Yes — a backing-up floor drain is one of the more urgent plumbing calls we handle, and Done’s drain team can diagnose and clear the problem quickly. A floor drain that’s overflowing or holding standing water usually signals a blockage somewhere in the drain line itself or, more seriously, in the main sewer line that the floor drain connects to. Identifying which one is the culprit determines the right fix.

Why Floor Drains Back Up

Floor drains in basements, laundry rooms, garages, and utility areas are connected directly to your home’s main drain system. Because they sit at the lowest point of a home’s plumbing, they’re often the first place where a main line backup becomes visible — wastewater has nowhere else to go, so it surfaces through the floor drain. This is different from a clog localized to the floor drain itself, though both are possible.

Common causes of floor drain backups include:

  • A main sewer line blockage (root intrusion, grease buildup, debris, or a collapsed section of pipe)
  • A clog in the floor drain’s own trap or the short lateral line connecting it to the main drain
  • A dry or evaporated P-trap that has allowed sewer gases — and eventually debris — to accumulate
  • A backpitch in the drain line (a low spot that holds water and collects sediment)
  • A city sewer surcharge during heavy rainfall pushing back through private lines

How Done Diagnoses a Floor Drain Backup

Our first step is to determine whether the problem is isolated to the floor drain or whether other fixtures in the house are also draining slowly or gurgling. If the backup is happening at the floor drain but every other fixture seems fine, the issue is likely limited to that drain’s line. If you’re also noticing slow toilets, gurgling sounds from other drains, or backups in tubs and sinks, the main sewer line is almost certainly involved.

A sewer camera inspection is the most reliable way to identify the exact location and cause of the blockage. Done uses camera equipment to run an inspection through your drain lines, giving us a clear picture of what’s happening inside the pipe — whether that’s a root mass, a grease accumulation, a cracked pipe, or a simple debris clog.

What the Fix Usually Looks Like

If the clog is localized to the floor drain or its lateral line, a cable machine (drain snake or rooter) is usually the right tool — it physically breaks up and removes the obstruction. For more stubborn buildups or recurring clogs, hydro jetting is more effective: high-pressure water scours the pipe walls clean rather than just punching a hole through the clog.

If the main sewer line is involved, repairs range from a straightforward cable cleaning to a full camera inspection followed by trenchless pipe lining or sewer line replacement, depending on the pipe’s condition. Done’s Front Range crews are experienced with the clay and expansive soils common across the Denver metro, which are a frequent contributor to sewer line shifts and cracks in older homes.

Don’t Wait on a Floor Drain Backup

Standing sewage is a health hazard. If your floor drain is actively overflowing, stop using any water-consuming fixtures (toilets, sinks, washing machine) until the line is cleared. This prevents pushing additional wastewater into a system that has nowhere to send it.

Done can respond urgently when you need us. Visit our emergency drain cleaning page for same-day service, or our drain cleaning page to schedule a non-emergency inspection. If the sewer line itself needs attention, our sewer services team handles everything from camera inspections through full-line replacement.