San Mateo, CA · plumbing service
Repiping in San Mateo, CA
Pre-war and mid-century homes still carry galvanized pipe. Call to be connected with an independent, licensed plumber who handles repiping in San Mateo; 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 Mateo
- 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 Mateo
Pre-war and mid-century homes still carry galvanized pipe.
With 68% of San Mateo'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
- 1963
- Homes before 1980
- 68%
- 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 Mateo homeowners with
Repiping in San Mateo: questions
Is a permit required to repipe a house in San Mateo?
Yes, but it's simple. San Mateo lists replacing or repairing residential water piping as an over-the-counter plumbing permit, so a licensed plumber can usually get it issued the same day.
Could old solder in my San Mateo home's copper pipes be a concern?
Possibly. Cal Water reports no known lead service lines in San Mateo, but notes lead can come from home plumbing like lead solder on copper joints and brass fixtures. Repiping with lead-free materials removes those sources.
Why is repiping a common call in San Mateo?
Pre-war and mid-century homes still carry galvanized pipe.
How old are most homes in San Mateo?
The median home in San Mateo was built in 1963, and 68% of homes were built before 1980 (U.S. Census Bureau, American Community Survey).
Should old pipes in a San Mateo 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 Mateo: pre-war and mid-century homes still carry galvanized pipe.
Who supplies water in San Mateo?
Cal Water. Past the meter, plumbing is the owner's.
Repiping near San Mateo
- Repiping in San Francisco, CARepiping in San Francisco, CA: many pre-war buildings still have galvanized supply pipe, which corrodes and narrows over decades.
- Repiping in Hayward, CARepiping in Hayward, CA: post-war tract homes still have galvanized lines that rust and lose pressure.
- Repiping in Sunnyvale, CARepiping in Sunnyvale, CA: post-war ranch homes and Eichlers carry galvanized or aging copper lines.
More plumbing services in San Mateo
- Sewer Line Repair in San Mateo, CASewer Line Repair in San Mateo, CA: old clay laterals crack and take in roots.
- Water Heater Replacement in San Mateo, CAWater Heater Replacement in San Mateo, CA: seismic strapping and venting are updated on replacement.
- All plumbing services in San MateoEvery plumbing service available to San Mateo homes.
Local rules and details for San Mateo
San Mateo facts behind this page
- The median home in San Mateo was built in 1963. [1]
- About 68% of San Mateo's housing units were built before 1980, the era of galvanized steel supply pipe, cast iron drains and clay sewer laterals. [1]
- In 2025 all water served to Cal Water's San Mateo customers was purchased from the San Francisco Public Utilities Commission. [2]
- The City of San Mateo includes replace or repair of water piping in residential dwellings, along with replacing drains or vents, among the plumbing permits that can be approved over the counter. Repiping a San Mateo home therefore requires a plumbing permit, but it usually does not need full plan review when it involves existing residential piping. [3]
- Cal Water says it has no known lead service lines in its San Mateo system and uses lead-free materials in system repairs and installations. Its 2025 report notes that lead in drinking water comes primarily from service lines and home plumbing, such as lead solder used to join copper plumbing and brass or other lead-containing fixtures, which are a reason older homes consider repiping. [2]
San Mateo rules and programs for repiping
- The City of San Mateo includes replace or repair of water piping in residential dwellings, along with replacing drains or vents, among the plumbing permits that can be approved over the counter. Repiping a San Mateo home therefore requires a plumbing permit, but it usually does not need full plan review when it involves existing residential piping. [3]
- Cal Water says it has no known lead service lines in its San Mateo system and uses lead-free materials in system repairs and installations. Its 2025 report notes that lead in drinking water comes primarily from service lines and home plumbing, such as lead solder used to join copper plumbing and brass or other lead-containing fixtures, which are a reason older homes consider repiping. [2]
Other common plumbing calls in San Mateo
- Sewer Line Repair: old clay laterals crack and take in roots.
- Water Heater Replacement: seismic strapping and venting are updated on replacement.
Sources (3)
- U.S. Census Bureau, ACS 2024 1-year (B25035) · checked 2026-10-01
- Cal Water, San Mateo System 2025 Water Quality Report · checked 2026-10-06
- City of San Mateo, FAQs: What is an Over-The-Counter Plumbing Permit? · checked 2026-10-20