Sewer Replacement, Done Right the First Time.
Trenchless and traditional sewer line replacement across the North Bay. Modern materials, permitted work, and the kind of job that lasts the life of the home — not until the next root grows back.
See What Replacement Looks Like.
Two real WCP sewer replacement projects across Sonoma and Marin. Drag the slider on each one to compare the failed line we replaced with the modern PVC line we installed.
Cast Iron to PVC Replacement
50-year-old cast iron sewer line, completely corroded with root intrusion at three joints. Replaced with modern PVC under crawl space access.
Under-Slab Sewer Replacement
Collapsed sewer line under finished concrete slab. Required slab cut, line replacement, and full concrete restoration. Coordinated tile work with homeowner’s contractor.
← Drag any slider to compare →
What North Bay Homeowners Are Saying.
Real reviews from real customers across Sonoma, Marin, and Napa — pulled directly from our Google Business Profile.
When Repair Stops Working, It’s Time to Replace.
Sewer line failure rarely happens overnight. The signs build over months or years — and getting ahead of them saves thousands in property damage and emergency cleanup.
Multiple Drains Backing Up
If toilets, tubs, and sinks all back up at once — or one drain backs up when another is in use — the problem isn’t a single fixture. It’s your main sewer line. Snaking won’t fix a collapsed pipe.
Tree Roots in the Camera Footage
If a sewer camera shows roots inside the line, repeated snaking won’t solve it — the roots will grow back through the same crack within months. Replacement seals the line so roots can’t penetrate.
Wet Spots or Sinkholes in the Yard
A leaking buried sewer line saturates the soil above it. Wet patches, unusually green grass over the pipe path, soft spots, or actual sinkholes all signal the line has cracked or collapsed underground.
Old Cast Iron, Clay, or Orangeburg Pipe
If your home was built before 1980, your sewer line is likely cast iron, clay, or Orangeburg (compressed paper-fiber pipe). All have 50–75 year lifespans — many North Bay homes are well past it. Modern PVC lasts 80+ years.
Sewage Smell Inside or Outside
A working sewer line is sealed and odorless. If you smell sewage in your basement, crawl space, or yard, the line is leaking somewhere. Beyond unpleasant, untreated sewage exposure is a real health hazard.
Snaking Every Few Months
Calling a plumber to clear the same line two or three times a year is a sign the pipe itself has failed. You’re paying for repeat service that doesn’t solve the problem — replacing the line once costs less than five years of repeat snaking.
Trenchless or Traditional. Both Done Right.
Sewer line replacement comes in two flavors. The right method depends on your line’s condition, the location, and what’s above it. We’ll camera the line, walk you through both options, and recommend the one that fits your situation.
Trenchless Replacement
Replace the buried sewer line without digging up the yard. Two small access pits and either a new pipe pulled through the old one (pipe bursting) or a resin liner cured inside the existing pipe (CIPP).
- Yard, driveway, and landscaping preserved
- Often less expensive once restoration is factored in
- Faster — usually 1–2 days vs. 2–5 days excavating
- Modern HDPE or epoxy-cured pipe rated 50+ years
Traditional Excavation
Dig a trench the full length of the sewer line, remove the failed pipe, install new modern PVC, backfill, and restore the surface. Required when the line is collapsed beyond lining or a complete realignment is needed.
- Works for fully collapsed or severely misaligned lines
- Allows for line slope and route corrections
- Modern PVC pipe rated 80–100 years
- Yard restoration coordinated with the project
Replace 50 Feet of Sewer. Save the Driveway.
Two ways to replace the sewer line beneath your home. One leaves a 50-foot trench across your front yard. The other doesn’t. Same modern pipe. Same lifetime fix. Without the destruction.
- Full trench across yard
- Driveway often cut
- 2–5 days of work
- Major restoration cost
- Two small access pits
- Driveway preserved
- 1–2 days of work
- Minimal restoration
Most trenchless jobs finish in a single day. Versus 2–5 days for traditional excavation.
No driveway concrete to repour. No lawn to regrade. No sprinklers to rebuild. The yard stays exactly how you left it.
Modern HDPE pipe and CIPP liners are rated 50+ years — same long-term durability as excavation.
Trenchless doesn’t fit every job. Camera inspection tells us if it fits yours.
Find Out If Trenchless WorksThe Replacement Quote, Without the Surprises.
Every WCP sewer replacement quote is detailed, written, and includes everything below. No vague phone estimates. No surprise “we found something extra” line items at the end.
