Why septic matters so much here
Sonoma County alone has more than 36,000 parcels with septic systems, according to a 2024 county mapping study, and West Marin outside a few small village sewer districts relies on them almost entirely. Many systems were installed decades ago, under older standards, on soils that Permit Sonoma itself describes as notoriously poor for septic. Wet winters saturate the ground, and an older leach field that coped in a dry year can start backing up or surfacing in a wet one.
Septic problems also show up at the worst times: during a home sale, when you apply for a short-term rental license, or when a remodel or ADU permit triggers a county review of the system. Knowing what you have before those moments saves money and stress.
How it works
Tell us what you need with the form or a quick call. We pass the details to a licensed local septic contractor, who follows up to schedule a site visit, whether that is an inspection, a diagnosis of a failing system, or a review for a permit.
The contractor explains what they find and gives you a written scope. There is no obligation to proceed.
Septic work we help with
Inspections for home purchases, refinances, and Marin short-term rental licenses. Leach field diagnosis, repair, and replacement. Septic tank replacement, baffle and effluent filter repair, and risers that bring lids to grade. Mound systems, sand filters, pressure-dosed systems, pumps, and alarm panels. Septic reviews for ADUs, bedroom additions, and remodels.
Frequently asked questions
Does it cost anything to request an inspection or estimate?
No. Calling or sending a request is free and there is no obligation. We pass your details to a licensed local septic contractor, who will tell you up front what their inspection or site visit costs.
Which areas do you serve?
Rural and unincorporated Sonoma County, including the areas around Petaluma, Penngrove, Sebastopol, Forestville, Occidental, Santa Rosa, Glen Ellen, Kenwood, and Healdsburg, plus West Marin, including Point Reyes Station, Inverness, Marshall, Tomales, Nicasio, the San Geronimo Valley, Bolinas, and rural Novato.
Is a septic inspection required to sell a house in California?
There is no statewide rule requiring a septic inspection when a home is sold. In practice, most buyers, agents, and lenders want one during escrow, because a failed system can be one of the most expensive surprises a buyer inherits. Separate rules apply in specific situations, such as Marin County short-term rental licenses and building permits for ADUs or remodels.
Who is licensed to do septic work in California?
Septic installation and repair is done by contractors holding an appropriate California CSLB license, such as C-42 (sanitation system), C-36 (plumbing), or A (general engineering). Larger designs are often prepared by a civil engineer or other qualified professional. You can verify any license at cslb.ca.gov, and you should ask for proof of liability insurance before work starts.