The large plumbing jobs on a Bay Area house are the ones buried in walls and yards: galvanized supply pipe, the sewer lateral out to the street, and gas piping from the meter. Local rules shape them. In eight East Bay communities a lateral has to pass an air or water test before a sale closes, and in San Francisco the owner answers for the lateral up to the curb.
Older houses were often plumbed in galvanized steel, which rusts from the inside until the bore narrows and a shower loses pressure whenever another tap opens. A repipe replaces the supply lines from the main shutoff to each fixture and means opening walls and ceilings along the route, which in a plaster house is a real part of the job. San Francisco requires a plumbing permit before pipes are cut into or replaced, and the new pipe has to be inspected before the walls are closed.
The lateral is the pipe that carries everything from the house's drains to the public sewer main under the street. When it cracks, separates or blocks, the signs are slow drains on the lowest floor and backups after rain. A contractor runs a camera through it from a cleanout, then either repairs a section, replaces the whole run by trench, or proposes another method. The San Francisco Public Utilities Commission advises having a licensed professional inspect a lateral at least once every five years.
Moving a range, adding a gas dryer line or rerouting piping during a remodel is C-36 work that runs from the meter through the house to each appliance. The work also runs the other way now. The Air District's zero-NOx standards reach new residential tank water heaters in 2027 and furnaces in 2029 under the current schedule, and zero-NOx equipment today is electric, so a gas branch left unused after a switch is a job for a plumber too.
Many old houses have a main shutoff that has not been turned in decades and no longer closes fully, which matters most in an earthquake or a burst pipe. Replacing it, or adding a pressure regulating valve where street pressure runs high, is routine plumbing work. A regulator changes the system: it creates what the plumbing code calls a closed system, and San Jose's permit guidance states that a closed system, such as a house with a pressure reducing valve, must have an expansion tank.
A backwater valve on the building sewer lets waste flow out but closes when the public sewer surcharges, so sewage cannot rise out of a basement shower or floor drain during a storm. It is most useful on houses whose lowest fixtures sit below the street. The SFPUC points San Francisco owners to the Department of Building Inspection's Plumbing Division for installation guidance, and flooding from the sewer system can make a property eligible for its Floodwater Grant program.
The pipe between the water meter at the curb and the house belongs to the owner, and on older lots it can still be galvanized. Replacing it means a trench from the meter box to the foundation and a new connection at the main shutoff. In San Francisco the SFPUC has been replacing its own galvanized service lines on the utility side of the meter with copper, and it recommends owners replace galvanized lines on their side that may once have been connected to lead pipe.
CSLB's C-36 Plumbing class covers water and gas piping from the utility meter to the house, waste lines, water heaters, and safety devices such as earthquake valves, backflow preventers and pressure regulating valves. C-42 Sanitation System covers sewage and storm drain structures. A faucet or toilet swap is handyman work; a repipe, a new gas branch or a lateral replacement needs a permit and a licensed contractor. Look up the license number at cslb.ca.gov before you sign.
A lateral has an upper section, from the building to the curb, and a lower section, from the curb to the main. In San Francisco the whole lateral belongs to the property owner, but under most circumstances the SFPUC repairs the lower section once a plumber's inspection finds a problem there and the owner reports it through 311. In the East Bay communities under EBMUD's regional ordinance, the owner is responsible for both sections, except in Alameda and Albany, where responsibility ends at the property line or the curbside cleanout.
A cracked or open-jointed lateral does not only leak out. When winter storms soak the ground, groundwater and rain seep in through the same gaps, and that extra flow is exactly what the East Bay's lateral program aims to keep out, to cut the untreated and partly treated wastewater that reaches the Bay. That is why EBMUD's program measures a lateral with an air pressure test or a water exfiltration test rather than a visual look, and why a lateral that drains fine in summer can still fail one.
A century-old house has usually been replumbed in pieces: a bathroom in one decade, a kitchen in another, a basement laundry added by an owner. The result is a mix of galvanized, copper and plastic joined wherever the last job stopped. A contractor pricing a repipe or a lateral should expect surprises inside walls and under floors, and Oakland's permit rules draw a useful line: fixing a leak in a drain or vent pipe or clearing a clog needs no permit, but installing, changing or replacing piping does.
