Plumbing Mountain View

Mountain View plumbing between soft Hetch Hetchy water and the city main

In Mountain View the owner's pipe runs all the way to the city sewer main, so lateral work is split between a building permit on the house side of the property-line cleanout and a Public Works excavation permit beyond it. Every water heater installation or replacement needs a permit, like-for-like included. About 87 percent of the city's water is soft Hetch Hetchy supply, so pressure and old pipe matter more here than scale.

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Water supply
About 87% SFPUC Hetch Hetchy; the rest Valley Water and city wells
Hardness by zone (2023)
SFPUC zones 1-2: 10-30 mg/L; Valley Water zone 3: 75-120 mg/L
Sewer lateral
Owner's, from the house all the way to the city main
Water heater permit
Required for every installation or replacement

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Free to request, and you agree the scope and price with the person you hire before work starts. In California, a job over $1,000 in labor and materials, or one that needs a building permit, must be done by a contractor licensed by the CSLB in the right class. Ask for the license number and check it at cslb.ca.gov.

Mountain View City Hall
Mountain View City Hall. Photo: Aleh Haiko, CC BY-SA 3.0, via Wikimedia Commons.
Copper pipe fittings: elbows, a tee, reducers and couplings
Copper pipe fittings: elbows, a tee, reducers and couplings. Photo: Torsten Bätge, CC BY-SA 3.0, via Wikimedia Commons.

The houses here

Sixty-year-old laterals and the cleanout by the sidewalk

Mountain View's single-family neighborhoods were largely built in the 1950s and 1960s, so many sewer laterals and water services have been in the ground for sixty years or more. The city's lateral guidance says the cleanout is typically in the front yard, close to the front property line or the back of the public sidewalk, and that one fitting decides a lot: it is where the city's crews and a plumber's camera get into the lateral. A house without a property-line cleanout gets no courtesy cleaning from the city. In the slab-built Monta Loma Eichlers, heating pipe runs inside the concrete floor, so any leak hunt there starts with testing rather than a jackhammer.

The work

Calls that bring a plumber to a Mountain View house

  1. The camera run before a remodel permit

    For a new house, an ADU or junior ADU over 600 square feet, or additions and remodels that add up, within five years, to the cost of a 600-square-foot addition, the city wants the lateral filmed before it issues the building permit. A licensed plumber runs a color camera from the property-line cleanout to the main while a City Wastewater Inspector watches on site. Public Works reviews the video, keeps a copy and decides whether repairs come first. The inspection cannot be pushed to later in the job.

  2. Replacing a lateral on both sides of the cleanout

    Pipe on private property up to the property-line cleanout is replaced under a building permit; pipe from the cleanout to the city main is replaced under an excavation permit from Public Works, and a job that crosses the cleanout needs both. The cleanout itself can go under either. For a straight replacement in place, the city's online residential sewer permit expects a cleanout within 2 feet of the building and another at the property line, at least 12 inches of cover and a slope of a quarter inch per foot.

  3. Water heaters, tank or heat pump

    A like-for-like replacement in the same spot, between 30 and 150 gallons, can be permitted online without plans; moving the heater to a new location needs a regular permit with drawings. In a garage, the controls must sit at least 18 inches above the floor. A heat pump water heater can also be permitted online if it goes in the garage or an enclosed storage area and fits the house's existing electrical capacity; otherwise the panel is upgraded or a load management system added first.

  4. Repiping a house, and the ground rod that comes with it

    Mountain View permits a straight repipe online when existing interior or exterior water pipe is replaced with copper, galvanized steel, PEX or approved plastic, and faucets and valves stay where they were. New shower or tub-shower valves must be pressure balanced and limited to 120.5 degrees. Because new pipe can no longer serve as the house's only electrical ground, the permit also calls for a ground rod tied in at the panel. Moving fixtures, or repiping as part of a remodel, takes a regular permit.

Permits and local rules

City rules that decide the scope of a Mountain View plumbing job

  1. Sewer lateral inspection

    Mountain View requires the property-line cleanout and the lateral to the city main to be inspected for new single-family homes, ADUs and junior ADUs over 600 square feet, and additions or remodels whose cumulative cost over the last five years exceeds that of a 600-square-foot addition. It must be finished during plan review, before the permit is issued, with a City Wastewater Inspector present and a color camera. Repairs found are permitted by location: building permit before the cleanout, excavation permit after it.

