Most sewer trouble in Orange County comes down to an aging private lateral: the pipe from your house to the public main. In the postwar tracts of north and central OC that pipe is often original clay or cast iron, and tree roots, cracked joints and scale are the usual causes of slow drains and backups. Newer South County homes mostly have plastic pipe, which resists roots but can still sag or separate.
Start with a camera inspection. A camera run down the line shows whether you are looking at a root intrusion that cleaning will clear for a while, a single bad section that a spot repair can fix, a line that can be lined from the inside, or a pipe that has to be replaced. Ask for the video and the footage marks. Without them, quotes for very different jobs look alike.
Know your options. Trenchless repair works through small access pits: pipe lining (CIPP) builds a new pipe inside the old one, and pipe bursting pulls a new pipe through while breaking the old one apart. Traditional sewer line replacement digs a trench. Trenchless often saves driveways, hardscape and landscaping; digging can still be the right call for a collapsed or badly sagging line.
Check who is responsible and who pulls the permit. In most OC cities the homeowner owns the lateral up to the public main, and repairs usually need a city or sewer-agency permit. Ask your agency where your responsibility ends.
Compare like with like. Get two or three written quotes with the same scope: method, length, depth, cleanouts, permit and restoration. Check each contractor's license with the California CSLB and ask what warranty they give in writing. Our cost guide covers general price ranges.