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Why Does My House Smell Like Sewer in the Summer? Common Causes in Northern Utah Homes

Home | Blog | Published on August 31st, 2026

A sewage-like smell inside your home is hard to ignore, especially when temperatures climb and your house seems to hold onto every unpleasant odor. You may notice it near a bathroom, basement, laundry room, or floor drain and wonder whether the problem is minor or something more serious. If you’re searching for reliable plumbing in Salt Lake City, understanding the common causes of summer sewer odors can help you know when to investigate further.

A Royal plumber cleaning a smelly drain in the shower.

A Dry P-Trap May Be the Culprit

One of the most common reasons for a sewer smell is a dry P-trap. These curved sections of plumbing hold water that creates a barrier between your living space and sewer gases. During hot, dry weather, water can evaporate more quickly, particularly from drains you rarely use.

This can also happen after you’ve been away on vacation. If a basement floor drain, guest bathroom sink, shower, or other fixture hasn’t been used for several days or weeks, its trap may have dried out.

Try running water through infrequently used fixtures to refill the traps. For a floor drain, slowly pouring water into the drain may restore the barrier and eliminate the odor.

Hot Weather Can Make Odors More Noticeable

Summer heat can intensify sewer odors throughout your home. Warm temperatures can increase evaporation from traps and may also cause existing plumbing odors to become more noticeable.

Changes in air pressure and ventilation can contribute, too. If your home has poor drainage ventilation or a plumbing vent issue, sewer gases may not be moving out of the house as they should.

A Blocked or Damaged Sewer Line

If adding water to a dry drain doesn’t solve the problem, you may be dealing with a more significant plumbing issue. A partially blocked sewer line can cause wastewater and gases to back up toward your home.

Tree roots, buildup, damaged pipes, or shifting soil can all contribute to sewer line problems. You may also notice slow drains, gurgling toilets, water backing up into fixtures, or multiple drains developing unpleasant odors.

These warning signs mean it’s time to have the plumbing inspected rather than simply masking the smell.

Don’t Ignore Persistent Sewer Odors

A sewage smell that keeps returning deserves attention. Sewer gases are unpleasant and can potentially create health and safety concerns when they accumulate indoors. Finding the source early can also help prevent a relatively manageable plumbing repair from becoming a much larger problem.

If the odor seems strongest around a floor drain or in the basement, check whether the drain has been used recently and whether its trap still contains water. When a sewer smell continues after you refill a dry trap, professional troubleshooting can help identify hidden leaks, venting problems, or drainage issues before they become more disruptive.

If the odor appeared after a vacation, start by checking rarely used drains. If the smell persists, comes from multiple drains, or occurs alongside drainage problems, let a professional determine what’s happening.

At Royal Total Home Services, we can help identify the source of unusual plumbing odors and recommend the right solution for your Northern Utah home.

Contact Royal Total Home Services to schedule a plumbing appointment in Salt Lake City.

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