of Lead Pipes Within 10 Years (Oct. 8, 2024): https://www.epa.gov/newsreleases/biden-harris-administration-issues-final-rule-requiring-replacement-lead-pipes-within
  • EPA, Basic Information about Lead in Drinking Water: https://www.epa.gov/ground-water-and-drinking-water/basic-information-about-lead-drinking-water

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