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Who owns the water service line in Atherton, 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, Bear Gulch District's own statement.

Which part of the pipe is yours

your buildingproperty linesidewalkstreetmainSewer: yours to the mainWater: yours to the meter
The thick length is yours.

Where the responsibility divides

California Water Service, Bear Gulch 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:

Checked 2026-09-19

What California Water Service, Bear Gulch 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, Bear Gulch District has classified less of its network than most of California: 81.7% of its service lines are still unclassified, against 9.2% statewide.

Service lines reported
19,291
Still unclassified
15,760 (81.7%)

Across California, 9.2% of service lines are unclassified.

Where else this answer applies

California Water Service, Bear Gulch District also supplies one other place with a page here, and the statement above is the same one that governs it: Woodside. Each of them settles the sewer lateral separately, often under a different authority from this one.

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 Atherton's land inside the boundary it maps for California Water Service, Bear Gulch District. Measured 2026-09-11.
  • Unclassified means nobody has established what the pipe is made of. It does not mean lead was found.
  • 19,291 is the whole of California Water Service, Bear Gulch District's reported inventory, not this city alone. The State's file records no city for these lines, so they cannot be counted per city.
  • Classified does not mean inspected, and this system inspected less than most. California Water Service, Bear Gulch 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, Bear Gulch District

Your other pipe has a different answer

For the sewer lateral, West Bay Sanitary District gives the opposite answer to the one above:

The property owner owns the whole side sewer, from the building to the District's main - though the District may clear a blockage in the part under the road where the property has a conforming cleanout.

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

Same trench, separate authorities, decided separately.

Who pays for the sewer lateral in Atherton, CA

How this compares across California