Milpitas sewer line repair: a homeowner's guide

Sewer line repair in Milpitas: what's under the older houses

Milpitas incorporated in 1954, and the Ford assembly plant that opened the following year pulled housing in behind it. Residential building picked up through the 1960s and 1970s on what had been hayfields and orchards, while the Midtown area along the old main road is the oldest part of town. Newer townhomes and condominiums have filled in since, especially toward the west side of town.

The age of a house is the best first guess at its pipe. A Milpitas home from the late 1950s or 1960s usually has a vitrified clay lateral in short lengths with mortar or compression joints, and often cast iron under the house. Some homes from that era were built with Orangeburg, the tar-and-wood-fiber pipe that was used into the early 1970s and softens and flattens with age. Houses from the late 1970s on are more likely to have ABS or PVC, which doesn't rust or let roots in through sound joints but can still separate, sag or be crushed. The camera is the only way to know what yours has.

Fifty to sixty-five years is about when clay joints and cast iron start causing trouble, which puts much of the older housing stock in Milpitas right in that window.

Ground, water and trees

Milpitas sits on two kinds of ground. The eastern side climbs into the foothills of the Diablo Range, and the creeks that drain them, including Calera, Penitencia and Arroyo de los Coches, run west across town toward the Bay. The western side is low, flat land close to sea level, on deep alluvial soil that was farmed for decades before the houses went in.

That matters for sewer lines in a few ways:

• Flat ground means gentle slopes. On level lots, laterals are often laid with very little fall. A small sag where the soil settled under a joint becomes a belly that holds water and collects paper.
• Wet winters, dry summers. Milpitas gets about 15 inches of rain a year, nearly all of it in winter. Soil that's soaked in January and dry by September shrinks and swells around the pipe. That's enough over decades to pull clay joints out of line.
• Trees grew up with the tracts. Street trees and backyard trees planted in the 1960s are now large, and a single leaking joint is often the wettest place in a dry summer yard. Roots find it.
• Foothill lots. Homes on the eastern hillside streets can have deeper or steeper laterals, which affects how a repair is dug and what it costs.

Who handles which part of the line in Milpitas

Milpitas does not split the line the way San Jose does, so don't assume the San Jose rule applies.

The City of Milpitas sewer page describes three pieces. The city's wastewater staff maintain the public sewer mains. The house sewer, from the building out to the property line, is the property owner's responsibility. The house lateral, from the property line to the main, is treated differently: the page says the user is responsible for clearing stoppages in it, and that the city makes repairs where a broken pipe or structural failure is the cause. It also says a street cleanout at the property line is the city's access point, and that the user is responsible for installing one where none exists.

The details matter for who pays, so before you approve any work near the sidewalk or street, check with the City of Milpitas for your address. Ask specifically whether a problem the camera found is on the house sewer or the house lateral, and whether a property-line cleanout is required. If sewage is spilling or backing up, the city asks residents to report it right away to Public Works, or after hours through the city's police dispatch.

What usually goes wrong

• Roots at clay joints. The most common finding on 1950s–60s laterals. Usually more than one joint.
• Offset joints. Sections shifted by settling soil, leaving a lip that catches paper and lets roots in.
• Bellies. Low spots in a flat run, where water stands and solids settle.
• Cast iron scale and channel rot. The floor of old cast iron under the house rusts thin and rough, then opens up.
• Orangeburg deformation. Where it's present, the pipe goes oval and can collapse.
• No cleanout. Many older houses don't have one, so every visit starts by pulling a toilet or going through a roof vent.

Signs you need more than a clearing

One clog is a clog. These suggest a damaged pipe:

• The main line needs clearing more than once a year
• Clay pieces, rust flakes or soil come back on the cable
• A damp, sunken or unusually green strip of yard along the sewer path
• Sewer smell outside the house, near the line's route
• All drains slow at once, with the lowest tub or shower backing up first

Signs of a broken sewer line covers each of these in more detail.

Repair options for Milpitas homes

• Spot repair: one broken section dug out and replaced, when the rest of the pipe is sound. Typically $1,500–$4,000 in the yard, more near the street or under a driveway.
• Trenchless lining or pipe bursting: a new pipe through small pits. A full lateral runs $15,000–$30,000, and it is often worth it when the line passes under a driveway, patio or mature tree.
• Open-trench replacement: practical on flat lots where the line runs under lawn or soil. Yard-only replacement is usually $6,000–$15,000.
• Camera inspection: $250–$500, recorded. The basis for every honest quote.
• Hydro jetting and drain cleaning: roots and scale cleared so the camera can see the wall, or as upkeep on a line that isn't ready to replace.

Full price tables are on the cost page.

How a repair usually goes, step by step

1. Access. Find or add a cleanout. Adding a two-way cleanout at the house is usually $600–$1,500, and in Milpitas ask whether a property-line cleanout is also needed.
2. Clear the line. Cable or jet so the camera can travel the full run.
3. Camera to the main. Recorded, with the footage counter on screen. Ask to watch.
4. Locate and mark. Each problem painted on the ground with its depth, and noted as house-side or street-side of the property line.
5. Confirm responsibility. If anything is past the property line, check with the City of Milpitas before work is priced.
6. Written quote. Method, footage, depth, permit, and what will be restored.
7. Permit and inspection. Lateral work normally needs a permit and an inspection before backfill; check with the City of Milpitas building department for what applies, and make sure the contractor pulls it.
8. After video. A camera run on the finished line. Keep it with the house records.

Comparing estimates

When two quotes for the same line are thousands of dollars apart, the difference is almost always in what they include. Line them up on:

• Method. Spot repair, lining, bursting or trench, and why that one.
• Footage and depth. How many feet, and how deep at each end.
• Property-line work. Whether any part is on the public side, and whether the city has been asked.
• Cleanouts. Whether a new cleanout is included, and where.
• Permit. Listed on the quote, in the contractor's name.
• Restoration. Concrete, pavers, lawn and landscaping, and who puts them back.
• Branch reinstatement. After lining, how many connections get reopened, and at what price each.

Check any contractor's license with the California Contractors State License Board (CSLB) before you sign.

Questions to ask a contractor in Milpitas

• What is my pipe made of, and does it change partway along?
• Is the problem on my side of the property line or the city's?
• Is there a street cleanout, and if not, will I need one?
• If you line the pipe, where does the liner stop?
• What happens to the trees near the line?
• Will I get the before and after footage?

Buying an older house in Milpitas

On a house from the 1950s through the 1970s, a camera inspection during the contingency period is cheap protection. It shows the pipe material, the roots and any breaks, and it gives you a recording to price repairs against. If the seller has recent footage, ask for it, and check the date and the address on the file.

Nearby

Berryessa and North San Jose to the south share much of the same era of housing; the San Jose sewer guide covers them, with the City of San Jose's different lateral rules. Who owns the sewer lateral in San Jose explains the San Jose side of the line. Fremont lies to the north.