    City of Mountain View (opens in a new tab)

  2. Who clears a blocked lateral

    City crews clear blockages in the city's sewer mains. Property owners are responsible for the house plumbing and the whole lateral that connects to the main, though where a property-line cleanout exists the city will, as a courtesy, clean from that cleanout to the main. The owner also answers for damage caused by a badly built lateral, including a missing backflow prevention device or an illegal hookup.

    City of Mountain View Public Works (opens in a new tab)

  3. A permit for every water heater

    The Building Division's water heater guide for one- and two-family homes requires a permit for all installations and replacements, obtained before work starts. It calls for two seismic straps, one in the top third and one in the bottom third at least 4 inches from the controls, a relief valve drained outside, and a pan with a drain where a leak could damage wood framing. Electric units must be heat pumps meeting the minimum Energy Factor in the guide.

    City of Mountain View Building Division (opens in a new tab)

  4. Like-for-like plumbing permits issued online

    Single-family homes and duplexes can get a building permit online, with no plans, for a sewer line or property-line cleanout replaced in place, a water piping replacement, a water service line from the house to the city meter, and a water heater in the same location. Each has limits: none is available when the work is part of a remodel or addition, and a new connection to the sewer main or a new water meter goes through the regular process.

    City of Mountain View Building Division (opens in a new tab)

State license for this work: C-36 Plumbing, C-42 Sanitation System. Look up a contractor's license on the CSLB website (opens in a new tab).

Before you hire

What to settle with a plumber before the trench opens

  • Ask whether the quote includes booking the City Wastewater Inspector for the camera run and handing the city a copy of the color video.
  • If the work crosses the property-line cleanout, ask who takes out the Public Works excavation permit; the city issues it only to a California licensed contractor.
  • Ask whether the plumber holds a current Mountain View business license, which the city checks before a contractor can sign for a permit.
  • For a water heater, ask whether it stays in the same spot and size range, which keeps it on the online permit, or needs drawings.
  • Look up the C-36 Plumbing license number at cslb.ca.gov before signing anything.

Questions

Questions Mountain View owners bring to a plumber

Who pays to clear the pipe between my cleanout and the street in Mountain View?

The lateral is yours all the way to the city main, so clearing it is your responsibility. If your property has a cleanout at the property line, the city will clean from that cleanout to the main as a courtesy. If water comes up through a drain while nobody is using the plumbing, the city main may be blocked, which is the city's to clear, so call Public Services.

Does Mountain View require a sewer lateral inspection when a house is sold?

The city's published triggers are construction projects: a new house, an ADU or junior ADU over 600 square feet, and additions or remodels that add up to the cost of a 600-square-foot addition within five years. A sale is not on that list. Buyers often order a camera inspection anyway, and if it finds a problem, the repair still needs the right permit.

Is Mountain View water hard enough to need a softener?

The city calls its water soft to moderately hard and says softeners are generally unnecessary. In its 2023 sampling, the SFPUC water serving zones 1 and 2 measured 10 to 30 mg/L as calcium carbonate, while Valley Water supply in zone 3 measured 75 to 120 mg/L. Ask a plumber which zone your street is in before buying equipment.

What water pressure should a Mountain View house expect?

The city says its system delivers an average minimum of 45 pounds of pressure, above the 25-pound floor the state sets for public water systems. A house reading well below that may have a problem in its own service line or old pipe, and one reading high may need a regulator. Have a plumber put a gauge on a hose bib before deciding.

Can I pull my own plumbing permit in Mountain View?

For a single-family home or duplex, yes: the owner can sign as an owner-builder, with the city's owner acknowledgement form and photo ID. Every other building permit must be signed by a California licensed contractor, and a Public Works excavation permit for work past the property-line cleanout is issued only to a licensed contractor.

Where these facts come from

Checked against these public sources in October 2026. Rules and programs change: confirm permit requirements with the city before work starts, and a contractor's license on the CSLB website.

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