In Mill Valley, the Sewer Lateral Inspection Goes With the Deed

Under Mill Valley's private sewer lateral rule, the seller is supposed to file a CCTV inspection report with the City Engineer before title transfers. The same sentence of the municipal code then covers what happens if that doesn't happen. The buyer files the report within 30 days of transfer and "shall be responsible for any needed repairs identified by such inspection."

That makes the rule a question of who pays. Escrow can close with the pipe uninspected. The obligation stays with the property and lands on whoever owns it next. Ordering the plumber therefore belongs in the negotiation alongside price and credits. It shouldn't be left as a line item for the final week.

The sentence that decides who pays

This is the transfer provision in Mill Valley Municipal Code §17.04.270(F)(2)(b). The city added it through Ordinance 1270 on March 2, 2015, and it is still in the code today:

Prior to transfer of title upon the sale of any real property, the owner shall provide to the City Engineer an inspection report... of the private sewer lateral; provided, however, that in the event such inspection report is not provided to the City Engineer prior to transfer of property title, the buyer of the property shall be responsible for providing the inspection report within 30 days after the transfer, and shall be responsible for any needed repairs identified by such inspection.

The full text is in the City of Mill Valley Municipal Code, Chapter 17.04.

Two more parts of that provision matter at the contract stage. Whether or not the report is filed, the seller has to tell the buyer in writing, before transfer, that the city requires inspection and repair of the sewer lateral. And the transfer trigger doesn't apply to sales in a common interest development, so a condominium sale falls outside this part of the rule.

Because the disclosure is mandatory, a buyer can't really be surprised by the rule's existence. What they can be surprised by is the condition of the pipe, and that's what the 30-day clause leaves open. If the seller files before close, any deficiencies show up while there's still a deal to adjust. If the buyer files after close, the same findings show up once the money has moved.

What the report sets in motion

Whoever files it, the report starts the same sequence under the code. Here it is in order:

1. A licensed plumber runs a CCTV inspection. The city's July 2026 report form asks for the completed form, a site-plan sketch, and the CCTV video or video log, all submitted to Public Works.
2. The plumber signs under penalty of perjury. The report has to identify any defects that could let water infiltrate, any connection that lets rainwater or groundwater into the lateral, and whether a backwater device is required and working. It must also certify that no unpermitted outdoor drain is connected to the city sewer.
3. The city charges a review fee. As of July 1, 2026, the Public Works fee schedule lists the sewer lateral inspection report review fee at $439.24, up from $428.53 the prior fiscal year. That's the city's charge, and the plumber's bill is separate.
4. The City Engineer responds within three business days with a determination and, where warranted, a notice to repair listing the specific deficiencies.
5. The repair clock is 180 days. Corrective work can mean replacing the lateral entirely and adding cleanouts and backwater valves where the city's standards call for them. If the repair needs a building permit, the owner has to get the permit and pass final inspection.

Compare this with the 30-day clause. If the report comes after closing, the new owner runs every step on this list, from hiring the plumber to closing out a permit. A seller who files before listing turns all of that into a known fact that both sides can price. Questions about the report or how to submit it go to Mill Valley Public Works at (415) 384-4800 or [email protected].

Exemptions run on paperwork

The code exempts a sale from the inspection in two cases:

• the lateral was installed or replaced within the 20 years before the property was listed for sale
• the lateral was inspected to city standards, or repaired under permit, within the three years before the inspection would otherwise be required

Neither exemption applies on its own. The owner has to prove it, using "a certificate, a paid bill or any documentation" that the City Engineer accepts as sufficient.

So a lateral replaced in 2010 only helps a 2026 seller if they can document it. If the documentation is a plumber's invoice that went out with a box of old files years ago, the pipe may be fine and the sale still needs an inspection. For an owner thinking about listing next spring, finding that paperwork is one of the cheapest bits of preparation available.

Some owners already have a report

Sales aren't the only trigger, and that's how some owners end up already holding a usable report.

Mill Valley also requires a lateral inspection before it issues a building permit for an addition or improvements worth $50,000 or more, counted cumulatively across projects over the prior three years. A third trigger is city roadwork. When the city plans an overlay or reconstruction directly above part of a private lateral, it notifies the owner, who then has to inspect on the city's schedule.

That has happened before. A City of Mill Valley notice dated September 1, 2022, told owners along a repaving project to have their laterals inspected by CCTV through a licensed plumber and repaired within 180 days if needed. The city waived report fees for that project. Under the three-year exemption, a qualifying inspection or permitted repair from a recent remodel or repaving notice can cover a sale that falls inside that window. Owners who renovated in the past few years may want to check their permit file before ordering a new camera run.

A Mill Valley address may not mean Mill Valley's code

All of the above describes the City of Mill Valley's rule, and it applies inside city limits. Plenty of homes with a Mill Valley mailing address sit in unincorporated areas served by separate sanitary districts. The city says so directly. In its FAQ, it tells owners who are selling or remodeling to "refer to the Sewer Lateral Ordinance in your sanitary district for current requirements." It also says homeowner responsibility for the lateral in unincorporated areas "may differ."

Inside city limits, the owner maintains the lateral all the way to the city main, including the section under the right-of-way and the fitting where it branches off the main. Outside those limits, start with the SASM agency boundaries map, which shows which district serves a given parcel.

Here's what we could confirm for each jurisdiction as of October 2026:

Homestead Valley's version spells out the buyer-seller split more explicitly. Under the district's lateral ordinance, the seller is responsible for the pre-sale inspection, and who pays for repairs is left to the buyer and seller. If the seller doesn't inspect, the district requires the new owner to inspect and make the necessary repairs. The repair deadline is 180 days after a district notice. As with the city's rule, an inspection that isn't done before closing becomes the buyer's job afterward.

For the three districts we couldn't confirm, the district itself is the right source, and it's worth asking before an offer goes in.

Short answers

Does Mill Valley issue a compliance certificate that escrow requires? Under the city code, the sale requirement is an inspection report filed with the City Engineer. A certificate isn't required to close. The Certificate of Compliance mentioned in SASM's Cash for Sewers materials belongs to that assistance program.

Is there financial help for repairs? SASM's Cash for Sewers program offers lateral assistance, and the city links to it from its Cash for Sewers page. The program packet we found is undated, so confirm current amounts and eligibility with the city before relying on them.

What does a repair typically cost? We didn't find a published local figure. The cost depends on what the camera finds, from a single defect up to a full replacement with cleanouts and a backwater valve. That's why having the report before pricing helps both sides.

Can an owner refuse to inspect? If an owner won't provide a required inspection, the city may run its own televised inspection at the owner's expense and issue a repair notice if it finds problems.

At Smith & Co., the lateral is part of the prep work we handle before a Mill Valley home goes on the market. We confirm which sanitary district serves the parcel, look for replacement or permit records that might qualify for an exemption, and schedule the plumber early enough that the report is something buyers price in rather than something they find out about later. If you're planning a sale and aren't sure where your pipe stands, Schedule a Free Consultation and we'll start with your permit file.

This article is general information, not legal, tax or financial advice. Consult a qualified professional about your situation.