# Pipe Repair in San Francisco

> Pipe repair in San Francisco: water leak repair, burst pipe repair and copper pipe repair, when DBI needs a permit, and when a repair stops making sense.

URL: https://hilltoprepipesanfrancisco.com/pipe-repair/

Water leak, burst pipe and copper pipe repair on supply lines, with the permit question answered before the wall closes.

Last Updated: October 30, 2026

- **SFPC 104.2** The San Francisco code section that exempts leak repairs which do not cut into or remove pipe
- **$290** DBI Category 1P plumbing permit for work in a single residential unit
- **0 nights** Average nights a year at or below 32 F in downtown San Francisco, by NOAA's normals
- **80 psi** Static pressure above which the California Plumbing Code requires a pressure regulator

Pipe repair fixes one failing part of a water supply system without replacing the rest: a pinhole in a copper line, a weeping threaded joint in galvanized steel, a split fitting, a burst supply hose or a leak behind a wall. [Hilltop Repipe San Francisco](https://hilltoprepipesanfrancisco.com/) offers and manages pipe repair across San Francisco, Daly City and South San Francisco, covering water leak repair, burst pipe repair and copper pipe repair, with the work carried out by licensed and insured contractors. Burst pipes and active leaks are handled around the clock through [emergency pipe repair](https://hilltoprepipesanfrancisco.com/emergency-pipe-repair/).

A repair is the right answer when the failure is local and the pipe around it is sound. The work below covers how that is judged, what San Francisco’s code says about permits for repairs, and the point at which repairing the same system again stops making sense.

## What happens on the first visit

The first question is where the water is actually coming from. A stain on a ceiling can sit several feet from the leak above it, and water can travel along a joist before it drips. The leak is traced to its source and confirmed as supply pipe, which is under pressure all the time, rather than a drain, which only leaks when something is draining. Drain and sewer pipe are separate work, as the [guide to whether repiping includes drain pipes](https://hilltoprepipesanfrancisco.com/guide/does-repiping-include-drain-pipes/) explains. When the leak cannot be seen or reached, [water leak detection](https://hilltoprepipesanfrancisco.com/water-leak-detection/) comes first.

Once the leak is found, the pipe on both sides of it is checked: the material, the joints, signs of corrosion or earlier patches. Static pressure is measured when the failure is a burst or a repeat leak, because high pressure can cause both. The finish covering the pipe is noted, since plaster, tile and drywall each change the opening. Then the repair is chosen and the permit question is answered before anyone cuts.

## Repairs that need a permit and repairs that don’t

San Francisco’s plumbing code exempts a short list of work from permits, and the line it draws is cutting. A leak that can be repaired without cutting into or removing piping needs no permit, and neither does replacing a faucet, angle stop or hose bibb when no pipe is cut. Once a section of pipe is cut out and replaced, DBI requires a permit and an inspection before the pipe is covered by a wall or buried.

That rule shapes the job. A cut-out-and-splice repair behind a wall is done, pressure tested, and then left open until the inspector has seen it. In city permit records describing leak, burst or pipe repair work, the most common stated category is 1P, the single-unit permit at $290; repairs that include underground work are often filed as 2PB at $809. Since September 14, 2026, these permits are filed on PermitSF by the licensed contractor.

The suburbs draw the line in their own words. South San Francisco exempts stopping leaks, but when concealed pipe has become defective and is removed and replaced, its Building Division treats that as new work that needs a permit and inspection. Daly City lists a “Water Pipe Replacement” permit type and charges $101 to issue a plumbing permit plus $56.50 for each water piping item.

## Copper pipe repair

Copper usually fails as a pinhole or at a joint. A pinhole repair cuts out the damaged piece and joins in new tube with soldered or press fittings; a listed repair clamp can serve where cutting is impractical. A joint that weeps is cut out and remade. Either way, the repaired section is tested before it is closed in.

There is no single cause of copper pinholes. Water chemistry, flow velocity, workmanship and the age of the pipe all play a part. San Francisco’s water is soft, with average hardness of 62 ppm, and the utility adjusts its pH to about 9.3 for corrosion control, so a pinhole here is not proof of a water problem, and one leak does not prove the whole system is failing. A string of pinholes along the same run is different: that run is thinning, and replacing it, or moving to a [copper repiping](https://hilltoprepipesanfrancisco.com/copper-repiping/) or [partial repiping](https://hilltoprepipesanfrancisco.com/partial-repiping/) scope, usually beats repeated repairs. The [copper pinhole leaks guide](https://hilltoprepipesanfrancisco.com/guide/copper-pinhole-leaks/) goes deeper.

