Who is responsible for the sewer lateral in South San Francisco, CA?

Who pays for the sewer lateral in South San Francisco, CA

Which part of the pipe is yours

Sewer lateral
Yours from the cleanout to your building — if certain conditions are met
Why, and what to do

The thick length is yours. A dashed marker means the position depends on your property — see below.

If something’s wrong

If a repair needs a permit or an inspection

No rule on file here is specific to a repair; that does not mean none exists.

Buying or selling?

When you sell · Certificate
South San Francisco requires the lateral to be inspected and put right before an older property is sold. Section 14.14.190(d) provides that "Whenever any property is to be transferred to or vested in any other person or entity due to a sale, and that property includes any buildings or structures constructed more than twenty-five years prior to the date of transfer or vesting, the sewer lateral(s) to that property shall be tested for infiltration, and all necessary repairs or replacements performed to prevent all infiltration." For a home, the owner has the lateral video-inspected at their own expense; "All repair or replacement work shall be approved by the city prior to the transfer of title", after which the City issues a certificate of compliance.

The sale rule in full, with its sources

Planning work?

No rule on file here is specific to remodelling or adding a unit; that does not mean none exists.

Who to call first about the sewer lateral

BelowGrid has no first-call guidance on file from South San Francisco about the sewer lateral.

South San Francisco: official site(opens in a new tab)The documents this answer is built on

Who is responsible for which part

Where the City of South San Francisco collects the sewage, the dividing point is a cleanout in the right place. Section 14.14.040 of the municipal code provides that "The city shall maintain the building sanitary sewer lateral from a city-approved cleanout wye to the city sanitary sewer main when a cleanout is provided either in the sidewalk, or if there is no sidewalk within the public right-of-way then it shall be installed within two and one-half feet of the city main or in such a location as approved by a city issued permit." Without such a cleanout the owner keeps the whole run, to and including the wye on the main.

South San Francisco: The lower lateral, from a city-approved cleanout wye to the main, where the cleanout is in the sidewalk, within two and one-half feet of the face of curb or edge of pavement where there is no sidewalk, or in a side or rear yard within two and one-half feet of the City main. Section 14.14.120(c) provides that "The city shall only maintain the building sanitary sewer lateral from the cleanout wye, inclusive of the cleanout wye, to the city sanitary sewer main" in those circumstances. Section 14.14.120(b) speaks of the "lower lateral sewer lines in the sanitary sewer system owned by the city".
The property owner: Everything from the building to the cleanout wye - or to the main, where there is no qualifying cleanout. Section 14.14.120(a) has the owner, at the owner's expense, maintain the building drain, the lateral "to the cleanout wye connection or to the city sanitary sewer main as provided below", the building cleanout, the sidewalk cleanout frame and cover, and backflow protection and relief equipment, and makes the owner "responsible for clearing all obstructions in the building sanitary sewer lateral immediately upon discovery or notification by the city". Under section 14.14.120(b) the owner also removes roots growing from the private lateral into the City's lower lateral within thirty days of the City's notice.

What decides which applies

The cleanout decides it. "When the cleanout is located outside of these designated areas, the property owner is responsible for maintaining the building sanitary sewer lateral all the way to the city sanitary sewer main including the building sanitary sewer lateral's wye junction to the main." A new cleanout does not hand the street length over by itself: the owner has that length video-inspected, repairs any defect the City finds under a City encroachment permit, and "The city will accept maintenance responsibility for the section of the lateral from the new cleanout to the main only after the following conditions have been met", ending with a certificate of compliance. Which body collects your sewage matters too, because two bodies collect sewage inside South San Francisco. The City's collection system, under section 14.14.030, excludes "those facilities that are part of the Westborough Water District and the private laterals which are connected and flow to that system". The District "owns the water and sanitary sewer system which serves the Westborough area of South San Francisco", about one square mile west of Interstate 280 towards Skyline Boulevard, and has it maintained under contract by the North San Mateo County Sanitation District. For lateral repairs it tells owners to follow its specifications "and not the ones issued by the City of South San Francisco", and issues its own sewer lateral repair permit. Its 2025 Sewer System Management Plan puts the whole lateral on the owner: "The District has no responsibility for the private sewer laterals from the building to the WWD public sewer main. The entire lateral is the responsibility of the private property owner." The City's cleanout arrangement does not reach those laterals. The District's website maps its service boundary; if your property is inside it, the District's terms apply rather than the City's.

