Simi Valley is a basin ringed by hills, and both the valley floor and the slopes around it contribute to the sewer work here. The valley soils are clay-rich with a genuine shrink and swell capacity, and the local climate works them hard. This is an inland valley, screened from the coastal marine layer, so summers are hot and entirely rainless for five or six months, drying and contracting the clay away from the pipe. Then the winter storms arrive and saturate it within days. A rigid lateral with a bell joint every few feet absorbs that annual swing at the joints.
Most of the city was built from the 1960s through the 1980s, which places the laterals in the later vitrified clay and early plastic era. On clay pipe the seasonal movement opens bells and roots follow. On plastic, which flexes and has far fewer joints, the movement concentrates stress at the fixed points instead, where the lateral passes through the building foundation and where it ties into the main in the street. Those are the first two places we look on a newer line in clay ground.
The surrounding hills bring two further factors. Creating level building pads against the valley margins required cutting and filling, and engineered fill continues consolidating for decades, so laterals crossing from cut onto fill lose fall and dip into bellies. And the hill country around this valley has a serious wildfire history, with major fires having burned through within recent memory. Burned slopes turn water-repellent and shed runoff and sediment far more readily in the following storm seasons, which can scour or load buried utilities on the hillside margins.
We camera the full run and locate before quoting, because the three mechanisms need different answers.
Around Simi Valley
We regularly work near:
- 📍Ronald Reagan Presidential Library
- 📍Corriganville Park
- 📍Rancho Simi Community Park
- 📍Santa Susana Pass State Historic Park
Main Sewer Line Cleaning in Simi Valley — Local Notes
- •Inland valley screened from the marine layer, so a hot entirely rainless summer and a severe annual soil cycle
- •Clay-rich valley soils with a real shrink and swell capacity that works clay bell joints apart
- •Mostly 1960s to 1980s construction, spanning later clay and early plastic laterals
- •On plastic pipe the seasonal movement stresses the fixed connections rather than opening joints
- •Cut-and-fill pads produce bellies, and the surrounding hill country has a significant wildfire history