Camera Inspection
Every quote starts with a camera inspection. You see the problem on a screen before we tell you what it costs to fix.
Permits & Inspections
We pull every permit. The work is inspected and signed off by the city or county. Your insurance and home value depend on this paper trail.
Modern Materials
PVC, HDPE, or cured-in-place lining — rated 50–100 years. We don’t install another generation of cast iron, clay, or Orangeburg.
Cleanup & Restoration
Yard backfill, sod or gravel restoration, driveway patching where needed. We leave the site looking better than when we started.
North Bay Sewers Have Three Big Enemies.
Three things make sewer line failures especially common in Sonoma, Marin, and Napa — and they’re working on your line whether you’re paying attention or not.
Mature Tree Roots
Oak, redwood, and bay laurel roots in older Petaluma, Santa Rosa, and San Rafael neighborhoods are aggressive. Old clay and cast iron joints can’t keep them out — once roots invade, replacement is the only permanent fix.
Aging Pipe Materials
Many North Bay homes built before 1980 still have original cast iron, clay, or Orangeburg sewer lines. After 50+ years of use, the pipe walls have corroded, shifted, or compressed — failure is inevitable, just a matter of when.
Ground Shift & Settlement
The North Bay sits on active fault lines and expansive clay soils. Earthquakes, seasonal soil movement, and natural settlement crack pipe joints, create sags (“bellies”) that hold waste, and break old lines — often in ways insurance won’t cover.
Whatever Failed, We Replace It Right.
From the main line to the cleanouts to the laterals connecting your home, we handle every part of a sewer system replacement — permitted, inspected, and built to outlast the house above it.
Main Sewer Line Replacement
Full replacement of the buried line carrying waste from your home to the city sewer. Modern PVC or HDPE pipe rated for 80–100 years — the kind of job you do once.
Trenchless Sewer Replacement
Replace the buried line through two small access pits — no trenching across the yard. Pipe bursting and CIPP lining options available depending on the line’s condition.
Lateral Connection Replacement
The branch lines connecting your house to the main sewer can fail independently. We replace damaged laterals from cleanout to foundation — often without disrupting the main line.
Cleanout Installation & Replacement
Code-compliant cleanouts let future maintenance happen without digging. We add cleanouts to systems that don’t have them, and replace damaged ones during full sewer replacements.
Under-Slab Sewer Replacement
For homes with sewer lines beneath concrete slabs, replacement requires careful excavation, slab cutting, and re-pour. We coordinate the entire project, including concrete and tile work.
Sewer Camera Inspections
Pre-purchase inspections, diagnostic camera runs, and post-replacement verification. We document everything on video so you see exactly what’s in your line — and what we did about it.
Real Sewer Jobs From Across The North Bay.
A snapshot of recent sewer replacement projects across Sonoma, Marin, and Napa — from full main-line trenchless installs to under-slab excavations.
Main Line Replacement — Santa Rosa
Cast Iron Replacement
Camera Diagnosis
Slab Cut Replacement
Lateral Connection
Trenchless & Cleanout Install — Napa
Photos from real WCP customer projects. Names and exact addresses withheld for privacy.
Sewer Replacement The Permanent Way.
Sewer replacement is one of the biggest plumbing investments a homeowner makes. Done right, it lasts the life of the house. Done wrong, you’re paying twice. Here’s how we make sure it’s the first one.
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Camera-First Diagnosis
We don’t recommend a $10,000 replacement based on guesswork. Every job starts with a camera inspection — you see exactly what’s wrong before we quote a fix.
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Trenchless When It’s Better
Most contractors only know how to dig. We offer trenchless because sometimes that’s the right call — preserving your yard, driveway, or landscaping while still solving the problem permanently.
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Permitted & Inspected. Always.
Main-line and under-slab work is permitted and signed off by the city or county inspector. The paper trail protects your insurance, your warranty, and the next person who buys your home.
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Lifetime Materials. Real Warranty.
PVC, HDPE, and CIPP lining rated 50–100 years. Full written warranty on workmanship. We don’t cut corners, and we don’t hide behind fine print when something needs fixing.
A Major Project, Without the Major Hit.
Sewer replacement is one of the bigger plumbing projects a homeowner faces. We’ve partnered with trusted home-improvement lenders so the cost doesn’t have to come out of one paycheck — or one savings account.
0% Promotional APR
Qualified applicants can get 0% APR for 12, 18, or 24 months — meaning a $10,000 sewer replacement costs the same whether you pay cash or finance it.
