San Jose, CA · plumbing service
Repiping in San Jose, CA
Older galvanized and early copper supply lines in mid-century homes cause pressure loss and pinhole leaks. Call to be connected with an independent, licensed plumber who handles repiping in San Jose; they diagnose the problem and quote the work before starting.
By calling, you agree to be connected with an independent plumbing contractor serving your area. Calls may be recorded for quality and training. The call and referral are free, and you are never obligated to hire.- Licensed local plumbers
- Free call and referral
- You approve the quote first
Common signs
- Rusty water
- falling pressure
- repeated pinhole leaks
Repiping services in San Jose
- RepipingReplacing old galvanized, polybutylene or failing copper lines.
- Pipe RepairLeaks, corrosion, cracked lines and low pressure from damaged pipes.
- Leak DetectionHidden leaks behind walls, ceilings or floors, or a bill that suddenly jumps.
- Water Line RepairLeaks and breaks in the main line from the meter.
- Water Pressure ProblemsDiagnosing low or high water pressure.
Problems repiping fixes
- Rusty or discolored water
- Pinhole leaks in different places
- Falling water pressure
- Galvanized or polybutylene supply pipe
Why repiping comes up in San Jose
Older galvanized and early copper supply lines in mid-century homes cause pressure loss and pinhole leaks.
With 59% of San Jose's housing built before 1980, a large share of homes still has original galvanized steel or early copper supply lines. Galvanized pipe rusts from the inside, which is why repiping questions here usually start with brown water or falling pressure.
- Typical home built
- 1976
- Homes before 1980
- 59%
- Water hardness
- 16.8 gpg
- very hard
- Winter freezes
- Rare
How the work is done
- 1Survey the systemIdentify the pipe material, its condition and the fixture count.
- 2Plan the routeChoose PEX or copper and plan wall openings to keep them small.
- 3Permit and installRepiping usually requires a permit; fixtures are reconnected in stages.
- 4Pressure test and patchTest before inspection; openings are patched afterward.
What affects the price
The plumbing company sets the price after seeing the job; ask for it in writing before work starts.
- Size of the home and number of fixtures
- PEX or copper
- Access through walls, attic or crawlspace
- Drywall repair
- Permit and inspection
Plumbing work we connect San Jose homeowners with
Repiping in San Jose: questions
Who owns the water pipe between the meter and my house in San Jose?
For San Jose Water customers, SJW owns the pipes up to the meter outlet coupling; the customer is responsible for the service line from that coupling to the house.
Do I need my own shut-off valve when repiping a San Jose home?
Yes. San Jose Water says CPUC Rule 16 requires customers to provide and maintain a shut-off valve between SJW and their service line.
Why is repiping a common call in San Jose?
Older galvanized and early copper supply lines in mid-century homes cause pressure loss and pinhole leaks.
How old are most homes in San Jose?
The median home in San Jose was built in 1976, and 59% of homes were built before 1980 (U.S. Census Bureau, American Community Survey).
How hard is San Jose's water?
About 16.8 grains per gallon (very hard), per San Jose Water, 2025 Annual Water Quality Report (main system).
Should old pipes in a San Jose home be repaired or replaced?
One leak in otherwise sound pipe is usually repaired; when galvanized or failing pipe leaks in several places, repiping costs less over time. In San Jose: older galvanized and early copper supply lines in mid-century homes cause pressure loss and pinhole leaks.
Who supplies water in San Jose?
San Jose Water. Past the meter, plumbing is the owner's.
Repiping near San Jose
More plumbing services in San Jose
- Water Heater Replacement in San Jose, CAWater Heater Replacement in San Jose, CA: with the median home built in the mid-1970s, many houses are on their second or third water heater, and hard water shortens each one's life.
- Water Softener Installation in San Jose, CAWater Softener Installation in San Jose, CA: homes served mostly by valley groundwater can see water above 16 grains per gallon, where softening protects heaters and fixtures.
- Emergency Plumbing in San Jose, CAPlumbing emergency in San Jose, CA? Who to call (San Jose Water or a plumber), what to shut off first, and the emergencies most likely in San Jose homes.
- All plumbing services in San JoseEvery plumbing service available to San Jose homes.
Local rules and details for San Jose
San Jose facts behind this page
- The median home in San Jose was built in 1976. [1]
- About 59% of San Jose's housing units were built before 1980, the era of galvanized steel supply pipe, cast iron drains and clay sewer laterals. [1]
- San Jose Water reports hardness by source: groundwater averages about 16.8 grains per gallon (10.2 to 26.4), local mountain surface water about 9, and purchased imported water about 5.8 (4.5 to 8.5). [2]
- San Jose Water (SJW) is responsible for the pipes from the water main under the street to the meter outlet coupling, including the service line from the main to the curb stop or angle stop. Customers are responsible for everything from the connection of their service line to SJW's coupling, so house-side repiping is the owner's job. [3]
- San Jose Water notes that California Public Utilities Commission Rule 16 requires customers to maintain their service line in good condition and to provide and maintain a shut-off valve between San Jose Water and their service line. SJW asks customers not to shut off water at the meter box or tamper with the meter, and to call SJW instead. [3]
San Jose rules and programs for repiping
- San Jose Water (SJW) is responsible for the pipes from the water main under the street to the meter outlet coupling, including the service line from the main to the curb stop or angle stop. Customers are responsible for everything from the connection of their service line to SJW's coupling, so house-side repiping is the owner's job. [3]
- San Jose Water notes that California Public Utilities Commission Rule 16 requires customers to maintain their service line in good condition and to provide and maintain a shut-off valve between San Jose Water and their service line. SJW asks customers not to shut off water at the meter box or tamper with the meter, and to call SJW instead. [3]
Other common plumbing calls in San Jose
- Water Softener Installation: homes served mostly by valley groundwater can see water above 16 grains per gallon, where softening protects heaters and fixtures.
- Water Heater Replacement: with the median home built in the mid-1970s, many houses are on their second or third water heater, and hard water shortens each one's life.
Sources (3)
- U.S. Census Bureau, ACS 2024 1-year (B25035) · checked 2026-10-01
- San Jose Water, 2025 Annual Water Quality Report (main system) · checked 2026-10-01
- San Jose Water, Who's Responsible for What? · checked 2026-10-19