Who owns the water service line in San Bruno, CA

San Bruno says it plainly: "the City maintains everything up to and including the water meter", and "the property owner is responsible for all maintenance within the property". So your water line is the City's problem out to the meter and yours from there in. That is the reverse of your sewer lateral in this city, which you own the whole way to the main, wye and all. This is San Bruno's own statement.

Which part of the pipe is yours

Water service line
Yours from the meter to your building
Why, and what to do
Sewer lateral
Yours all the way to the main, including the fitting where it joins
Why, and what to do

The thick length is yours.

Where the responsibility divides

San Bruno: Everything up to and including the water meter. The City's own guidance for property owners states that "the City maintains everything up to and including the water meter, therefore, we must have free access", and warns that "it is illegal to obstruct City access with landscaping, fences, planters, parked vehicles, and the like" and that "it is illegal to enter the City's water meter box for any reason". The meter and its box are described as the City's.
The property owner: Everything past the meter, and one specific thing you must install. The code states the duty: San Bruno Municipal Code § 10.08.090 provides that "the owners of premises taking city water, or having wastewater connections, shall keep their service pipes, stopcocks, service lines, plumbing, and any apparatus connected therewith, in good repair at their own expense". The City states that "the property owner is responsible for all maintenance within the property", and that "the property owner must provide a separate shut-off valve between the City meter and the building being serviced". What that pipe is made of is settled here in a way it is almost nowhere else: the Water Division reports that "there is no lead or galvanized requiring replacement service lines in the water distribution system for all service areas", and says the finding covers "any privately-owned or customer-owned service lines".
What else is worth knowing: Three things are worth knowing here, and the first is the one that costs money. Your two pipes divide in opposite places: the City maintains the water line to and including the meter, while your sewer lateral is yours for its whole length to the main - the City's sewer guidance says property owners "own the entire sewer lateral from their home to the point at which it connects with the Main Sewer line", wye included. A quotation for "the line out to the street" is therefore a different job depending on which pipe is meant, and a neighbour's experience with one tells you nothing about the other. The second is access: because the City maintains the meter, it needs to reach it, and the City says it is illegal to obstruct that access with landscaping, fences, planters or parked vehicles, or to open the meter box yourself. If your meter has disappeared under a hedge, that is worth fixing before you need it. The third is the valve. The City requires the property owner to provide "a separate shut-off valve between the City meter and the building being serviced" - that valve is yours, and it is the one to find before a leak rather than during one, because the City's valve at the meter is not for you to operate. And one thing to check before you rely on any of it: the City's own system covers about 91% of San Bruno and the next system, Millbrae, covers about 1%, with the rest of the ground unaccounted for in the State's register. Check the name on your water bill first: if it comes from Millbrae rather than from San Bruno, this page is not about your pipe.

City of San Bruno, Water Issues - "Property Owner's Responsibility for Water Lines", the City's statement that it maintains everything up to and including the water meter, that its access to the meter must be kept clear, that the owner must provide a shut-off valve between the meter and the building, and that the owner is responsible for all maintenance within the property

Also quoted:

Checked 2026-09-17

What San Bruno has told the State

Federal rules required every community water system to inventory its service lines and publish the result. These are the figures this one filed.

San Bruno has classified more of its service lines than most of California: 0.00% of its lines are unclassified, against 9.2% statewide.

Service lines reported: 11,677
Still unclassified: 0 (0.00%)

What this does not tell you

This describes who is responsible for which part of the pipe. It is not a record of what your own service line is made of.
Classified does not mean inspected. Across California only 22% of service lines were established by field inspection; most of the rest come from records, the year of construction, or a predictive model.
These figures were submitted to the State by the water system itself and were read on 2026-09-04. They may not reflect its current inventory - the system's own page is the place to confirm anything about a specific address.

Check your address with San Bruno

Your other pipe has a different answer

For the sewer lateral, San Bruno gives the opposite answer to the one above:

The property owner owns the entire lateral, upper and lower, including the wye at the City main - though the City will clear and root-cut the lower section where a permitted cleanout exists.

Your sewer lateral is yours to the main, fitting included; your water line stops being yours at the meter.

Same trench, separate authorities, decided separately.

Who pays for the sewer lateral in San Bruno, CA

How this compares across California

Why your two pipes disagree — the places where the sewer and water authorities contradict each other about the run beneath the road.
Which water systems know what is buried — how much of each California system’s network the utility can actually identify.