Sewer Lateral Ordinances

LAST REVISION: [Thursday, February 24, 2022]

Several Municipalities and Sewer Districts in Marin County have enacted point-of-sale requirements with regard to private sewer laterals.  The following is a list of the current ordinances, phone numbers and website information (where available) for the various municipalities or districts and their respective ordinances: 

City of Belvedere
(415) 435-3838 

In the City of Belvedere, prior to the sale or exchange of any residential building or residential lot, the owner or agent must obtain from the city, a report of the residential building record from the City.  As part of the application for a residential building records report, the owner shall provide the City of Belvedere public works superintendent with a current videotaped report of the entire sanitary sewer lateral serving the building. The report shall include at least a written and graphic description of the sewer lateral as well as a compact disc containing photographs of any notable features of the sewer lateral. Based on the information contained in the report, the City of Belvedere may require repair or modification of the sewer lateral.


Las Gallinas Valley

Download the Las Gallinas Valley form here.


City of Sausalito
(415) 289-4192 

Section 18.12.100 of the Sausalito Municipal Code provides that, “Where remodeling or sale of any building is proposed, existing sewer service laterals shall be inspected for surface water connections or inlets, and shall be either pressure tested for leakage or inspected by video camera.  Service laterals found to be in a deteriorated condition shall be replaced, repaired or rehabilitated as necessary to eliminate infiltration and inflow of ground and surface waters.  Service laterals shall be re-tested for leakage or re-inspected by video camera upon completion of any remedial work, and shall be approved by the City Engineer prior to transfer of title or approval of the building permit.

If the property offered for sale is located in Sausalito, then both Seller and Buyer are advised to contact the City of Sausalito to determine the application of this ordinance to a proposed sale of that property.

Click here ( for more information


Ross Valley Sanitary District - (Neighborhoods and Municipalities: Bon Air, Town of Fairfax, Greenbrae, Kentfield, Kent Woodlands, City of Larkspur, Oak Manor, Town of Ross, Town of San Anselmo, and Sleepy Hollow)
(415) 259-2949

Ordinance 66 of the Ross Valley Sanitary District code requires testing (and possible repair and replacement) of virtually all private sewer laterals at either a) the time of sale of the property; or b) remodel projects in excess of $75,000 or remodel projects which add a bathroom. 

Click here ( for more information

Video of RVSD Sewer Lateral Ordinance Discussion with MAR


Sanitary District 5 of Marin - this district services Belvedere and parts of Tiburon east of Gilmartin Drive. Inspection videos conducted by a Licensed Contractor must be submitted to the District Engineer prior to the transfer of title. The District will then determine if the lateral requires repairs or a full replacement and issue a Notice of Repair. Items listed in the Notice of Repair will be given a 6-month timeframe for completion.  The intent of the District is to allow the repairs to be negotiated between buyer and seller without getting involved in the escrow process. In other words, repairs may be completed outside the escrow process. 

For more information please contact Sanitary District 5 of Marin at (415) 435-1501 or 


Sewerage Agency of Southern Marin (Areas include: City of Mill Valley, parts of the City of Larkspur in the Richardson Bay Sanitary District, and incorporated Marin County in the Almonte Sanitary District, Alto Sanitary District, Homestead Valley Sanitary District, Tamalpais Community Service District (portion of Kay Park)).

City of Mill Valley:                                            (415) 388-2402 
Almonte Sanitary District:                              (415) 388-8775
Alto Sanitary District:                                      (415) 388-3696
Homestead Valley Sanitary District              (415) 388-4796
Richardson Bay Sanitary District:                 (415) 388-1345
Tamalpais Community Service District:       (415) 388-6393


The Sewerage Agency of Southern Marin (SASM), enacted a Model Ordinance, which was adopted by all of the member agencies enumerated above, establishing a sewer lateral program whereby the private sewer laterals of homes listed for sale must be inspected with a CCTV camera by certified contractor.  The video inspection report must be submitted to the respective district engineers, or their designee, for a determination of repair or replacement of the sewer lateral.

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