Code and quoting

Water line replacement: how to quote the service line from the curb to the house

A main water line replacement is a dig, a permit, a utility and sometimes a lead pipe, all on one quote. Here is who owns which part of the line, which materials codes and utilities allow, trench vs trenchless, 811, depth, inspections, the federal lead pipe rule, what homeowners have read it costs, and a checklist.

Plumbo

By the Plumbo team · 8 min read

On this page
  1. Signs it's time
  2. Who owns which part of the line
  3. Materials codes and utilities allow
  4. Open trench or trenchless
  5. Call 811 before digging
  6. Depth below the frost line
  7. Permits and inspections
  8. Lead service lines and the federal rule
  9. Pressure test and backfill
  10. What homeowners are told it costs
  11. Water line quote checklist

A water service replacement looks simple on paper: new pipe from the curb stop or meter to the house. In the yard, it's a locate ticket, a trench or two bore pits, a permit, a utility that wants to see the work, and a homeowner who has read a cost guide. Miss one and the job pays less than it should.

This guide walks through what to check before you price an underground water line replacement, and ends with a checklist for the quote.

Rules on ownership, materials, depth and permits are local. The city and utility pages below are examples, not your rules. Call your water utility and building department before you quote.

Signs it's time

  • Pressure loss and a higher water bill. HomeAdvisor and Fixr both name these as signs of a failing main line.
  • Repeat leaks on an old line, or a leak notice from the utility. In Fremont, Nebraska, the utility sends notices for leaking or broken services and can turn the water off if the repair isn't arranged.
  • A line that freezes. Minneapolis tells owners whose service often freezes to consider having it lowered below the frost.
  • Lead or galvanized pipe. These are the lines water systems now have to find and replace (see below).

Who owns which part of the line

Before you quote, find out where your customer's responsibility starts. It varies a lot:

UtilityUtility's partOwner's part
Batavia, New YorkMain to curb stop, including the curb stop and curb boxPast the curb stop to the house
Fremont, NebraskaThe main and the meterThe whole service line, from the main to the house, including the corporation and stop box
Minneapolis, MinnesotaThe mainFrom the main connection to the meter, including curb valves
Philadelphia, PennsylvaniaThe mainPipes inside and outside the home, up to the main

Bismarck, North Dakota adds a twist: the owner owns the service, but under a city policy a monthly fee on residential bills pays for some leak repairs at the main connection and the curb stop, and can reimburse restoring service to a frozen line. Ask whether your utility has a program like that before you quote work it may pay for.

Materials codes and utilities allow

The model code's water service table (Table 605.3 in the International Plumbing Code) lists many materials. Michigan's amended version includes copper tubing Types K, WK, L, WL, M and WM; PEX; and polyethylene pipe and tubing, the family HDPE belongs to; among others. Each comes with its ASTM, AWWA or CSA standard.

The utility can be stricter. Waukee, Iowa's design standards for new water services (July 2021) require:

  • Type K soft copper (ASTM B88) from the main to the curb stop box.
  • From the curb stop box to the building, either copper or PEXa pipe certified to AWWA C904 and ASTM F876, or PE pipe to AWWA C901, Class 200, DR9.
  • A #12 AWG solid blue tracer wire on the PEX service, fastened every 5 feet.
  • A 1-inch minimum service size.

Ask for the utility's spec sheet before you pick the material on the quote.

Open trench or trenchless

  • Open trench. Dig, replace, backfill, restore. Simple to inspect, but you pay for the yard, the driveway cut and the landscaping.
  • Trenchless. Dig a pit at each end and pull a new line through, either behind a bursting head along the old path or through a hole bored by a directional drill. Less restoration, more equipment, and you need to know what's in the way.

HomeAdvisor's cost guide (June 19, 2026) puts trench replacement at $50 to $250 per foot and trenchless at $75 to $150 per foot. Those are homeowner averages, but they show why the method belongs on the quote as a choice, not a footnote.

