What it means
The main sewer line collects every branch drain and waste line and slopes toward the street or septic tank. Materials include clay, cast iron, ABS, and PVC depending on era and jurisdiction.
Bellies, offset joints, and root intrusion cause backups throughout the house. Trenchless methods can rehabilitate some lines without full yard excavation.
Why it matters in Santa Cruz County
Long laterals on wide lots in Soquel and Corralitos cross tree root zones and agricultural drainage. Coastal clay pipes near the ocean shift in sandy soil during wet winters, leading to joint separation.
Homeowner tip
Multiple fixtures backing up at once usually means the main sewer line, not individual drain clogs.
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Related glossary terms
Also explore the Septic Glossary or call 831.225.4344 with questions about your property.