Keeping your floor drain clear comes down to controlling what goes into it and making sure the drain’s trap stays wet and functional. Floor drains in basements, laundry rooms, utility areas, and garages are built to handle overflow and condensate — not the kind of debris that ends up in them when maintenance is neglected. A few straightforward habits will keep them flowing and odor-free year-round.

Keep the Trap Primed — Especially in Colorado

The P-trap beneath your floor drain holds a small amount of water that acts as a seal against sewer gases. In Colorado’s very dry climate — Denver averages around 14 inches of precipitation annually and indoor relative humidity can drop well below 20% in winter — floor drain traps can evaporate surprisingly quickly, especially in drains that don’t see regular use. A dry trap is one of the most common reasons homeowners notice sewer odors rising from a basement floor drain.

The fix is simple: pour about a quart of water down any floor drain that doesn’t get used regularly, roughly once a month. Adding a small amount of cooking oil on top of the water slows evaporation and extends the time before the trap dries out again. This one habit eliminates most sewer-odor complaints associated with floor drains.

Use a Drain Strainer

Most floor drains come with a removable strainer grate, but the openings are often large enough to let debris through. Adding a fine-mesh strainer insert catches hair, lint, dirt, and small particles before they enter the line. This is especially helpful for laundry room floor drains, which receive lint-laden water from the washing machine, and for garage drains that collect dirt and debris tracked in from outside.

Clean the strainer every month or two — a clogged strainer defeats the purpose and can cause the drain to back up during an overflow event, which is exactly when you need it to work.

Control What Flows Toward the Drain

  • Never pour grease, paint, solvents, or oil down a floor drain — these coat the pipe walls and accumulate over time
  • Sweep garage floors before hosing them down to reduce sediment entering the drain
  • Make sure your water heater’s pressure relief valve drain line is directed to a proper drain, not just the floor, where minerals can accumulate around the drain opening
  • If your washing machine drains to a floor drain, check the lint trap on the machine regularly and consider an inline washing machine drain filter

Watch for Early Warning Signs

A slow-draining floor drain is telling you something before it becomes a backup. Gurgling sounds from the drain when other fixtures are in use — a toilet flushes and the floor drain gurgles — is a sign the main sewer line may have a partial blockage, with your floor drain venting the pressure. Catching this early means a cable cleaning or hydro jetting, not an emergency call with sewage on your basement floor.

In older Denver-area homes, clay sewer lines and the movement caused by Colorado’s expansive clay soils mean root intrusion and joint separation are common over time. A periodic sewer camera inspection — even without a current problem — can catch developing issues before they become failures.

Schedule Periodic Professional Cleaning

Even with good habits, some mineral and debris buildup is inevitable over time. A professional drain cleaning every year or two — either a cable cleaning for routine maintenance or a hydro jet for a more thorough scour — keeps the line in good shape and gives a technician the opportunity to spot any developing problems in the pipe itself.

Done’s drain team serves the entire Denver metro and Front Range. Schedule routine or preventive maintenance through our drain cleaning page, or learn about hydro jetting for a deeper clean. If you’re seeing signs of a main line issue, our sewer services team can run a camera inspection to check the whole system.