Call 811 before digging

Call811.com says anyone planning to dig must contact 811, by phone or through their state 811 center's website, a few business days before digging. Utilities then mark their lines with paint or flags. You get a ticket number and instructions for confirming that every utility has responded. Wait for all of them before you dig, and dig around the marks, not on them.

Put the ticket on your schedule, and note on the quote that the dig date depends on it.

Depth below the frost line

Water lines freeze when the frost reaches them. Minneapolis says a service line can freeze when frost reaches its depth, or where it enters an unheated basement. The required depth is local: ask the water utility or building department for their minimum cover before you dig, and write it on the quote.

Depth drives cost: deeper trenches mean more digging, shoring and backfill. Get the number from the utility or the code before you measure.

Permits and inspections

Two examples of what to expect:

  • Fremont, Nebraska: repairs must be made by a master plumber licensed by the city, with a permit from the Department of Utilities before any work starts. Service lines can't be relocated, repaired or modified without one, and the Department inspects the work.
  • Waukee, Iowa: notify the city 48 hours before tapping the main, before any shutdown, and when the service is complete. Only the city may operate valves, and you backfill only after the city has inspected.

Put the permit fee, the inspection visit and the wait for the inspector on the quote. HomeAdvisor tells homeowners to budget $150 to $500 each for permits and inspections in many cities.

Lead service lines and the federal rule

EPA finalized the Lead and Copper Rule Improvements in October 2024. It took effect December 30, 2024, and water systems must comply by November 1, 2027. The main points for a plumber:

  • Water systems must replace lead and "galvanized requiring replacement" service lines under their control within 10 years, at an average of 10 percent a year, with some shorter or longer deadlines.
  • The rule prohibits water systems from doing partial lead line replacements, except during an emergency repair or with other planned infrastructure work. After an emergency partial, the system must offer to replace the rest within 45 days.
  • Systems keep inventories of service line materials, and replacement plans, that the public can see.

EPA's fact sheet says new lead pipes were banned in 1986 and up to 9 million homes and businesses are still connected through lead lines. If you find lead on a job, check the utility's inventory and ask whether it has a replacement program before you quote only the owner's side. Replacing your half while lead stays on the other is the partial replacement the rule is trying to end.

Pressure test and backfill

Test the new line the way your code and the utility require, with the trench open and the inspector's sign-off before you cover it. Bed plastic pipe as the manufacturer and the spec require. Flush the line before you open the house valves. Write the test and the inspection on the invoice.

What homeowners are told it costs

Cost guides tell you what the customer has read, not what to charge.

Source (homeowner averages)FigureRange
HomeAdvisor, updated June 19, 2026Main water line replacement, average $1,703$647 – $2,834
HomeAdvisor, updated June 19, 2026Per linear foot$50 – $150 (up to $250)
Fixr, updated August 29, 2025Main water line installation, average $3,750$1,500 – $12,000

Your price comes from the length, depth, method, restoration, permit and your own hourly cost. A 15-foot pull through soft soil and a 90-foot trench under a driveway aren't the same job, whatever the national average says.

Plumbo, now on the App Store and Google Play, turns a voice note from the yard into a quote from your own price book, asks only what's missing, and checks it for forgotten items like the permit or restoration before the customer signs on your phone. Try the 60-second demo →

Water line quote checklist

  1. Ownership: where the owner's part starts, and whether the utility pays for any of it.
  2. Existing material: lead, galvanized, copper or plastic, and the utility's inventory record.
  3. Length and depth, measured, plus the required depth.
  4. Material and size allowed by code and the utility's spec.
  5. Method: open trench or trenchless, as options if both fit.
  6. 811 ticket, and ask about private lines on the property, such as sprinkler or yard lighting.
  7. Connections: curb stop or meter side, house side, new valves, tracer wire.
  8. Wall or foundation penetration and sealing.
  9. Permit, utility fees, inspections and waiting time.
  10. Pressure test, flush and disinfection if required.
  11. Restoration: backfill, compaction, sod, concrete or asphalt.
  12. Exclusions: rock, unknown obstructions, work on the utility's side.

Lay it out with options in the plumbing proposal template.

Sources

All guides →