Who pays for the sewer lateral in Mountain View, CA

Who is responsible for which part

The whole pipe is yours, out to the City main. The code defines a sewer lateral as running "to the point of connection to the city-owned sewer main" and says "each sewer lateral is owned by and is the responsibility of the entity that owns the property". If you have a cleanout at your property line the City will clear a blockage in the outer half free - it calls that "a courtesy", not a share of the pipe. One caution: a different section of the same chapter says the City "will maintain and keep in repair every such service connection", and the code never reconciles the two.

The property owner

Everything from the building to the City's main. Section 35.29 defines a sewer lateral as "the sewer piping used to convey sewage from a building or facility on a parcel (private or public property) to the point of connection to the city-owned sewer main", and provides that "each sewer lateral is owned by and is the responsibility of the entity that owns the property or facility from which that sewer lateral conveys sewage or wastewater". The same section says of a building sewer that "the property owner is responsible for maintenance and repair" of it. Section 35.10 states the duty in money: owners "shall keep their service pipes, stopcocks, service lines, sewer lateral, plumbing, and all apparatus connected therewith, in good repair at their own expense".

What else is worth knowing

Nothing in the code splits the pipe, and one sentence in it appears to. Taking those in turn. What a property line cleanout changes is what the City will come out and do: its Public Works FAQ says that "if the lateral has a property line cleanout, the City as a courtesy will clean the lateral from the property line cleanout to the sewer main", while "property owners are responsible for clearing any blockages in the home's plumbing system and the lateral pipeline that connects to the City's sewer main". So ring the City before you ring a plumber, and understand that the free visit is a service and not a smaller share of the pipe. Now the caution. Section 35.40 of the same chapter says "the city will maintain and keep in repair every such service connection, provided the failure of such service or the injury thereto rendering repairs necessary was not caused by the improper act or omission of the owner or tenant served by such connection". That sits in the article about connections the City installs, where section 35.36 provides that "each sewer connection shall include opening the sewer and sewer pipe to curb line" - so it most likely means the City-built connection rather than the lateral defined elsewhere. The code does not say so, the sections come from different ordinances a year apart, and nothing cross-references them. If somebody quotes section 35.40 at you, they are quoting the code correctly; ask Public Works which of the two governs your address before you spend anything on the strength of it.

Checked 2026-09-15

What is required

• When you remodelInspection

  Building work in Mountain View can require a camera inspection of your sewer lateral before the City will issue the permit. It applies to "a new accessory dwelling unit (ADU) or junior accessory dwelling unit (JADU), if greater than 600 sq. ft. in size", a new single-family home, "an addition(s) and/or remodel(s) that cumulatively exceeds an equivalent cost of a 600 sq. ft. addition to an existing single-family home within the last 5 years", and commercial tenant improvements on the same cumulative test. The City is explicit that "the inspection must be completed during review of your building plans and prior to the City issuing a building permit to begin construction" and "cannot be deferred to a later date".

  What to do: Ring the Wastewater Supervisor on 650-903-6329 before your plans go in, and ask two things: whether your project crosses the cumulative threshold, and what the equivalent cost of a 600 square foot addition is this year. If it does, book the inspection early - a City Wastewater Inspector has to be on site with your plumber, the camera has to be colour, and the City keeps the video and decides from it whether repairs are required.

  Why this matters▸▾

  Two things make this one worth reading before you draw plans rather than after. The trigger is CUMULATIVE over five years, so a kitchen, a bathroom and a deck can reach it when none of them would on its own - and the measure is the cost equivalent of a 600 square foot addition rather than a published figure, so it moves and you have to ask what it is. And the inspection is a gate rather than a condition: it happens during plan review and the City says it cannot be deferred, so a lateral that turns out to need work turns into a delay at the start of the project instead of a surprise at the end. What the camera is looking at is yours either way - the code makes the whole lateral the owner's out to the main.

  In force since 2026-09-15 · Checked 2026-09-15

  City of Mountain View, Sewer Lateral Inspection

  Also quoted:

  • City of Mountain View, water and sewer frequently asked questions

Who governs and serves this area

Jurisdiction

Mountain View (municipality)

Sewer service

• Union Sanitary District
• Which provider serves a particular address depends on where it is. Look up an address to resolve it.