Replacing a Sewer Pipe

Corrosion in steel and cast iron sewer pipes is a significant problem, leading to leaks, reduced water pressure and potential structural damage. Over time, continuous exposure to water and oxygen can degrade these pipes, resulting in costly repairs and health hazards due to mold and mildew growth. In this case, our client recognized the severity of the problem and sought our expertise to replace the at-risk plumbing pipes serving two bathrooms, the kitchen, and the laundry area.

Client’s Problem

The corrosion of steel and cast iron pipes is a very serious problem. Corrosion can cause leaks or even cracking, so it’s important to keep an eye on your galvanized metal pipes for any signs that they’re being eaten away by calcium build-up from regular wear and tear. Client had corroded leaking sewer lines. We had to replace sewer pipes for two bathrooms, kitchen and laundry.

Case Overview: Complete Residential Sewer Pipe Replacement in San Diego

Underground main sewer lines are responsible for carrying all wastewater away from your home’s bathrooms, kitchen, and laundry facilities to the municipal sewer system. In this San Diego residence, an aging mainline began experiencing repeated backups, slow drainage across multiple fixtures, and foul sewage odors near the property line. Video camera inspection revealed severe structural cracking, heavy root intrusion, and widespread bottom rot along the original line. To protect the home from dangerous wastewater backups and structural dampness, Almco Plumbing executed a full excavation and sewer pipe replacement project.

Understanding the Service: Signs & Causes of Failing Sewer Lines

Sewer lines are invisible until they start to have severe problems deep underground. Over decades of continuous use, underground main lines—especially older cast iron, clay, or galvanized pipes—gradually succumb to environmental wear. Most often, they rust, wear out, and crack, resulting in holes and structural collapses in the pipes.

When underground sewer lines break down, the escaping wastewater causes extensive collateral damage throughout the property. Leaks in sewer pipes lead to structural dampness beneath subflooring, toxic mold appears on walls and around baseboards, and an unpleasant sewage smell begins to be felt inside and outside the house. To solve this problem permanently when non-invasive lining isn’t structurally feasible, you need to excavate, get directly to the pipes, and replace their damaged parts with modern, code-compliant materials.

Primary Drivers of Sewer Pipe Failure in San Diego:

• Internal & External Corrosion: Constant exposure to sewer gas, household chemicals, and mineral-rich soil breaks down metal pipe walls over time.
• Aggressive Tree Root Intrusion: Hungry roots seek out microscopic hairline cracks in sewer joints, expanding inside the pipe until flow is completely blocked.
• Soil Settlement & Pipe Sagging: Shifting ground conditions cause sections of pipe to sink, creating low spots (“belly”) where solids accumulate and cause constant clogs.
• Aging Pipe Materials: Older homes built with original cast iron or bituminized fiber (Orangeburg) pipes have reached the end of their functional lifespan.

The Almco Solution: Step-by-Step Excavation & Sewer Pipe Replacement

Replacing a main sewer line servicing a multi-fixture home requires precise engineering, local municipal permitting, and meticulous site safety. Our certified plumbing team coordinated the entire project from initial mark-outs through final safety inspection, ensuring zero disruption to surrounding utility lines.

We executed the replacement following a rigorous 8-step process:

1. Locate the Sewer Line: One of the most critical steps in digging a trench for sewer line replacement is making sure we are digging in the exact right location. We use advanced electronic line locators and camera transmitters to map the depth, direction, and precise path of the damaged pipe.
2. Locate the Utility Lines: Before breaking ground, technicians will mark your yard for electrical, water, gas, cable, and other vital municipal services (811 call out). Do not forget that there may also be homeowner-installed services such as sprinkler lines, high-voltage lighting, and landscape drains in your yard that require careful hand-digging.
3. Apply for Permits: Sewer main replacement requires proper municipal plumbing permits in San Diego. A city inspector will visit the worksite to make sure the work has been done in full compliance with local building codes. In the case of a sewer line replacement, this inspection is normally conducted after the new sewer line has been installed but before the trench has been backfilled.
4. Break or Remove Obstructions: Before we can reach the soil layer, our crew may have to break through and remove hardscape obstructions such as concrete or brick sidewalks, driveways, retaining walls, or patio slabs.
5. Dig the Sewer Trench: Using specialized mini-excavators and hand trenching techniques, we carefully dig a stable, sloped trench alongside the old sewer main, exposing the entire length of pipe slated for replacement.
6. Cut Tree Roots & Clear Bedding: We cut away invasive root systems surrounding the trench and prepare a smooth, compacted gravel base to ensure proper pitch and prevent future pipe sagging.
7. Assess & Replace the Sewer Line: We remove the fractured pipe sections and install high-grade, schedule-40 PVC sewer piping. All joints are solvent-welded, and cleanouts are installed for easy future maintenance.
8. Complete & Inspect the Project: After the sewer pipe replacement is complete, we make sure to have the work inspected by municipal officials before filling in the trench with crushed gravel bedding and backfill soil, compacting the ground to prevent future settling.

Project Conclusion & Long-Term Results

As a result of our work, the client now has brand-new, high-efficiency sewer pipes installed servicing two full bathrooms, the kitchen, and the laundry area. These heavy-duty PVC sewer pipes are covered by an industry-leading 50-year warranty, guaranteeing structural integrity and root resistance for decades to come. Now the client will no longer be bothered by sewer leaks, continuous backups, and their costly property consequences.

If you are experiencing recurring problems with your residential or commercial plumbing system, Almco Plumbing is a trusted, professional solution for your home. Book our services online today or call our team directly to schedule a camera inspection and repair or replace your main sewer lines.

Review by Bob Lee

They made a challenge to install a new sewer system in the house, very satisfied with the quality of the work done. I recommend this company to everyone, because they fulfill everything on time and the result I am satisfied with.

I advise everyone who can not find a good company to install a complex sewage system.