What a plumber does about a pipe that's leaking
First the water gets stopped, then the plumber finds where it's escaping and decides between a patch and cutting out a length of pipe. A leak behind a wall or under a slab has to be found before it can be fixed, and reaching it may mean opening finished surfaces. Ask who closes them up.
Newport Beach's copper repipe checklist asks for a water supply pressure test of "not less than fifteen minutes" (CPC 609.4). Your city may set different inspection steps, so ask the building department what it checks before a wall is closed.
- Shut the main valve and open the lowest faucet so the lines drain.
- Find the leak and see how far the wet or stained area spreads.
- Patch the pipe or cut in a new section, then turn the water back on.
- Pressure-test the joints, and tell the homeowner what to watch for over the next few days.
Leak repair costs in California: estimates
For a leak a plumber can reach, our model gives $170 to $685 per repair. That's built from 3 national published ranges and scaled for California plumber pay, so treat it as an estimate, not a quote. Slab and main-line leaks are different jobs and sit outside it. So does the cost of drying out and fixing water damage.
| Item | Figure | What it is |
|---|---|---|
| Estimated range, not a quote | $170 to $685 per repair | Built from 3 national published ranges, adjusted by the California plumber wage ratio (1.14). California company prices are shown separately. Basis: no state company sample (no counted California company price for this job), national estimate only. |
| Plumber wage, California mean | $39.58 an hour | BLS's May 2025 mean hourly wage for plumbers in California, which is a worker's pay and isn't a company's billing rate. |
Estimated range. Built from national published ranges (3 sources), adjusted by California's plumber wage ratio to the US (1.14, BLS May 2025), plus the local permit fee where the city publishes one. Not a quote. California plumbing companies that publish a price get their own rows, apart from the estimate. We have no counted California company price for this job, so the range is our national estimate alone. Full method. Prices as of Oct 23, 2026.
The lead-free rule for any pipe that goes in
Health and Safety Code 116875 bars any pipe, fitting, fixture, solder or flux that isn't "lead free" from plumbing that supplies drinking water. Lead free means no more than 0.2 percent lead in solder and flux and a weighted average of 0.25 percent on the wetted surfaces of pipes, fittings and fixtures. The products have to be certified by an ANSI-accredited third party. Ask what the new section is.
Leak signs that call for a plumber now
- A burst pipe is spraying and the main valve won't shut it off.
- Water is heading for the electrical panel, or dripping through a ceiling.
- Water is rising through a floor and you can't see where it starts.
- A slow drip at one fixture, once its stop valve is closed.
- A damp patch that hasn't spread in several days, with no drip you can find.
Until the plumber arrives
- Shut the main valve, and use the shutoff finder if you don't know where it is.
- Mop up what you can reach and move belongings out of the wet area.
- Stop hunting if the source isn't obvious, and leave the search to the plumber.
- Take photos of the damage before any repair starts.
When a leak repair turns into permit work
Repairing or altering a structure takes a separate permit from the building official, CSLB says, and code requirements vary by city and county. The state's pages don't say whether a patch counts differently from a replaced section, so ask your building department before the work starts.
B&P 7048 lifts the license requirement for a job under $1,000 in labor, materials and everything else, but only when it needs no building permit. AB 2622 raised it from under $500. Splitting a job into smaller contracts to stay under the limit isn't allowed, and anyone who advertises as a contractor or employs workers loses the exemption.
Ask for the license number before any work starts and look it up on CSLB's Check a License page, which shows whether the license is active and any complaint disclosure.
Questions people ask
Should I call a plumber for a leak I can't find?
Yes, when water keeps showing up and no fixture or visible joint explains it. Shut the main off while you wait.
How do I stop a leak until the plumber gets there?
If the water's coming from a fixture, close the stop valve under it. Otherwise, or if you can't tell, shut the main valve and open the lowest faucet to empty the lines.
How much is a plumber's hourly rate in California?
For emergency labor our model gives $115 to $570 per hour of labor, before any call-out fee, which is an estimate, not a quote. BLS reports a California mean wage of $39.58 an hour for plumbers, and that's their pay, which isn't the rate a company bills.
Is a permit needed to fix a leak in California?
CSLB says repairs and alterations need a permit from the building official and that requirements differ between cities and counties. A job under $1,000 that needs no permit is outside the license law (B&P 7048), so the permit answer also tells you whether a license is required.
Does replacement pipe have to be lead free?
Yes. HSC 116875 bars pipe, fittings, fixtures, solder and flux that aren't lead free from plumbing for human consumption. The limits are 0.25 percent on wetted surfaces and 0.2 percent in solder and flux.
- U.S. Bureau of Labor Statistics, OEWS May 2025: Plumbers, Pipefitters, and Steamfitters (SOC 47-2152), California, mean hourly wage Read Oct 23, 2026.
- U.S. Bureau of Labor Statistics, OEWS May 2025: Plumbers, Pipefitters, and Steamfitters (SOC 47-2152), United States, mean hourly wage Read Oct 23, 2026.
- PlumberMatch: how we estimate costs, California (editorial policy) Read Oct 23, 2026.
- CSLB: Do I need a building permit for my project? Read Oct 20, 2026.
- Business and Professions Code 7048 Read Oct 20, 2026.
- AB 2622 chaptered text (Legislative Counsel's Digest) Read Oct 20, 2026.
- Health and Safety Code 116875 Read Oct 20, 2026.
- City of Newport Beach: Copper Water Line Repipe inspection checklist (PDF) Read Oct 20, 2026.