You close on a Craftsman in the Yolanda neighborhood on a Tuesday. The champagne is poured, the movers have already come and gone, and by Thursday you're arranging furniture in a house with good bones and a mail slot that still says the previous owner's name. Then, sometime in the following weeks, a letter arrives from a sanitary district you've never heard of, addressed to you, with a deadline attached.

That letter is not a mistake. It is Ross Valley Sanitary District doing exactly what its own ordinance says it will do, and it is the first sign that in San Anselmo, closing escrow and finishing your diligence are two different events. The paperwork that actually shapes a sale here, the sewer lateral certificate, the flood disclosure, the wiring history, is built to travel with the property past the closing table rather than stop at it. Sellers who don't understand that distinction leave money on the table. Buyers who don't understand it get surprised by a compliance clock they didn't know was running.

In the three months ending June 2026, San Anselmo homes sold at a median of $1.6 million, typically inside three weeks of listing. That pace does not leave much room to sort out district jurisdictions and code sections after you've already written an offer. It's worth knowing the order of operations before you're in it.

The Sewer Lateral Rule Nobody Explains Up Front

Most of San Anselmo, along with Fairfax, Ross, Larkspur, and unincorporated pockets like Sleepy Hollow, Kentfield, and Greenbrae, sits inside Ross Valley Sanitary District. RVSD's Private Sewer Lateral Ordinance took effect in 2014, with the sale requirement following in January 2015, and it has one very specific trigger: any time a property changes hands, the owner must obtain a Certificate of Compliance. The same requirement kicks in for a remodel over $75,000 or the addition of a bathroom.

Here's the part that catches people off guard. The certificate does not have to be in hand before you close. RVSD gives the responsible party 90 days after close of escrow to reach compliance, and buyer and seller are free to negotiate who that responsible party is. A seller can list, accept an offer, and close without ever running a camera down the line, so long as the obligation and its cost get addressed in the contract. That's a fundamentally different situation than a pass-fail inspection contingency, and it changes how you should be negotiating.

A pressure test is the real test, not a camera inspection alone. The line has to perform like new. Many of San Anselmo's laterals are original to homes built before 1940, running clay tile or early cast iron under a foundation and a front yard that has seen a century of tree roots. A lateral that has never been replaced is a real possibility on this housing stock, not an edge case.

RVSD has also sweetened the incentive to get ahead of it. In April 2026 the district's board approved raising its lateral-replacement grant to as much as $3,000, and its loan program can provide up to $60,000 for qualifying complex projects. A full replacement earns a 20-year compliance certificate, so a seller who replaces the line now is also handing the next owner two decades of paperwork they'll never have to think about.

There is one more wrinkle worth knowing before you assume a neighbor's clean certificate says anything about your own line. Some older San Anselmo properties still run on a common lateral, a single private pipe shared by more than one house. RVSD's rules put the maintenance burden on whichever owner sits furthest downstream, and common laterals don't qualify for grant or loan money unless the owners disconnect and build separate lines to the main. If you're buying a home on a street with older, closely spaced houses, ask the question directly rather than assuming your lateral is yours alone.

The Flood Disclosure Isn't the Same as Flood Insurance

San Anselmo Creek runs through downtown, and it has flooded before, most memorably on New Year's Eve in 2005, when the water rose high enough to put much of the Ross Valley, including the downtown commercial strip, under water. Sleepy Hollow Creek carries its own flood history through the Morningside neighborhood on the other side of town. Neither is a rare event driven by one freak storm. The Ross Valley's clay soils and narrow topography make it one of the more flood-prone pockets in the region, a reality the town's public works department has been managing for decades through bridge upgrades, a detention basin at Memorial Park, and a running Capital Improvement Plan.

None of that history is hidden from a buyer. California requires a Natural Hazard Disclosure report on every home sale, and the Special Flood Hazard Area is the first item listed on it. San Anselmo layers its own requirement on top: under the town's municipal code, a seller must also obtain a resale inspection report from the Town Building Inspector before the sale, a document that is standard practice here rather than an optional add-on.

