Who owns the water service line in Milpitas, CA

The City owns and maintains the water service line from the main up to and including your meter. Yours is the pipe from the meter box to where it enters the building. Milpitas says so in its own words, and says the same thing again in the inventory it filed with the State. This is Milpitas'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 from your property line to your building
Why, and what to do

The thick length is yours.

Where the responsibility divides

Milpitas: Everything from the main to the meter, ownership and upkeep both. The City states it plainly: "The City owns and maintains all water system infrastructure from the main, up to and including, the water meter which is otherwise known as the System-owned portion of the service line." Its lead service line inventory workplan, prepared for the State, puts the same line in the language of title - "the system-owned portion consists of the service line from the main to the meter (all of which belong to the City)". The water chapter of the code adds that "all water meters are and remain property of the City" and that "all water meters shall be maintained, repaired and replaced by the City".
The property owner: The pipe from the meter box to the building. The City draws it that way twice: "The Customer-owned portion of the service line consists of the pipe extending from the meter box to the building inlet", and, in the workplan, "the customer-owned portion consists of the piping from the meter to the building inlet". Replacing that pipe is permit work in Milpitas - the City's own building handout covers "the replacement of the existing water service piping between the meter and the building".
What else is worth knowing: One wrinkle, and it is about vocabulary rather than about your pipe. The water chapter of the code dates from 1964 and defines a "service" as running from the main to the PROPERTY LINE, including the meter - a different landmark from the one the City uses today, which is the meter itself. In Milpitas those two usually fall in the same trench, because the meter box is set at or about the property line; the City's own inventory drawing shows it there. They are still not the same sentence, and the newer documents are the ones that assign maintenance, which the 1964 code never did. If your meter sits well back from your property line, that is worth a call before anyone digs. One detail in the City's favour if it comes to an argument: Milpitas told the State that "service line tails are not standard in the City of Milpitas", meaning there is no stub of customer pipe left on the street side of the meter to argue about.

City of Milpitas, Water Service Line Inventory Program - the City's statement of what it owns and maintains, splitting the service line into a System-owned portion running from the main up to and including the meter and a Customer-owned portion running from the meter box to the building inlet

Also quoted:

Checked 2026-09-18

What Milpitas 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.

Milpitas 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: 16,537
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.
The State's service area map puts effectively all of Milpitas' land inside the boundary it maps for the city's own water system. Within the same city limits it also maps "SPRING VALLEY HEIGHTS ASSOCIATION INC" (1%). Measured 2026-09-11.
Classified does not mean inspected, and this system inspected less than most. Milpitas established 2.2% of its classifications by field inspection, against 22% across California; 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 Milpitas

Your other pipe has a different answer

For the sewer lateral, Milpitas says:

The user owns and maintains the house sewer - the portion of the pipe on private property, up to a cleanout at the property line. The run under the street is the City's, which the code requires it to hold full title to before it will provide service through it.

Your sewer lateral is yours to the property line; your water line stops being yours at the meter.

Same trench, separate authorities, decided separately.

Who pays for the sewer lateral in Milpitas, 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.