## Galvanized pipe repair

Galvanized steel fails from the inside. Its zinc coating wears through, the steel corrodes, and rust builds up until the pipe is narrow and thin, most often at threaded joints where the wall was already cut thinner by the threads. A leak at one joint can be repaired by replacing the nipple or fitting. Two cautions come with it. Turning old threaded pipe to make the repair can stress the joint next to it, and cutting into galvanized pipe can loosen rust that then travels to aerators and valve cartridges downstream.

When the repair joins new copper to remaining steel, San Francisco requires a dielectric or insulating fitting, or a brass nipple at least 6 inches long, so the two metals do not corrode each other at the joint. A galvanized system that leaks at one joint while showing low flow and rusty water elsewhere is telling a larger story, which the [galvanized pipe replacement](https://hilltoprepipesanfrancisco.com/galvanized-pipe-replacement/) page covers.

## Burst pipes in a city that doesn’t freeze

Freezing is not what bursts pipes in San Francisco. NOAA’s normals for downtown record no nights at or below 32 F in an average year, and only a tenth of a night in December at the airport. Bursts here come from corroded pipe that finally gives way, failed joints and fittings, worn washer and toilet supply hoses, water heaters, and pressure.

Pressure is worth measuring after any burst. San Francisco is served through about 13 pressure zones fed from reservoirs and tanks at different elevations, so the number at one address says little about the next. Where static pressure is above 80 psi, the California Plumbing Code requires a pressure regulator with a strainer and an expansion tank downstream, and a burst repaired without addressing high pressure can be followed by another. Water hammer, the bang when a valve snaps shut, is the other stress: San Francisco requires air chambers at quick-closing valves such as single-handle faucets and shower valves. The [burst pipe guide](https://hilltoprepipesanfrancisco.com/guide/burst-pipe-what-to-do/) covers the first minutes after a burst.

## Repair or repipe

One leak in otherwise sound pipe is a repair. The case for replacing more builds when leaks repeat in the same material, when low flow and rust show at several fixtures, when the pipe near the repair is visibly corroded, or when the house is about to be opened for a remodel anyway. A [partial repipe](https://hilltoprepipesanfrancisco.com/partial-repiping/) replaces a defined area and leaves the rest; a [whole-house repipe](https://hilltoprepipesanfrancisco.com/whole-house-repiping/) replaces everything from the main valve out. The [repipe vs repair guide](https://hilltoprepipesanfrancisco.com/guide/repipe-vs-repair/) works through the decision, and the [assessment tool](https://hilltoprepipesanfrancisco.com/tools/repiping-assessment/) scores a specific house.

## The water bill, the utility and the insurer

Under SFPUC’s rules the customer controls the water beyond the meter, and repairs on that side are the owner’s. If a leak ran up the bill, SFPUC’s leak allowance can return part of the excess, but only after the repair is made, with proof such as a plumber’s invoice, and the application is due within 15 days of the first notice of the high bill. South San Francisco is served by Cal Water, which requires leaks on the customer’s side to be repaired within five business days of its notice.

Homeowners insurance generally addresses sudden water damage under the terms of the policy rather than the cost of replacing worn pipe. Photographs, the failed piece of pipe and an itemized invoice help either way. The [insurance guide](https://hilltoprepipesanfrancisco.com/guide/homeowners-insurance-repiping/) explains the difference.

## What drives the price

No published local range for a single pipe repair holds up, because the repair itself is often the smaller part of the job. The drivers are access, whether the pipe is exposed or behind plaster, tile or a ceiling, the material, whether a section is cut out and so needs a permit and inspection, lead-safe setup when a pre-1979 wall is opened, after-hours timing and who closes the opening. The price is given once the leak has been found and the repair chosen.

## What's included

- The leak traced to its source and confirmed as supply pipe, not drain
- The pipe on both sides of the failure checked for material and condition
- Static pressure measured where a burst or repeat leak suggests it
- A repair matched to the failure: fitting, clamp, section replacement or reroute
- Listed transitions where a repair joins copper to steel
- A pressure test of the repaired section before it is covered
- A DBI permit and inspection when pipe is cut out and replaced
- An itemized invoice that names the leak, its location and the repair
- A note of nearby pipe that looks likely to fail next
- A written list of the opening and who patches it

## Repair a spot, replace a section or repipe

|  | Spot repair | Section replacement | Partial or whole repipe |
| --- | --- | --- | --- |
| Typical trigger | One leak at a fitting, valve or joint | A split, burst or pinhole in a run | Repeat leaks, low flow and rust together |
| What changes | A fitting, stop or clamp | One length of pipe cut out and spliced | Every line in a defined area, or all of them |
| Permit in San Francisco | Not when no pipe is cut or removed | Yes, with inspection before covering | Yes, with inspection before covering |
| Openings | Often none or one | One, sized to the section | Planned openings at each fixture group |
| What it leaves | The rest of the system as it was | Old pipe on both sides of the splice | Only what the scope lists as retained |
| Fits when | The rest of the pipe is sound | The failure is local and the pipe around it is sound | Failures are spreading or the pipe is restricting flow |

