How do I know if I have polybutylene?

Polybutylene is gray flexible plastic and can be stamped PB2110. It was installed in houses built from about 1978 to 1995, alongside copper. A house from that period is a reason to look, not proof.

How do I tell polybutylene from PEX?

Read the printing. PEX is red, blue or white and printed “PEX” along its length. Polybutylene is gray and can be stamped PB2110. If you cannot tell, a plumber can from an exposed section.

Do I have lead pipes?

Ask your water system what your service line is recorded as: EPA requires systems to publish their inventory. New lead pipe was banned in 1986. A magnet does not stick to lead, and a coin scratch shows soft, dull silver.

What is galvanized pipe?

Steel pipe coated with zinc, gray with threaded joints, and a magnet sticks to it. It corrodes from the inside, which can lower water pressure. Galvanized pipe downstream of a lead line is its own inventory category.

Should I replumb because of the year?

No. Replumb decisions rest on the material you have confirmed and on the pattern of leaks. One leak on sound pipe can be a repair. Use the repipe estimator with the footage from a bid.

Why do the decade ranges overlap?

Because materials did not change on a set date. Copper was installed in every decade here, and builders switched at different times.

HyrePlumber tools

What pipes are in my house?

Type the year the house was built for a starting point, then check the exposed pipe and your water system’s service line record.

9 million homes and businesses still on lead service lines EPA, Lead and Copper Rule Improvements fact sheet, October 2024, retrieved September 5, 2026: up to 9 million, despite the 1986 ban on new lead pipe.

The year a house was built tells you what to look for, not what you have: confirm by reading the pipe where it is exposed. Houses from 1978 to 1995 can have gray polybutylene; older houses can have galvanized steel. Ask your water system what your service line is recorded as.

What to look for in your house

A starting point, not a report. Nothing is stored or emailed.

— Supply pipe to look for

— Drain pipe

— What this is not

What this assumed —

A decade guide, not an inspection. The printing on the pipe settles it.

Worked examples

Two houses, run through the tool

Built in 1988

Look for copper, and for gray polybutylene stamped PB2110. The year is a reason to look, not a finding: plenty of houses from that period have copper.

Built in 1940

Look for galvanized steel inside, and ask the water utility what the service line is. The house predates the 1986 federal ban on new lead pipe.

A decade guide, overlapping on purpose. It is HyrePlumber’s starting point for a look, not a record of any house.

Ask your water system about the service line first

The service line runs from the water main to your house. Your water system keeps a record of what it is made of.

EPA: “The federal government banned the installation of new lead pipes in 1986, yet up to 9 million homes and businesses are still connected to water mains through legacy lead pipes in neighborhoods across America.”

The record. “Under existing requirements, regulated water systems are completing initial inventories of their lead service lines in October 2024, and regularly update those inventories under the Lead and Copper Rule Improvements. Water systems are required to make their inventory and replacement plans available to the public.”

The deadline. “For the first time, the vast majority of water systems will be required to replace lead service lines within 10 years.”

What to ask. What is my service line recorded as? Where is the boundary between the utility’s part and mine? Am I in the replacement plan, and is there help with the cost?

What each service line category means

Water systems sort each line into categories under EPA’s rule. Here is what each one tells you.

Category	What it means	What it does not mean	Next step
Lead	All or part of the line is lead	A reading of your tap water	Ask where you are in the replacement plan, and whether your side is included.
Galvanized requiring replacement	Galvanized pipe that is or was downstream of lead	That all galvanized pipe is a lead problem	Plan for it as you would a lead line.
Lead status unknown	No record yet	Safe or unsafe	Ask whether the system has a guide to identifying it yourself.
Non-lead	Copper, plastic or another material	That the plumbing inside is lead-free	Look at the interior pipe and fittings.

US Environmental Protection Agency, EPA’s Lead and Copper Rule Improvements, October 2024 fact sheet, retrieved September 5, 2026. A summary for homeowners, not a regulatory reference; your state can add requirements.

How to identify the pipe yourself

Look where the pipe is exposed. The printing along it beats any year, including the one you typed.

