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Who owns the water service line in Clayton, CA

Which part of the pipe is yours

your buildingproperty linesidewalkstreetmain
The thick length is yours.

If something’s wrong

Who to call first about the water service line

BelowGrid has no first-call guidance on file from Contra Costa Water District about the water service line.

The documents this answer is built on

Who is responsible for which part

Contra Costa Water District lays the water service line from its main to your meter and charges the applicant for it, and it installs, sets and maintains the meter. Where that meter sits is settled by the District's own standard drawing, approved for use in August 2024: at the back of the curb or the back of the sidewalk, with everything past it marked "PRIVATE SYSTEM" on its meter sheets. Bear in mind what that drawing is - a standard for what gets built now, rather than a statement about a service laid decades ago. What no CCWD document says is who repairs the pipe between the main and the meter - so that is the question to ask before you need the answer. This is Contra Costa Water District's own statement.

Contra Costa Water District
The meter, stated; the service line, installed but not spoken for. CCWD's Code of Regulations provides that "CCWD shall install, set, and maintain a meter on each active water service connection", and charges a new applicant "a service line charge to cover CCWD's costs of installing a service line from the main adjacent to the property to be served". Where CCWD's own operations require a connection to be moved, section 5.08.050 does the work "without cost to the customer served by the connection". The Code states no ownership of the service line and no duty to repair it.
The property owner
Everything from the meter into the building. CCWD's Standard Detail SD-4, approved for use in August 2024, places the meter box at "BACK-OF-CURB OR BACK-OF-SIDEWALK" on every sheet, and on its meter sheets marks the run downstream of the meter "PRIVATE SYSTEM". The Code adds that each water user "shall bear the risk of loss, and shall be responsible for the carriage, control, handling, storage, distribution and use of all water furnished by CCWD from and beyond the point of delivery", and the District's leak adjustment requires that "the customer promptly repaired all known or apparent water leaks beyond the point of delivery by CCWD". Section 5.04.050 puts that point at "the discharge side of CCWD's meter or backflow prevention device".

What else is worth knowing

One thing here is settled and one is not, and knowing which is which is worth more than a confident answer. Settled: the meter sits at the back of the curb or the back of the sidewalk, and the District's own construction standard marks everything past it as your private system. So the run across your garden to the house is yours, and CCWD keeps up the meter itself. Not settled: who repairs the service line between the main and that meter. CCWD installs it and bills the applicant for installing it, and no document that could be found - not the Code of Regulations, not the customer pages - says who owns that pipe afterwards or who pays when it fails. The Code makes you responsible "from and beyond the point of delivery", and section 5.04.050 fixes that point: "The point of delivery of water delivered by CCWD by pipe shall be the discharge side of CCWD's meter or backflow prevention device." That settles the run past the meter; it says nothing about the pipe before it. Do not read the District's duty to maintain the meter as an answer: elsewhere in California the same fact goes both ways, with one district keeping the pipe to the property line and another disclaiming every inch past the meter. If a leak is between the main and your meter, ask CCWD who is repairing it before you engage anybody, and get the answer in writing. One thing that is written down: CCWD offers optional HomeServe cover for "customer-owned utility equipment" including an exterior water line, which tells you a customer-owned exterior line exists and still does not say where it starts.

Sources

Contra Costa Water District Code of Regulations, Title 5 - Water Supply and Rates

Also quoted:

Checked

What Contra Costa 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.

Contra Costa Water District 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
60,823
Still unclassified
0 (0.00%)
Across California, 9.2% of service lines are unclassified.
Share of service lines still unclassified
  • Contra Costa Water District0.00%
  • California9.2%

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.
  • 60,823 is the whole of Contra Costa 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, and this system inspected less than most. Contra Costa Water District established 2.8% 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 4 Sep 2026. They may not reflect its current inventory - ask the water system to confirm anything about a specific address.
Contra Costa Water District: official site

Where else this answer applies

Contra Costa Water District also supplies the place below, and the statement above governs it too:

It settles the sewer lateral separately, often under a different authority from this one.

Your other pipe: the sewer lateral

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 Clayton, CA

Look up a specific address

This page describes what applies to properties in Clayton in general. To see which authorities serve one address, and what records exist for it, search for it.

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How this compares across California