Who owns the water service line in Tiburon, CA
Marin Water owns and maintains the service line from the main to and including the meter. The pipe from the meter to the building is the property owner's. This is Marin Municipal Water District's own statement.
Which part of the pipe is yours
Yours from the meter to your building
Why, and what to do
Where the responsibility divides
- Marin Municipal Water District
- The District states that "the service line leading to your property is owned and maintained by Marin Water, as is the water meter" - the run from the main in the street, and the meter itself.
- The property owner
- The District states that "the pipe that runs from the meter to your home belongs to you and is your responsibility", and answers the leak question directly: "you are responsible for any leaks on your side of the water meter. Your water service begins at your water meter."
What Marin Municipal Water 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.
Marin Municipal Water District has classified more of its service lines than most of California: 0.00% of its lines are unclassified, against 9.2% statewide.
- 63,060
- 0 (0.00%)
Where else this answer applies
Marin Municipal Water District also supplies 7 other places with a page here, and the statement above is the same one that governs them: Belvedere, Corte Madera, Larkspur, Mill Valley, San Anselmo, San Rafael and Sausalito. 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 74% of Tiburon's land inside the boundary it maps for Marin Municipal Water District. Within the same city limits it also maps "CSP - ANGEL ISLAND ST PARK" (26%). A share of land is not a share of homes: open space counts the same as a dense block. Measured 2026-09-11.
- 63,060 is the whole of Marin Municipal Water 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. 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.
Your other pipe has a different answer
The sewer lateral leaving your property is a separate pipe, run by a separate authority, and who is responsible for it is decided separately. In many places the two answers are opposites.
Sewer lateral requirements in Tiburon, CAHow 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.