Hillsborough Sewer Lateral Inspections Before a Sale Closes

Every Hillsborough house connects to the Town through two buried pipes. One is the sewer lateral, which runs from the house down to the main in the street. The other is the water line, which runs out to the Town's meter. Under Hillsborough Ordinance No. 702, the homeowner is responsible for keeping both in repair. On most transfers of an improved parcel, both have to be tested and video-inspected, and any repair the Town requires has to be finished before title transfers.

That makes the sewer a closing condition. In most places it is just one more item on an inspection report. In Hillsborough it is enforced by the Town, and the reasons are the same ones that put a $4,386.89 sewer charge on every home's FY 2026–27 property tax bill. Once you see why the charge is that high, the strictness of the title-transfer rule makes sense. So does the right time to deal with it.

The rule sits in the municipal code

The requirement comes from Hillsborough Municipal Code §13.32.110. The Town rewrote that section in Ordinance No. 702, adopted June 11, 2012. When an improved parcel transfers, the private sewer lateral and the water line must be tested for infiltration and leaks and video-inspected. The sewer lateral must also be checked for a working backflow prevention device, and one must be installed if it is needed. The Town has to approve the testing and any repairs. The required work has to be done before the transfer, although the owner and the buyer can split the cost however they agree.

Two things set this apart from a typical sewer scope. First, the water line is included. A seller can't plan around the sewer lateral alone. Second, a repair can't be handled with a closing credit and finished after escrow. In the published code text, if a sale closes without compliance, the new owners become responsible for the testing and repairs, and the Town can treat a failure to complete them as a public nuisance. Ordinance 702 adds that a leaking private lateral can be declared a public health nuisance subject to abatement.

The WEF-PPVL library's copy of the ordinance spells out what counts as a transfer. Foreclosures and transfers of undivided interests trigger the requirement. A transfer into the seller's own living trust does not. That older text also let the city engineer waive the requirements for a parcel tested, certified and inspected within the two years before the transfer. Ordinance 702 sets up the Compliance Certificate described below for sewer laterals. We could not check any of these provisions against the live codified version, so confirm them with the Town for any specific estate, trust or recently tested property.

Why the Town holds the line

The Town's 2026 sewer rate study explains the economics. Hillsborough serves about 3,900 residential customers and 7 commercial customers. More than 99% of its accounts are single-family homes, and every home is billed as one Equivalent Dwelling Unit, a single flat charge per house. With almost no commercial users to share the cost, nearly every dollar of the system comes from homeowners.

The Town also has no treatment plant of its own. Its wastewater is treated in San Mateo and Burlingame, and the Town reimburses each city for its share of the flow. The study projects FY 2026–27 treatment costs of about $2.9 million and assumes they will rise 5% a year.

This is where the private lateral enters the Town's budget. When groundwater or stormwater gets into a cracked lateral, it travels to those plants as sewage, and Hillsborough pays to treat it. The rate study describes its capital program as preventing excess stormwater from entering the sewer system "which leads to unnecessary treatment costs of rainwater." That program includes help with private lateral repairs. It is funded at $5.1 million a year on a pay-as-you-go basis. A leaking lateral on one property raises the treatment bill for every household.

The program also has a regulatory history. The San Francisco Bay Regional Water Quality Control Board received a 60-day notice from Baykeeper on June 6, 2008. On September 16, 2008, it issued a tentative cease-and-desist order and an administrative civil liability complaint against the Town. Under the Board's settlement terms, the penalty was $405,000. Of that, $225,000 was satisfied through a Supplemental Environmental Project for private lateral inspection and rehabilitation. The Town's own inspection form refers to the resulting order as Cease and Desist Order R2-2009-0020. So the private lateral has been part of Hillsborough's compliance obligations from the beginning.

Where the $4,386.89 goes

The debt from that period still shows up in the rate. The study lists three annual debt payments for the sewer enterprise.

The San Mateo payment covers Hillsborough's share of upgrades to the wastewater treatment plant that the City of San Mateo owns and operates. The study ties that plant to compliance with the Regional Board's cease-and-desist order. The State Revolving Fund loan had $7.9 million in principal outstanding as of June 30, 2025.

