Who owns the water service line in Belmont, CA
Which part of the pipe is yours
Yours from the meter to your building
Why, and what to doYours all the way to the main, including the fitting where it joins
Why, and what to do
If something’s wrong
Who to call first about the water service line
Who is responsible for which part
Mid-Peninsula Water District takes the pipes on the street side of the meter, and the owner the pipes past it. The District's answer to "Whose pipes are whose?" puts its own responsibility on the street side of the water meter, "including all service lines and water mains extending throughout the community", and says the property owner "is generally responsible for all pipes and plumbing" on the customer side of the meter. This is Mid-Peninsula Water District's own statement.
- Mid-Peninsula Water District
- The pipes on the street side of the meter, service lines included, and the meter: "The District is also responsible for the water meter itself".
- The property owner
- The pipes and plumbing on the customer side of the meter.
What else is worth knowing
Sources
Mid-Peninsula Water District, Frequently Asked QuestionsWhat Mid-Peninsula Water District reported to the State about service-line materials
Federal rules required every community water system to inventory its service lines and publish the result. These are the figures this one filed.
The inventory records what each line is made of: lead, galvanized requiring replacement, non-lead, or lead status unknown. “Still unclassified” counts the lines whose material has not been identified. It does not mean they are lead.
Mid-Peninsula Water District has classified more of its service lines than most of California: 0.00% of its lines are unclassified, against 9.2% statewide.
- 8,164
- 0 (0.00%)
What this page cannot 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 99% of Belmont's land inside the boundary it maps for Mid-Peninsula Water District. Within the same city limits it also maps "CALIFORNIA WATER SERVICE - SAN MATEO" (1%). Measured 25 Sep 2026.
- 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 4 Sep 2026. They may not reflect its current inventory - ask the water system to confirm anything about a specific address.
Your other pipe: the sewer lateral
For the sewer lateral, Belmont gives the opposite answer to the one above:
Belmont puts every portion of the lateral on the owner, the connection to the main included. Section 21-210 provides that "A property owner must install and maintain in good repair all portions of the sewer lateral servicing his or her property including the connection of the lateral to the public sewer main and any back flow prevention devices or cleanouts required by this chapter or chapter 7."
Your sewer lateral is yours to the main, fitting included; your water line stops being yours at the meter.
Who pays for the sewer lateral in Belmont, CALook up a specific address
This page describes what applies to properties in Belmont in general. To see which authorities serve one address, and what records exist for it, search for it.
Search for an addressHow 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.