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Who owns the water service line in Costa Mesa, 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 Mesa Water District about the water service line.

The documents this answer is built on

Who is responsible for which part

Mesa Water District owns the service connection through the meter, and the customer has everything past the customer control valve. Its Rules and Regulations provide that "Mesa Water's Point of Ownership shall end at the outlet side of the Customer Control Valve", and that "Mesa Water assumes no responsibility for the maintenance or operation of the Customer's Water System or facilities beyond the Point of Ownership." This is Mesa Water District's own statement.

Mesa Water District
The service connection, "including the tap, line, curb stop, meter and meter box supplied by and owned by the District". "Meters shall be maintained, repaired, replaced, and read by Mesa Water employees." The rules state the District's ownership of the service connection; they do not state a maintenance duty for the service line itself in terms.
The property owner
The customer's water system beyond the Point of Ownership - everything past the customer control valve, which is "installed on the outlet side of a Water meter."

What else is worth knowing

The line is the customer control valve just past the meter; where there is none, the outlet side of the meter or the control valve upstream of a backflow assembly. The State's register puts the District's area over nearly all of Costa Mesa; Irvine Ranch Water District's area covers about 5%, and its own rules apply there. Check the name on your water bill.

Sources

Mesa Water District, Rules and Regulations for Water Service (Resolution No. 1609, adopted 28 January 2026), sections 1.2 (definitions) and 2.5

Checked

What Mesa 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.

Mesa 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
25,358
Still unclassified
0 (0.00%)
Across California, 9.2% of service lines are unclassified.
Share of service lines still unclassified
  • Mesa 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.
  • The State's service area map puts 95% of Costa Mesa's land inside the boundary it maps for Mesa Water District. A share of land is not a share of homes: open space counts the same as a dense block. Measured 25 Sep 2026.
  • Classified does not mean inspected, and this system inspected less than most. Mesa Water District established 10.5% 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.
Mesa Water District: official site

Your other pipe: the sewer lateral

For the sewer lateral, Costa Mesa says:

Costa Mesa Sanitary District answers this more completely than most, and it answers the two things that usually go unsaid. Section 6.02.020 of its Operations Code provides that "the property owner shall maintain the lateral that connects to District's sewer main, including any portions that may lie within the public right of way or Costa Mesa Sanitary District easement". And the definition settles where that run ends: a lateral "is that entire underground pipe structure including the connection between the sewer main and the structural improvements on private property and shall include both the portion on private property and the portion in the public or District right of way". So the length under the road is yours, and so is the joint at the main.

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

Same trench, separate authorities, decided separately.

Who pays for the sewer lateral in Costa Mesa, CA

Look up a specific address

This page describes what applies to properties in Costa Mesa 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