Sources

South San Francisco Municipal Code section 14.14.040, Building drain and building sanitary sewer lateral

Also quoted:

Checked 26 Sep 2026 (5 weeks ago)

What the rules say

Most relevant if you have received a notice from the city or district

No rule on file here is specific to a notice from the city or district; that does not mean none exists.

Also in force here

When you sellCertificate
South San Francisco requires the lateral to be inspected and put right before an older property is sold. Section 14.14.190(d) provides that "Whenever any property is to be transferred to or vested in any other person or entity due to a sale, and that property includes any buildings or structures constructed more than twenty-five years prior to the date of transfer or vesting, the sewer lateral(s) to that property shall be tested for infiltration, and all necessary repairs or replacements performed to prevent all infiltration." For a home, the owner has the lateral video-inspected at their own expense; "All repair or replacement work shall be approved by the city prior to the transfer of title", after which the City issues a certificate of compliance.
What to do: If you are selling in South San Francisco, ask the City's engineering division whether a certificate of compliance is already on file for the property. If not, have a licensed contractor video-inspect the lateral early and send the video, the City's inspection report form and the certificate application to the City, so any repair is approved before escrow closes. If your sewer bill comes from the Westborough Water District, confirm with the City that the exemption applies.
Why this matters
The City's fact sheet puts the start date plainly: "All listing agreements in contracts as of June 21, 2022 must obtain a sewer lateral certificate of compliance prior to the transfer of the property title." The code lists exceptions that turn on facts about the property: condominium and cooperative buildings and their units (except on conversion), a property that shares a lateral with another, a transfer with no county transfer tax, ten years after an accepted test or permitted alteration, and twenty-five years after a complete replacement. The fact sheet adds that properties served by the Westborough Water District are exempt. Missing the certificate does not void the sale - the code says the requirement "in no way affects the legality of the transfer of title" - but if the certificate cannot be obtained before the sale closes, the owner, buyer or agent may apply in writing for a time extension of up to 180 days, with $10,500 posted into an escrow account that may be forfeited if the work is not done in time, and the new owner inherits any remaining work.
In force since 21 Jun 2022 · Checked 26 Sep 2026 (5 weeks ago)
South San Francisco Municipal Code section 14.14.190, Additional events triggering the requirement to obtain a certificate of compliance
Also quoted:

What this page cannot tell you

No assistance or grant programme has been reviewed for this jurisdiction yet.
No sewer service territory has been mapped for this area, so BelowGrid cannot say who serves an individual address.

Who governs and serves this area

Jurisdiction: South San Francisco (municipality)
Sewer service: No map of sewer providers is held here. BelowGrid cannot say which sewer provider serves an individual address.

How this compares to neighbouring cities

7 of the 8 nearest cities draw the line somewhere else. Each authority publishes only its own rule.

South San Francisco(this page)
the cleanout (conditions apply)
San Brunoabout 5 mi
the main, including the connection fitting on the main
Colmaabout 6 mi
the main
Daly Cityabout 7 mi
the main
Pacificaabout 8 mi
the main, including the connection fitting on the main
Millbraeabout 5 mi
the cleanout (conditions apply; see that page)
Burlingameabout 5 mi
the main (conditions apply; see that page)
San Mateoabout 7 mi
the main, including the connection fitting on the main
Hillsboroughabout 7 mi
the main, including the connection fitting on the main

Distances are approximate, in a straight line between the places’ centres.

Compare the rules city by city

Nearby cities and further reading

Look up a specific address

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

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