Where to look

The connections at the water heater, under the kitchen and bathroom sinks, where the supply enters the house, and the laundry hookups. For drains, a cleanout or the main stack.

Read the printing

Plastic pipe carries printing along its length: material, standard, pressure rating and sometimes a date. Copper is marked too, with the wall type color-coded in the print.

Magnet and scratch

A magnet sticks to galvanized steel, not to copper or lead. A gentle coin scratch on lead shows dull silver and marks easily. Only on dry, exposed pipe, and never scrape hard.

When to ask a plumber

If the pipe is behind finished walls, the material is unclear, or money depends on the answer.

The supply pipe materials you may find

Material	What it looks like	What to ask
Galvanized steel	Gray metal, threaded joints; a magnet sticks	Is pressure low at several fixtures? Was it downstream of a lead service line?
Copper	Reddish-brown metal, soldered joints	Any pinhole leaks, and where? What does the water report say about chemistry?
Polybutylene	Gray flexible plastic, can be stamped PB2110	Can the fittings be seen? Does your insurer ask about it?
PEX	Red, blue or white flexible plastic, printed along its length	Which fitting system, and is it rated for the use?
CPVC	Cream or tan rigid plastic, glued joints	Is it exposed to sunlight or heat near the water heater?
Lead	Dull gray, soft, marks with a coin; a magnet does not stick	Call your water utility and ask about the service line.

HyrePlumber’s identification guide, not a lab test. A plumber can confirm from an exposed section.

What to ask, and of whom

Water system: what does the inventory say about my address?
And where the utility’s part of the line ends.
Water system: am I in the replacement plan?
When, and whether there is help with the private side.
Plumber: what is it, where did you look, and can you show me?
A material named from an exposed section.
Plumber: one failed part, or the whole system?
One leak can be a repair; leaks in unrelated places point wider.
Plumber: could it be done in stages?
The failing run first, the rest when walls are open anyway.
A material call made without looking
A year or a listing is not an inspection.

Questions this tool answers

What pipes are in my house?: Look where the pipe is exposed: at the water heater, under sinks and where the supply enters the house. The printing along plastic pipe names the material. The build year only tells you what to look for.
How do I know if I have polybutylene?: Polybutylene is gray flexible plastic and can be stamped PB2110. It was installed in houses built from about 1978 to 1995, alongside copper. A house from that period is a reason to look, not proof.
How do I tell polybutylene from PEX?: Read the printing. PEX is red, blue or white and printed “PEX” along its length. Polybutylene is gray and can be stamped PB2110. If you cannot tell, a plumber can from an exposed section.
Do I have lead pipes?: Ask your water system what your service line is recorded as: EPA requires systems to publish their inventory. New lead pipe was banned in 1986. A magnet does not stick to lead, and a coin scratch shows soft, dull silver.
What is galvanized pipe?: Steel pipe coated with zinc, gray with threaded joints, and a magnet sticks to it. It corrodes from the inside, which can lower water pressure. Galvanized pipe downstream of a lead line is its own inventory category.
Should I replumb because of the year?: No. Replumb decisions rest on the material you have confirmed and on the pattern of leaks. One leak on sound pipe can be a repair. Use the repipe estimator with the footage from a bid.
Why do the decade ranges overlap?: Because materials did not change on a set date. Copper was installed in every decade here, and builders switched at different times.

Sources and methodology

Figures dated September 5, 2026. Last reviewed September 29, 2026.

Lead and Copper Rule Improvements, general public fact sheet (October 2024) (US Environmental Protection Agency, retrieved September 5, 2026). The 1986 ban, up to 9 million connections, public inventories and the 10-year replacement requirement.
Lead and Copper Rule Improvements (US Environmental Protection Agency, retrieved September 5, 2026). The service line inventory categories.
Lead service lines (US Environmental Protection Agency, retrieved August 26, 2026). What a service line is and who owns which part.

Pipe materials Each material in depth, and how it fails.
Repiping What a repipe job includes.
Repipe cost estimator Check a repipe bid from its footage and rate.
Water treatment Filters and treatment, including for lead.
Water hardness calculator Read the rest of your water report.

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