## Related resources

- Decision Guide [Repipe vs repair: when is a full repipe worth it?](https://hilltoprepipesanfrancisco.com/guide/repipe-vs-repair/)A repair fixes a defect. A repipe replaces a material that is failing everywhere. The work is telling the two apart, and the evidence is in the pipe, the pattern of leaks and the flow.
- Learn [What causes pinhole leaks in copper pipes?](https://hilltoprepipesanfrancisco.com/guide/copper-pinhole-leaks/)There is no single cause. Water chemistry, flow speed, workmanship, sediment and electrical conditions can each thin a copper wall until it opens, and where the leaks appear is the most useful clue to which one is at work.
- Learn [What should you do when a pipe bursts?](https://hilltoprepipesanfrancisco.com/guide/burst-pipe-what-to-do/)The first ten minutes decide how much damage a burst pipe does. Where San Francisco shutoffs usually are, what not to touch, who to call in the city and in San Mateo County, and what happens after the water stops.
- Learn [Does homeowners insurance cover repiping?](https://hilltoprepipesanfrancisco.com/guide/homeowners-insurance-repiping/)The line most policies draw between sudden water damage and pipe that wore out, what that means after a leak in an older San Francisco building, and how a planned repipe actually gets paid for.
- Learn [Does repiping include drain pipes?](https://hilltoprepipesanfrancisco.com/guide/does-repiping-include-drain-pipes/)A building has two plumbing systems that meet at the fixtures. Repiping replaces one of them. Here is where the line falls, why it falls there, and how to plan when both need attention.

## How a repipe runs

1. The call Describe the building Building type, floors, number of baths and units, the pipe you can see in the garage or basement, and what you have noticed.
2. Walk-through Map the pipe The supply is traced from the meter: pipe map, wall types, the main valve, the water heater and where access is easiest.
3. Scope Written scope and price Material, layout, every planned opening, the permit and who patches what, on paper before work is booked.
4. The work Permit, new lines, pressure test The permit is filed, new lines are run while the old ones still serve, fixtures are switched over and the system is pressure tested.
5. Sign-off Inspection, then patching The city inspector signs off with the pipe still visible. Then the openings are closed.

## What this work looks like

Short new copper section joined into an older copper line with two brass couplings

New brass nipple and union replacing a rusted joint in an old galvanized line on a concrete wall

New chrome angle stop and braided supply line under a sink

Water pressure gauge threaded onto a hose bibb on the stucco front wall of a San Francisco house

## Pipe repair questions

### Which leak repairs are exempt from a permit in San Francisco?

Repairs that fix the leak without cutting into or removing pipe, such as tightening a fitting or replacing a faucet, angle stop or hose bibb. Once a section of pipe is cut out and replaced, DBI requires a permit and an inspection before the pipe is covered; work in a single unit is often filed as Category 1P at $290.

### Is one pinhole in a copper line repaired, or the whole run replaced?

One pinhole is usually repaired: cutting out the damaged piece and soldering or press-fitting in new pipe, which is a permanent fix for that spot. If pinholes keep appearing along the same run, the pipe is thinning there, and replacing that run usually costs less than repairing it again and again.

### Why do water pipes burst in San Francisco when it hardly ever freezes?

Because freezing is not the cause here. NOAA's normals record no nights at or below 32 F in an average downtown San Francisco year. Bursts come from corroded pipe giving way, failed joints and fittings, worn supply hoses and water heaters, and pressure above what the system was built for.

### Is it worth repairing old galvanized pipe?

For one failed joint in pipe that still flows well, a repair can be sensible. Galvanized pipe corrodes from the inside, though, so a leak often arrives with low flow and rust at other fixtures. When those show up together, the repair buys time while a partial or whole-house repipe is planned.

### What decides the cost of a pipe repair?

Mostly access and what the repair involves: whether the pipe is exposed or behind plaster, tile or a ceiling, the material, whether a section has to be cut out (which brings a permit and inspection), lead-safe setup in a pre-1979 building, after-hours timing and patching. No published local range for a single repair holds up, so it is priced once the leak is found.

## Related services

### Water leak detection

Hidden supply leaks located by isolation and testing, so the wall that gets opened is the right one.

Water leak detection

### Emergency pipe repair

Burst pipes and active leaks, 24/7: stop the water, make the repair, then the permit and paperwork.

Emergency pipe repair

### Partial repiping

A defined part of the supply system replaced, such as the hot side, one floor, one bathroom group or one flat, with the old pipe that stays written down.

Partial repiping