A flood disclosure and a flood insurance policy are two separate documents, and a 2021 assessment by the town found that only about 40 percent of the roughly 560 buildings mapped inside San Anselmo's Special Flood Hazard Area actually carried flood insurance at the time.

That gap matters if you're buying. Flood insurance is mandatory for homes in the mapped hazard zone with a federally backed mortgage, but the disclosure alone tells you the risk exists, not what it will cost to insure against it. Get a quote before you remove contingencies, not after.

Sleepy Hollow's Zip Code Trick

Sleepy Hollow shares San Anselmo's 94960 ZIP code and, for most practical purposes, its identity. It is not, however, part of the Town of San Anselmo. It's an unincorporated Marin County community, which means county planning and building departments govern permits and inspections there, not San Anselmo's Town Hall. The valley along Butterfield Road has its own character to match, larger lots, mostly mid-century ranch homes, a community association built around a clubhouse and pool, and Hidden Valley Elementary feeding toward San Domenico School at the valley's far end.

The distinction is easy to miss because the mailing address looks identical to a Town parcel three blocks away. It stops being easy to miss the moment you file a permit application with the wrong agency or assume a resale inspection requirement applies when it doesn't. Confirm which jurisdiction actually governs a 94960 parcel before you build a timeline around it.

What Pre-War Wiring Adds to the List

San Anselmo's housing stock leans old. Craftsman, Tudor, and Spanish Revival homes fill the flats and lower slopes across downtown, Yolanda, Winship Park, and Brookside, while mid-century ranches take over in Sleepy Hollow and the upper hillsides, with the Bald Hill slopes adding newer custom builds and view remodels. A house built before 1940 in this town is common enough to be the rule rather than the exception, and knob-and-tube wiring shows up regularly in the inspection reports that follow.

A local electrician working across San Anselmo and Fairfax quotes typical knob-and-tube replacement in the $6,000 to $30,000 range, with the spread driven by access, existing conditions, and how much permit and PG&E coordination the scope requires. Standard jobs run one to three weeks. Larger projects needing permits and utility coordination can stretch four to twelve weeks, which is worth knowing if you're trying to close a rewire before a move-in date.

The more consequential issue is insurance, not cost. Carriers have been tightening standards around active knob-and-tube in recent years, and a lender will not fund a loan without a homeowners policy in place. If a home inspection turns up active K&T, that finding can affect financing well before it affects the electric bill.

The Order That Actually Matters

Line these three items up and a pattern shows itself. The sewer lateral is negotiable and travels with the property for up to 90 days after close, so it rarely blocks a sale outright, it just needs to be priced and assigned in the contract. The flood disclosure is mandatory and non-negotiable, but it's a disclosure of risk, not proof of coverage, so the real work is getting an insurance quote before you're locked in. Knob-and-tube wiring is the one item with the power to stop a closing cold, because an insurer's refusal to write a policy can take financing off the table entirely.

Knowing which of the three can actually delay you, and which one just needs to be written into the offer correctly, is the difference between a San Anselmo transaction that closes on schedule and one that stalls in week six over something that should have been flagged in week one.

A Few Direct Questions

Do I have to fix the sewer lateral before I can sell my San Anselmo home? No. RVSD requires a Certificate of Compliance at sale, but the responsible party has 90 days after close of escrow to get it, and a purchase contract can assign that responsibility to either side.

Does every pre-1940 San Anselmo home have knob-and-tube wiring? Not every one, but it's common enough on this housing stock that a home inspection should specifically call out whether any remains active, since that finding can affect insurability and financing.

Is Sleepy Hollow part of the Town of San Anselmo? It shares the 94960 ZIP code but is unincorporated Marin County, governed by county planning and building departments rather than San Anselmo Town Hall.

If you're weighing a purchase or a sale on San Anselmo's older housing stock, the paperwork trail is worth mapping before you write or accept an offer, not after. Tam Home Team works this market closely enough to know which items are contract language and which ones are dealbreakers. Get your instant home valuation or schedule a consultation to talk through what your specific parcel actually requires.