Spread across about 3,900 homes, those costs produce the FY 2026–27 charge of $4,386.89. That is up $75.89 from $4,311. The adopted five-year series allows increases of up to 3% a year, reaching $4,937.48 in FY 2030–31. The study calls those proposed figures "the maximum amount that rates can be set" and recommends that the Town monitor its fund balance before each later increase. The Council adopted the series at a public hearing on May 11, 2026. The City Clerk reported one valid written protest. A majority protest would have required 1,953.

For a buyer comparing carrying costs, the charge is billed on the property tax roll. It appears on the tax bill and on no listing sheet. Because it is a flat charge per home, a modest house and a large estate pay the same amount.

What the transfer process costs at the permit counter

The Town's adopted FY 2026–27 fee schedule, effective July 1, 2026, sets these charges for a sale:

• Transfer of Title Sewer & Water Line Testing Permit: $545, down from $716 in FY 2025–26
• Sewer Video Review: $747
• Transfer of Title, Water Line Testing Only: $382
• Sewer lateral alterations added to a transfer permit, including a cleanout or backwater device: $306 plus the base permit fee
• Water line pressure-reducing valve or backflow preventer: $35 plus the base permit fee

These are Town fees only. Contractor labor, excavation and any replacement pipe are extra. We found no current Hillsborough cost figures for that work, and estimates from more than a decade ago would mislead more than they would help.

The Town's testing handout says only the homeowner or a California-licensed plumbing contractor may obtain the permits. The water service is tested at full street pressure and must show no loss of pressure. The sewer lateral gets a water or low-pressure air test. A clear, dated CCTV video with a footage counter then goes to Engineering for review and approval. The Town keeps a list of plumbing contractors it knows to be qualified for this work and is careful to say the list is not an endorsement.

The certificate that can take the sewer test off the critical path

Ordinance 702 created a Compliance Certificate for private sewer laterals. While a certificate is in force, the lateral is exempt from the testing and inspection requirements unless it has been physically altered. A new or fully replaced lateral earns a 20-year certificate. A repaired lateral, or an existing lateral that passes an approved pressure test, earns a 10-year certificate. The owner is responsible for renewing it before it expires. The certificate applies to the sewer lateral. We found no matching certificate term for the water line test.

This turns a closing-week scramble into a task the seller can finish ahead of time. A homeowner doesn't have to wait for a sale to get a certificate. They can document compliance or arrange a pressure test observed by a Town inspector. The ordinance also links private work to the Town's own main repairs. When the Town rehabilitates a lower lateral, it waives permit fees for upper-lateral work done by its contractor, or by another contractor within 90 days after the Town's work is finished.

For a seller, the practical sequence looks like this:

1. Ask Public Works whether the property already has a current Compliance Certificate, and when it expires.
2. If it doesn't, schedule the sewer and water line tests before listing, so a failed test turns into a repair plan and not a delayed closing.
3. If repairs are needed, finish them and get Town approval before marketing the home, or agree in writing with the buyer on how to split the cost before escrow opens.
4. Include the certificate or the approved test results in the disclosure package so the buyer's side doesn't have to start the same process over.

Short answers to the questions that come up in escrow

Does a buyer have to accept a seller's repair credit in place of the work? The code requires the work to be completed before transfer. Only the cost can be divided between the parties.

Is there financial help? Ordinance 702 allows the Town to offer hardship loans, with amounts and terms set by the Council. An older Town form mentioned a $500 reimbursement under a 2009 program. We could not confirm that either is available today. Public Works is the place to ask.

Is the code text quoted here the final word? It comes from the Town's published ordinance. Check the currently codified version with the Town before relying on it for a specific transaction.

Before a Hillsborough listing goes live, Warren Real Estate LLC can coordinate the lateral and water line testing, the certificate check and any pre-sale repairs, so the underground work is finished well ahead of escrow. Request a confidential consultation to plan the timeline for your property.

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