The clearest signs that you need professional drain cleaning are drains that empty slowly, recurring clogs that come back after DIY treatment, gurgling sounds from drains or toilets, foul odors rising from drains, and water backing up into a sink, tub, or floor drain when another fixture is used. Any one of these is worth a professional look — more than one appearing at the same time usually indicates a main line issue rather than a localized clog.

Slow Drains That Aren’t Getting Better

A single slow drain — a bathroom sink that takes a minute to empty — is usually a localized issue: hair and soap buildup near the stopper. That’s often something a homeowner can address with a drain snake or hair catcher cleanup. But when the same drain is slow despite clearing it, or when multiple drains in the house drain slowly at the same time, the restriction is deeper in the line and a cable or retail drain cleaner won’t reach it. Professional drain cleaning uses equipment long enough and powerful enough to address buildup well into the main line, not just the first few feet of drain pipe.

Clogs That Keep Coming Back

If you’ve snaked a drain or used a chemical drain cleaner and the clog returns within days or weeks, there are two likely explanations: the clog was never fully cleared (the snake punched a hole through it rather than removing it), or the underlying cause of the clog wasn’t addressed. A grease coating on pipe walls, a root mass inside a sewer line, or a scale buildup that narrows the pipe will cause recurring clogs until the pipe wall is cleaned — which requires hydrojetting or mechanical cleaning with the right equipment.

Gurgling Sounds After Draining

Gurgling is the sound of air moving through a partially blocked pipe. When water drains and has to force its way past a restriction, it pulls air behind it, producing a bubbling or gurgling noise at the drain or in a nearby toilet. A toilet that gurgles when the bathroom sink drains — or that bubbles when someone runs the washing machine — is a sign that the shared sewer line has a partial blockage that’s creating negative pressure. This symptom often appears before a full backup and is a reliable warning that professional drain cleaning is needed soon.

Sewage or Rotten Egg Odors

Occasional drain odors from a dry P-trap are normal — the P-trap is the curved section of pipe under every drain that holds water to block sewer gas. If a drain hasn’t been used and the trap dries out, running water restores the seal and the odor goes away. But persistent sewage odors that return despite running water often indicate organic buildup inside the drain line itself — biofilm, grease, or debris that is actively decomposing. Professional cleaning removes this material. If odors persist after cleaning, a camera inspection can determine whether there’s a venting problem or a crack in the line allowing sewer gas to escape.

Water Backing Up in Unexpected Places

If running the kitchen sink causes the floor drain in the basement to back up, or flushing a toilet causes water to appear in a tub drain, water is finding the path of least resistance when the main line is blocked or restricted. This cross-drain backup is a clear signal that the obstruction is in the main sewer line — downstream of where all the fixture drains connect. It requires main line cleaning, not fixture-level work, and it may also warrant a sewer camera inspection to rule out a more serious pipe problem.

When to Call for Emergency Service

If sewage is actively backing up into your home — rising in a floor drain, overflowing from a toilet, or surfacing in a tub — that is an emergency. Stop using all water-dependent fixtures immediately to avoid adding more volume to an already-overwhelmed line, and call for emergency drain cleaning. Done offers emergency service for exactly this situation.

  • Multiple slow drains throughout the house — not just one fixture
  • Clogs that return within days or weeks of DIY treatment
  • Gurgling sounds in drains or toilets when another fixture drains
  • Persistent sewage or rotten egg odors from drain openings
  • Water backing up in an unexpected fixture when another is used
  • Active sewage backup — call immediately and stop using water

Noticing any of these signs in your Denver-area home? Schedule professional drain cleaning with Done before the situation becomes an emergency — or call our emergency line if the backup is already happening.