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The hilly terrain around Mount Tamalpais puts constant stress on main sewer and water lines. Lateral lines running downslope can develop bellies or separations from soil movement. Drainage issues often channel water against foundation walls, which can lead to wet crawlspaces and accelerated corrosion of any pipes located there.

The winter rainy season here peaks with temperatures around 40°F. A pro-tip is to disconnect and drain garden hoses before the first forecasted frost, and insulate any exposed pipes in unheated crawlspaces. Ground saturation from rain can also shift foundation pipes, so checking for leaks after heavy storms is wise.

Water from the Marin Municipal Water District reservoirs is very soft, meaning it's low in dissolved minerals like calcium. While great for skin and appliances, soft water is slightly more corrosive to metal pipes over decades. It can accelerate the degradation of old galvanized steel and, without an anode rod check, lead to premature water heater tank failure.

Galvanized steel from the 1960s fails internally from scale buildup and rust. The joints, where threads have cut through the protective zinc coating, corrode first. You get calcification that blocks flow, followed by leaks as the threaded female fittings crack under pressure. It's a systemic issue, not a local repair.

The Corte Madera Planning and Building Department requires permits for any full repipe or major sewer work. As a licensed contractor with the CSLB, I handle that red tape, including scheduling inspections, so you don't have to. It ensures the work is documented and up to current code for your home's value and safety.

In a suburban setting like this, the lateral sewer line from your house to the street main is your responsibility. Tree roots seeking the water in old, jointed clay pipes are the most common cause of backups. A video inspection can show the condition of your lateral, especially if you have mature landscaping.

The galvanized steel plumbing installed in 1961 is now 65 years old. Homeowners on Christmas Tree Hill are seeing the final stage of corrosion, where pipes become paper-thin and develop sudden, widespread pinhole leaks. This material was only rated for 40-50 years, so entire systems are failing simultaneously. Replacing sections piecemeal often just shifts the stress to the next weak spot.

Heading past Mount Tamalpais on US-101, our dispatch route into Corte Madera takes about 20 minutes barring unusual traffic. We keep trucks staged for Marin County calls to hit that window. For urgent leaks, that travel time is often less than the time it takes for a homeowner to find their main shutoff valve.