Approval in Minutes
Apply on a phone or laptop, get a decision in under 5 minutes. No sales pressure, no impact on your credit score for the initial check.
No Prepayment Penalty
Pay it off in three months, three years, or anywhere in between — no fees for early payment, ever. The plan flexes to your situation.
From Surprise Repair To Manageable Payment.
A $7,500 sewer replacement that needs to happen this week becomes a manageable monthly cost — one that often fits inside the same household budget without disruption.
- Soft credit check
- Apply in 2 minutes
- 12–120 month terms
- $1k–$100k available
Financing through partnered lenders. Subject to credit approval. APR and terms vary by applicant. WCP doesn’t profit from financing — we offer it because customers asked for it.
Honest Answers About Sewer Replacement.
How much does sewer line replacement cost?
Cost varies by scope, length, depth, soil conditions, and method. Trenchless sewer replacement: typically $4,000–$12,000 for an average residential line. Traditional excavated replacement: typically $6,000–$20,000+ depending on length and access. Lateral connection replacement: usually $3,000–$8,000. Under-slab work adds $2,000–$6,000 for slab cutting and concrete restoration. We give detailed written quotes after a camera inspection — never vague phone estimates.
How do I know if I need replacement or just cleaning?
The clearest answer comes from a camera inspection. Cleaning works when the pipe is structurally sound — just dirty, partially blocked, or has roots that can be cut out. Replacement is the right call when the camera shows cracks, collapsed sections, root intrusion through joints, sagging (“bellies”), or pipe material that’s reached the end of its life. If you’ve had two cleanings in the last year for the same line, the answer is almost always replacement.
Trenchless or traditional — which is right for my house?
Trenchless works for most lines that are still structurally connected, even if cracked or root-invaded. Traditional excavation is required when: the line is fully collapsed, the pipe slope needs to be corrected, the route needs to change, or there are major sags that lining can’t fix. We camera the line first, then walk you through both options if both apply — with honest pros, cons, and cost differences. We don’t push trenchless if it’s not the right fit just because it’s a higher margin.
How long does sewer replacement take?
Trenchless replacement: 1–2 days from start to backfill, with the home back to normal use the same day in most cases. Traditional excavation: 2–3 days for the line itself, plus another 1–2 days for full yard or driveway restoration. Under-slab work: 3–5 days when slab cutting and re-pour are involved. We give specific timelines before we start, including any city inspection scheduling.
Will my homeowner’s insurance cover sewer replacement?
Sometimes. Insurance typically covers sudden damage (a tree falling on the line, vehicle damage, certain types of collapse) but not gradual wear like aging pipes, root intrusion over time, or general deterioration. Some policies have specific service-line endorsements that cover sewer line failure — check your policy or call your agent to confirm. We provide detailed documentation that helps when filing a claim. Always confirm coverage with your insurance company before assuming anything.
Do I need permits and inspections?
Yes — main sewer line replacement requires a permit and inspection in Sonoma, Marin, and Napa counties. Lateral and under-slab work also typically require permits. We pull every permit and handle all paperwork. Avoid contractors who offer to skip permits to save you money — unpermitted sewer work creates real problems when you sell the house, file an insurance claim, or have any future plumbing issue.
What kind of warranty do you offer?
Workmanship warranty on every sewer replacement, in writing. Manufacturer warranties on the pipe materials themselves — PVC and HDPE typically carry 50+ year material warranties from the manufacturer. We document the work with before/after camera footage so there’s no question about the scope or quality. If something we installed fails because of how we installed it, we come back and make it right — no debate, no fine print.
Why Homeowners Pick Us For Sewer Replacement.
Big-chain plumbing franchises spend more on advertising than they do on their technicians. Here’s how a real, family-owned local plumber compares for a major sewer replacement project.
| Feature | West Coast Plumbing | Big-Chain Franchises | Other Local Plumbers |
|---|---|---|---|
| Trenchless Capability | ~ | ~ | |
| Free Camera-First Diagnosis | ~ | ||
| Permits & Inspection Always Pulled | ~ | ||
| Upfront, Written Pricing | ~ | ||
| No Commission-Based Upselling | ~ | ||
| Family-Owned & Operated | ~ | ||
| Average Google Rating | 4.9 ★ | 3.6–4.2 ★ | 4.3–4.7 ★ |
| 0% APR Financing Available | |||
| Workmanship Warranty (Written) | ~ | ~ |
Done Patching the
Same Sewer Line?
Book a free in-home camera inspection. See exactly what’s wrong with your line, get a written quote covering both trenchless and traditional options — then decide.