Who owns the water service line in San Carlos, CA

The utility owns the service pipe, the curb stop, the meter and the meter box. The customer owns the piping past the meter - and the curb stop, which folklore treats as the boundary, is expressly the utility's. This is California Water Service, San Carlos system (Mid-Peninsula District)'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 the cleanout to your building — if certain conditions are met
Why, and what to do

The thick length is yours. A dashed marker means the position depends on your property — see below.

Where the responsibility divides

California Water Service, San Carlos system (Mid-Peninsula District): The utility's CPUC tariff states that "the service pipe, curb stop, meter, and meter box furnished by the utility at its own expense and located wholly or partially upon a customer's premises are the property of the utility" - so the run from the main, the fitting at the curb, and the meter itself are all the utility's, even where they sit on the customer's land.
The property owner: The piping from the meter onward. The tariff makes this the customer's own job as a condition of getting service: they must "furnish and lay the necessary piping to make the connection from the service connection to the place of consumption" and must "keep such piping in good repair" (section A.2.a). Cal Water puts the same line to householders in plainer words on its help page "Who is responsible for making repairs?": "Property owners are responsible for repairs to plumbing on their side of the water meter." The same page pairs that with "Cal Water is responsible for repairs within the distribution system", which does not say whether the pipe running to your meter counts as part of that system - so if the leak is on the street side of the meter, that is the sentence to put to them.

California Water Service, Rule No. 16 - Service Connections, Meters and Customer's Facilities, section A.3.a (CPUC-approved tariff, Advice Letter 2421, effective 21 September 2021)

Also quoted:

California Water Service, Who is responsible for making repairs?

Checked 2026-09-19

What California Water Service, San Carlos system (Mid-Peninsula District) 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.

California Water Service, San Carlos system (Mid-Peninsula District) has classified less of its network than most of California: 92.3% of its service lines are still unclassified, against 9.2% statewide.

Service lines reported: 10,921
Still unclassified: 10,076 (92.3%)

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 93% of San Carlos' land inside the boundary it maps for California Water Service, San Carlos system (Mid-Peninsula District). A share of land is not a share of homes: open space counts the same as a dense block. Measured 2026-09-11.
Unclassified means nobody has established what the pipe is made of. It does not mean lead was found.
Classified does not mean inspected, and this system inspected less than most. California Water Service, San Carlos system (Mid-Peninsula District) established 0.0% 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 California Water Service, San Carlos system (Mid-Peninsula District)

Your other pipe has a different answer

For the sewer lateral, San Carlos says:

It depends on one fitting. Put in an approved cleanout at your property line and get it accepted, and the City takes over the length from there out to the main - the part under the road, wye included. Without one, the whole lateral is yours.

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

Same trench, separate authorities, decided separately.

Who pays for the sewer lateral in San Carlos, 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.