Sewage is grossly contaminated (Category 3) water. A backup calls for professional cleanup and a plumber to fix the cause. Here's how that plays out in Petaluma, what to do right now, and how to reach an independent, licensed local provider. Call (628) 336-1777 any time, or use the form on this page.
Sewage backup cleanup in Petaluma: what we see
Older west-side Petaluma homes have older laterals under mature trees, and low areas near the river can see systems stressed in big storms. A backup into a lower floor is treated as grossly contaminated water.
The local picture
House age and sewer laterals. The age of the house is a good guide to the age of the lateral. Petaluma has older and historic homes on the west side near downtown and later subdivisions east of Highway 101.
Lot, slope and trees. Long laterals, steep runs and big trees all raise the odds of trouble. Petaluma spans the Petaluma River valley, with low ground near the river and rolling hills to the west.
Neighborhoods include the historic west side, downtown, and the east-side neighborhoods off North McDowell Boulevard. Conditions vary from street to street, so a provider should look at your specific home rather than assume.
What to do right now
- Keep everyone, especially children and pets, out of affected areas.
- Stop using water: no flushing, showers, dishwasher or laundry.
- Don't touch sewage without boots, gloves and eye protection.
- Photograph the damage for insurance.
- Call a plumber for the cause and a restoration provider for cleanup.
Want a local pro to take a look?It's free for homeowners and there's no obligation.
Petaluma checklist
- If your home is older, have the lateral camera-inspected.
- Find your sewer cleanout so a plumber can reach the lateral quickly.
- Keep grease and wipes out of drains.
- Check whether your policy has a sewer or water backup endorsement.
Local resources for Petaluma
- Permits: City of Petaluma
- Emergency alerts: SoCoAlert, the County's free notifications
- Sandbags: Sonoma County sandbag locations, updated during weather events
- Contractor licenses: CSLB license check
How a provider handles it
Cleanup involves containment, extraction, removal of porous materials the sewage touched, cleaning and disinfection of hard surfaces, and documented drying before any rebuild. For the full picture, read our complete guide and the deep dive After a flood: cleanup safety. We also have a storm-season article: How to use sandbags.
Before you hire anyone, check the license on the CSLB site. Here's how we vet providers.
Dealing with this right now?Tell us what's happening and we'll connect you with an independent local provider.
More for Petaluma
- Water damage in Petaluma: our full local page
- Sewage backup cleanup service
- Petaluma River flooding and flood cleanup in Petaluma: our in-depth local guide
- Burst pipe water damage in Petaluma
- Crawlspace flooding in Petaluma
- Storm and flood damage in Petaluma
- Appliance and water heater leaks in Petaluma
- Same problem nearby: sewage backups in Rohnert Park & Cotati, sewage backups in Sonoma, sewage backups in Sebastopol
- Sewage backup cleanup in every Sonoma County town
Sources
- SoCoAlert sign-up
- Sonoma County sandbag locations
- FEMA Flood Map Service Center
- CDC: flood safety
- CSLB license check
Sources checked October 18, 2026.
Frequently asked questions
Who's responsible for the sewer lateral in Petaluma?
Generally the homeowner owns the lateral from the house to the public main. Check with the City of Petaluma for your property.
Does homeowners insurance cover sewage backups?
Often only with a specific water backup endorsement. Check your policy.
Can I clean it myself?
Most sewage backups call for professional cleanup because of contamination. See categories of water.