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Who owns the water service line in Ontario, 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

Ontario Municipal Utilities Company (909) 395-2678

When to call: a water leak

Hours, after-hours and sources

Who is responsible for which part

Who to call first

Ontario Municipal Utilities Company

When to call: a water leak

(909) 395-2678

Ontario PD Dispatch: (909) 986-6711

Source

The City's own utility maintains the pipe from the main to the meter, sets and maintains the meter, and owns what it takes over. Section 6-8.830(a) provides that "The Municipal Utilities Company shall maintain the service connection extending from the water main to the meter", and that "The applicant shall install and maintain all pipes and fixtures extending or lying on the outlet side of the meter, excluding a City provided shutoff valve, twelve (12)-inch brass nipple and coupling". This is Ontario's own statement.

Ontario
The service connection from the water main to the meter, the meter itself, and a short run of fittings just past it. Section 6-8.830(a) provides that "The Municipal Utilities Company shall set and maintain a meter on each service connection", and keeps on the City's side the shutoff valve, the twelve-inch brass nipple and the coupling on the outlet of the meter. Section 6-8.829 settles ownership: "Title to all water facilities, whether installed by the City or a developer, shall be vested in the City upon completion of all work, testing, chlorination, inspection and acceptance for use".
The property owner
Everything on the outlet side of the meter beyond those City fittings, and section 6-8.830(b) states the other half of the line without qualification: "The City assumes no responsibility for the maintenance and operation of a customer's water system beyond the service connection and point of ownership by the City". The definition in section 6-8.803 fixes where that is - service connections "shall terminate at the customer side of the meter and meter box located at a specified place approved by the City".

What else is worth knowing

The handover is a few inches past the meter, not at its face, and that is worth knowing if a leak is right there: the shutoff valve, the twelve-inch brass nipple and the coupling on the outlet side are the City's, so a failure in those fittings is the City's to fix rather than your plumber's. Two things move cost back onto you. The City maintains the meter, but "the customer or owner shall be held liable for any damage to the meter due to his or her negligence"; and the angle curb stop on the inlet side is "intended for the exclusive use of the Municipal Utilities Company to control the water supply through a service connection", so damage to it from your use falls on you. Use your own shutoff instead. And before relying on any of this, check the name on your water bill: the Cucamonga Valley Water District serves a small part of the city, and if it bills you, its own rules govern your service rather than these sections.

Sources

Ontario Municipal Code section 6-8.830, Service connection maintained by Municipal Utilities Company, in Title 6 chapter 8D, Potable Water Facilities

Also quoted:

Checked

What Ontario 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.

Ontario 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
39,390
Still unclassified
0 (0.00%)
Across California, 9.2% of service lines are unclassified.
Share of service lines still unclassified
  • Ontario0.00%
  • 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 97% of Ontario's land inside the boundary it maps for the city's own water system. 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.
Ontario: official site

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 Ontario, CA

Look up a specific address

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

Search for an address

How this compares across California