Who pays for the sewer lateral in Palo Alto, CA

Who is responsible for which part

It depends on whether you have a City sewer cleanout, and where it is. With one, Palo Alto owns and maintains the lateral "from the Wastewater Main up to and including the first City Sewer Cleanout" and you own the rest to your building. Without one - or if it is inaccessible, or if the cleanout is yours and sits "more than 5 feet behind the property line" - you own "the entire Sewer Lateral between the City's Wastewater Main and the building".

Palo Alto

The lower portion only, and only where a City Sewer Cleanout is present and accessible. Rule and Regulation 23 says the City owns that length and is responsible for its "inspection, maintenance, repair, and upgrade", and identifies it as the "lower portion of the Sewer Lateral (also known as Lower Sewer Lateral or City Lateral) from the Wastewater Main up to and including the first City Sewer Cleanout". Where the City's wastewater main runs inside a Public Utility Easement across private property that shrinks further, to "the Wastewater Main located within the Easement" and nothing else.

The property owner

The upper portion where there is a City cleanout, and the whole run where there is not. With one, the Customer "owns and is responsible for the inspection, maintenance, repair, and upgrade of the upper portion of the Sewer Lateral" from that cleanout to the building. Without one, "the Customer owns and is responsible for the inspection, maintenance, repair, and upgrade of the entire Sewer Lateral between the City's Wastewater Main and the building being served on the Premises" - and the regulation spells out what that means when it goes wrong: "the City is not responsible for damage resulting from sewage backups caused by lack of Sewer Lateral maintenance". A lateral that branches off the City's lower lateral is the Customer's too, including "the tee or wye connection to the City Lateral".

What decides which applies

Three things, and you can change one of them. First, whether a City Sewer Cleanout exists on your lateral; the standard place for one is the planting strip. Second, whether it is accessible - the regulation puts "Keeping the Sewer Cleanout boxes visible and accessible" on the Customer's own list of duties, so a cleanout buried under a hedge is a cleanout that has stopped dividing the pipe. Third, where it is: if the cleanout is the Customer's rather than the City's and sits "more than 5 feet behind the property line", the City's half does not begin at all. The one you can change is the first. Where there is no City cleanout the City may install one, and "once a new City Sewer Cleanout is installed and operational, the City will own the Lower Sewer Lateral between the Wastewater Main and the new City Sewer Cleanout". Refusing that installation has a price: the Customer then "will remain solely responsible for the inspection, maintenance, repair, and upgrade of the entire Sewer Lateral". Two situations sit outside all of this. If the City's main is in a Public Utility Easement on private property, the whole lateral is the Customer's from the main connection inward. And if your lateral branches off the City's lower lateral rather than reaching the main itself, the tee or wye and everything above it is yours.

Checked 2026-09-15

What is required

• Any timeWork required

  Palo Alto puts two duties on every customer, and the first one decides how much pipe is yours. Rule and Regulation 23 requires "keeping the Sewer Cleanout boxes visible and accessible" - and the same regulation gives the City a share of the lateral only where a City Sewer Cleanout is present and accessible, so a buried or blocked one leaves you owning "the entire Sewer Lateral between the City's Wastewater Main and the building being served on the Premises". The second duty is "installing an approved backwater valve in accordance with the latest adopted version of the California Plumbing Code", to protect fixtures on "floor levels that are considered ground level or lower".

  What to do: Find out whether there is a City sewer cleanout on your lateral and whether it is clear - it is usually in the planting strip between the pavement and the road. If there is not one, ask City of Palo Alto Utilities on 650-566-4501 whether it will install one, because the regulation says that once it is in and working the City owns the lateral from the main up to it. Then ask your plumber whether the fixtures on your lowest floor are protected by a backwater valve.

  Why this matters▸▾

  Most cities treat a cleanout as access. Palo Alto treats it as the boundary, and then asks you to keep it accessible - so the same hedge that hides it can move the line between your pipe and the City's by the length of a front garden. That is the difference between a repair under your lawn and a repair under the road. The backwater valve is the other end of the same problem: where the lateral is yours and it blocks, the regulation is explicit that the City "is not responsible for damage resulting from sewage backups caused by lack of Sewer Lateral maintenance", and a valve is what keeps a blockage in the pipe rather than in the house.

  In force since 2019-10-21 · Checked 2026-09-15

  City of Palo Alto Utilities, Special Wastewater Utility Regulations, Rule and Regulation 23, issued by the City Council, effective 21 October 2019
• When you remodelWork required

  Building work in Palo Alto can put the utility's own side of both pipes on your bill. For water, Rule and Regulation 21 makes the customer responsible for replacing a service of 2 inches or smaller that is "not polyethylene or copper when building a new structure or constructing additions/remodels that have a value greater than $200,000 for residential projects or greater than $300,000 for commercial projects" - and the replacement runs "from the main up to and including the Water Meter box". For sewer, Rule and Regulation 23 provides that where a project forces the lower lateral to be "realigned and reconnected to the Wastewater Main at a new location", the customer pays "the cost of replacing the Lower Sewer Lateral from the Wastewater Main up to and including the City's Sewer Cleanout, and for installing a City Sewer Cleanout if one was not present".

  What to do: Before the plans are final, ask two questions of City of Palo Alto Utilities on 650-566-4501. First, what material and size your existing water service is - if it is 2 inches or smaller and is not polyethylene or copper, and the project value is over the threshold, replacing it from the main to the meter box is yours. Second, whether the project will require the lower sewer lateral to be realigned to a new connection at the main. Get both answers in writing and put them in the budget rather than discovering them at inspection.

  Why this matters▸▾

  These are the lengths of pipe the City looks after on an ordinary day, in the street, under the pavement - and a remodel can move them onto your side of the ledger. The water threshold is a published figure rather than a judgement call, so it is one of the few requirements a homeowner can check against their own project before they commit. The sewer half has no figure and turns on whether the work forces the lower lateral to move, which is a question for whoever is drawing the plans rather than for the owner. There is a consolation in it: a project that pays for a new City sewer cleanout buys a permanently shorter pipe to be responsible for, because under the same regulation the City owns the lateral from the main up to that cleanout.

  In force since 2019-10-21 · Checked 2026-09-15

  City of Palo Alto Utilities, Special Water Utility Regulations, Rule and Regulation 21, effective 1 June 2026

  Also quoted:

  • City of Palo Alto Utilities, Rule 23

Who governs and serves this area

Jurisdiction

Palo Alto (municipality)

Sewer service

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