Quick answer
- One slow drain = a local clog near that fixture
- Several drains backing up = a main-line or sewer problem
- Grease, 'flushable' wipes, and coffee grounds are top offenders
- Recurring clogs in the same spot usually need professional clearing
When this applies
Try this first (carefully)
Hot water and a plunger clear many simple clogs. Skip chemical drain cleaners — they're hard on pipes and rarely fix the real blockage. If it keeps coming back, or more than one fixture is affected, it's time for a camera and professional clearing.
How it works
How clogs build
Grease cools and coats the pipe walls; hair and soap bind to it; over time the opening narrows until flow slows or stops. In older neighborhoods, tree roots can enter pipe joints and catch debris.
What to watch out for
Repeated main-line backups
If your lowest drains (tub, floor drain) back up when you run water elsewhere, the main line is blocked — often by roots. A camera inspection finds the cause; hydro-jetting clears it thoroughly.
Chemical-cleaner damage
Caustic drain cleaners can corrode older pipes and seals and seldom clear a true blockage — they just sit on top of it. Mechanical clearing is safer and more effective.
Schedule service
Frequently asked questions
Are chemical drain cleaners safe to use?
We don't recommend them. They can damage older pipes and seals, are hazardous to handle, and usually don't clear the actual blockage. Mechanical snaking or hydro-jetting is safer and more reliable.
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Reviewed by John Stevenson Plumbing, Heating & Air. Based on the drain and sewer service calls our technicians clear throughout the region. Last updated 2026-06-18.