Copper, PEX or HDPE: what replaces a lead service line?
Updated November 2, 2026
What pipe replaces a lead water service line?
Usually Type K copper. Some utilities and codes allow HDPE or PEX plastic, especially for trenchless pulls. Your utility or local code typically sets the material.
When a lead line comes out, the new one is almost always copper or plastic. The utility or your local plumbing code usually decides which, but it helps to know the trade-offs.
The common options
| Material | Why it's used | Watch for |
|---|---|---|
| Type K copper | The standard for buried service lines. Durable, long track record, and easy to pull through a trenchless bore. | Costs more than plastic. Can corrode in very aggressive soil or water. |
| HDPE (polyethylene) | Flexible, comes in long coils with no joints, and resists corrosion. Common in trenchless pulls. | Must be rated for potable water and installed with proper fittings. Can't be located with a metal detector unless a tracer wire is laid. |
| PEX | Flexible and inexpensive. Some codes allow it for service lines. | Not allowed for buried service lines everywhere. Check local code and the manufacturer's rating. |
What utility programs install
Most city replacement programs install copper for both sides, and some use HDPE. If the utility is doing the work, you usually don't choose. If you are hiring your own plumber, ask what your utility requires before the job, because many utilities set the material and size for the connection to their curb stop.
Questions to ask a contractor
- What material and diameter will you install, and does it meet the utility's specification?
- Is the pipe certified to NSF/ANSI 61 for drinking water?
- Will you lay a tracer wire if the pipe is plastic?
- Will you replace the curb stop and the meter connection, and who restores the lawn or sidewalk?
- Will you flush the line and give me a filter afterward?
Does a bigger line help?
Older lead lines are often 5/8 or 3/4 inch. Many utilities now install 1 inch, which can improve water pressure, especially for homes with sprinklers or long runs. Ask whether upsizing costs extra.
Sources: EPA: Lead and Copper Rule Improvements
Common questions
What pipe replaces a lead water service line?
Usually Type K copper. Some utilities and codes allow HDPE or PEX plastic, especially for trenchless pulls. Your utility or local code typically sets the material.
Is PEX allowed for a water service line?
In some places. It depends on your local plumbing code and the pipe's rating for buried use. Ask your utility and plumber before choosing it.
Find your city's program
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