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Who owns the water service line in Half Moon Bay, CA

Which part of the pipe is yours

  • Water service line

    Yours from the meter to your building

    Why, and what to do
  • Sewer lateral

    Yours all the way to the main under the road — if certain conditions are met

    Why, and what to do
your buildingproperty linesidewalkstreetmain
The thick length is yours. A dashed marker means the position depends on your property — see below.

If something’s wrong

Who to call first about the water service line

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

The documents this answer is built on

Who is responsible for which part

In Half Moon Bay, Coastside County Water District owns and maintains the service connection from its main to the meter, and the pipe past the meter is the customer's. The District's General Regulations define the service connection as "an assembly consisting of the District-owned pipeline from the water main to the outlet side of the water meter, the meter box, fittings, and water meter", and provide that "Said meters and service connections shall be maintained, repaired and renewed by the District when rendered unserviceable through ordinary wear and tear". This is Coastside County Water District's own statement.

Coastside County Water District
The service connection: the pipeline from the main to the outlet side of the meter, the meter box, the fittings and the meter. The regulations provide that "All service connections and meters shall be and remain the properties of the District and shall not be altered or moved by anyone other than an authorized employee of the District." The District repairs and renews them when they wear out in the ordinary way.
The property owner
The pipe on the customer's side of the meter. The regulations require that "The owner of the property to be served shall install a control valve on the pipe between the District meter and the first fixture outlet on the premises", and where an unusually high bill comes from a leak on the customer's side of the meter, "it shall remain the responsibility of the customer." In high-pressure areas the customer must also fit and maintain a pressure regulator on the service line on the property. Separately, the regulations limit the District's liability: it is not responsible "for broken or damaged pipes beyond the District meter".

What else is worth knowing

The line is the outlet side of the meter: the meter, its box and the fittings up to that point are the District's. The District's repair duty covers ordinary wear and tear; where a repair to the service or the meter is made necessary "by the act or negligence of the customer, his family or employee", the regulations provide that "any expense connected with said adjustment, renewal or repair shall be charged to and collected from the customer." The State's register puts the District's system over about 82% of Half Moon Bay's land and no other system over any of it; the rest, about 18%, is ground inside the city limits that no published water service area reaches - not a rival utility, and not necessarily unserved. Check the name on your water bill.

Sources

Coastside County Water District, General Regulations Regarding Water Service (June 10, 2025)

Also quoted:

Checked

What Coastside County 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.

Coastside County 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
7,710
Still unclassified
0 (0.00%)
Across California, 9.2% of service lines are unclassified.
Share of service lines still unclassified
  • Coastside County 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 82% of Half Moon Bay's land inside the boundary it maps for Coastside County 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. 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.
Coastside County Water District: official site

Your other pipe: the sewer lateral

For the sewer lateral, Half Moon Bay gives the opposite answer to the one above:

Where the City of Half Moon Bay collects the sewage, the owner keeps the lateral all the way to the City's main, including the length under the street. Section 13.12.110 of the municipal code defines the lateral sewer as "the portion of a sewer located within a public street connecting a building sewer to the main sewer, the ownership, and responsibility for all maintenance, repairs and replacement of which lies with the owner of the property it serves". The City's 2026 sewer system management plan says the same from the other side: "the City does not own or have operation responsibilities for sewer laterals".

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 Half Moon Bay, CA

Look up a specific address

This page describes what applies to properties in Half Moon Bay 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