Laundry Room Septic Odor

This post may contain affiliate links. This means I will make a commission at no extra cost to you should you click through and make a purchase. Read the Affiliate Disclaimer and Privacy Policy.



Laundry room septic odor can be a frustrating and unpleasant problem for homeowners. The smell of sewage or rotten eggs in a laundry room could indicate a problem with the septic system. There are several possible causes of this odor, including malfunctioning septic tanks, flooding, clogs, blocked septic tank air vent and leaks.

The smell of rotten eggs is from hydrogen sulphide gas which is a byproduct of the decomposition of organic matter in the septic tank.

Laundry Room Septic Odor: Malfunctioning septic tanks

Malfunctioning septic tanks can be a major cause of laundry room septic odor. A malfunctioning septic tank can cause sewage to back up into the house. This results in unpleasant odors and potential health hazards. This can happen if the septic tank becomes overloaded with waste, if the drain field becomes saturated, or if the tank is not properly maintained.


Flooding can also cause laundry room septic odor. If the septic system becomes flooded, waste can overflow and enter the house, resulting in unpleasant odors. Flooding can occur due to heavy rains, a broken septic pipe, or a clogged drain.

Laundry Room Septic Odor: Clogs

Clogs in the septic system can also cause laundry room septic odor. Blockages can occur in the pipes leading to and from the septic tank, as well as in the tank itself. These blockages can prevent waste from flowing properly through the system, causing it to back up and create unpleasant odors.

FOGs are a common cause of septic system clogs. When FOGs are poured down the drain, they can solidify and stick to the inside of pipes and the septic tank. This can cause blockages and impede the proper functioning of the septic system.

Female sanitary pads, latex condoms and flushable wipes are also common causes of septic system clogs. These items are not biodegradable and can easily clog pipes and tanks.

It’s important to note that these items should not be flushed down the toilet as they can cause damage to the septic system. Instead, they should be disposed of in the trash. To prevent clogs and maintain the proper functioning of the septic system, it’s important to be mindful of what is flushed down the toilet and to have the septic tank pumped out regularly by a professional.

Septic system clogs can be caused by a variety of factors, including the presence of non-biodegradable household waste, FOGs (fats, oils, and grease), and certain personal hygiene items. Non-biodegradable household waste, such as plastic bags, disposable diapers, and cigarette butts, can clog the septic system by not breaking down properly and causing blockages.

Rotten Eggs Smell From A Washing Machine

A rotten eggs smell from a washing machine can be caused by a buildup of dirt, mildew, mold and lint in the machine, which can create an unpleasant odor. Additionally, the smell can also be caused by hydrogen sulphide gas, which is a byproduct of the decomposition of organic matter in the septic tank. The gas can escape through the washing machine drain and create a foul smell in the laundry room. In both cases, it is important to properly clean and maintain the washing machine and to address any issues with the septic system to eliminate the odor.

Laundry Room Septic Odor: Septic Air Vent

Blocked septic air vents can also be a cause of laundry room septic odor. These vents allow air to flow out of the septic tank. They are necessary to keep the system functioning properly. If the vents become blocked, the system can become pressurized, causing waste to back up into the house and creating unpleasant odors.

How To Get Rid Of Odors

There are several natural remedies that can be used to get rid of odors in a laundry room. Some of the most effective include:

  1. Baking soda: Add baking soda to the washing machine and run a hot water cycle. Baking soda is a natural deodorizer that can help to neutralize odors.
  2. Vinegar: Add a cup of white vinegar to the washing machine’s rinse cycle. Vinegar is a natural disinfectant that can help to eliminate bacteria and mold, which can contribute to odors.
  3. Mix 1/4 cup of lemon juice with a cup of water and pour it into the washing machine’s detergent dispenser. Run a hot water cycle to help remove odors and leave your laundry smelling fresh.
  4. Essential oils can be used to add a pleasant fragrance to the laundry room.
  5. Activated Charcoal: Activated charcoal is a natural odor absorber and can be used to remove odors from the laundry room. You can place activated charcoal in the septic tank air vents.
  6. Septic systems are delicate and using the wrong detergents can result in clogging and buildup, leading to unpleasant odors in the laundry room and surrounding areas. To avoid this, it is essential to choose a laundry detergent that is safe for septic systems. The biodegradability of these detergents helps keep the septic system running smoothly, reducing the chance of odors.

Final Thoughts

In conclusion, laundry room septic odor can be caused by a variety of factors. To prevent and eliminate laundry room septic odor, it is important to properly maintain the septic system and address any issues as soon as they arise. Regular inspections and pumping by a professional can help keep your septic system functioning properly and prevent unpleasant odors. Using the right septic safe laundry detergent for septic systems is crucial for maintaining a healthy and odor-free laundry room. The best laundry detergent for septic systems are specifically formulated to be biodegradable.