San Francisco's upper lateral is more than a pipe. The SFPUC notes it includes a trap and a vertical sewer vent, sometimes called a fresh air inlet, that rises to the sidewalk, and both are the owner's to maintain. The SFPUC also keeps a lookup map at sfpuc.gov/Lead showing addresses with galvanized service lines, and as of January 2026 it had identified 699 customer-owned galvanized lines it recommends replacing.
EBMUD's private sewer lateral rules apply in Alameda, Albany, Emeryville, Oakland, Piedmont, El Cerrito, Kensington and the Richmond Annex. EBMUD says most agencies in its wastewater area require a permit to work on a lateral, and Emeryville requires one even when the lateral is only being tested as it is. In Oakland, a permit is issued as soon as the application is submitted and paid when the work needs no plan review.
Well water changes the plumbing here. Santa Clara Valley Water reports that groundwater in the county averages over 250 mg/L of hardness, against under 120 mg/L for its treated surface water, and warns that hard water builds scale in pipes and fixtures that can lower water pressure. San Jose Water draws part of its supply from wells, so pressure loss in an old house may be scale as well as corrosion.
San Francisco requires a permit before anyone cuts into or replaces pipes carrying water, gas, hot air or cool air, especially pipes that will be covered by a wall or buried, with exemptions listed in San Francisco Plumbing Code Section 104.2. Permits are applied for online through PermitSF. A C-4 or C-36 contractor can pull a plumbing permit, and a B contractor after approval of the scope. Only owners of stand-alone single-family houses may take one out to do the work themselves.
Lateral work that crosses into the sidewalk or street needs a Side Sewer permit from San Francisco Public Works, covering work past the trap toward the roadway and up to the sewer main. Only a contractor holding a Class A license, a C-36 together with a C-12, or a C-42 can get one. Public Works also requires a street excavation bond, a call to Underground Service Alert (811) 72 hours before digging, and scheduling the inspection at least 10 days ahead.
In the eight communities covered by EBMUD's regional ordinance, a lateral needs a Compliance Certificate showing it is free of leaks when one of three things happens: the property is bought or sold, the owner builds or remodels above the ordinance's valuation threshold, or the size of the water meter changes. The certificate is required to close escrow on a sale, or for final sign-off on the building permit. Passing takes an air pressure or water exfiltration test, which the contractor sets up for verification once any repair is done.
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The owner owns the whole lateral, but the SFPUC handles the lower section, from the curb to the main, under most circumstances. Have a licensed plumber inspect it, and if the problem is in the lower lateral and cannot be fixed with maintenance, submit a service request through 311 or sf311.org. The upper section, from the house to the curb, is the owner's to repair to current San Francisco plumbing code.
Not necessarily replace it, but it has to pass. Oakland is one of the communities under EBMUD's Regional Private Sewer Lateral Ordinance, and a sale is one of its triggers. A Compliance Certificate is required to close escrow, showing showing the lateral does not leak, which means an air or water test. If the lateral fails, it is repaired or replaced and tested again.
The SFPUC says its plumbers have never found a customer-owned lead service line, but it recommends replacing customer-owned galvanized service lines because they may once have been connected to lead pipe, and those customers may request a lead test. Its lookup map at sfpuc.gov/Lead shows which addresses are on its list.
No. Swapping a faucet or a toilet on existing connections is handyman work, but gas piping falls under CSLB's C-36 Plumbing class and needs a permit in cities such as San Francisco and Oakland. Ask a C-36 contractor to quote it and to take out the permit, so the new piping is inspected before it is covered.
Usually because the house has, or is getting, a pressure reducing valve on the water service. With one in place, water heated in the tank has nowhere to expand back into the street main. San Jose's permit guidance states plainly that a closed system of that kind must have an expansion tank installed.
The SFPUC recommends having a licensed plumber or contractor inspect the lateral at least once every five years, and sooner if drains on the lowest floor slow down or back up in wet weather. Keeping grease, wipes and anything but toilet paper out of the drains protects it between inspections.
Checked against these public sources in September 2026. Codes and programs change: confirm permit rules with your city's building department and a license on the CSLB website before work starts.
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