How to Get Rid of Sewer Flies in RV Toilet

How to Get Rid of Sewer Flies in RV Toilet

Sewer flies, also known as drain flies or moth flies, are tiny, annoying insects that can quickly become a nuisance in your RV toilet. These flies breed and thrive in moist environments, such as sewage systems or stagnant water. If you’re dealing with an infestation of sewer flies in your RV toilet, here are some effective methods to get rid of them.

1. Identify the Source
Before taking any action, it’s essential to identify the source of the problem. Check for any leaks or cracks in the plumbing system, as sewer flies often breed in stagnant water. Ensure that all pipes are properly sealed and there are no areas of excess moisture in or around the toilet.

2. Clean and Sanitize
Thoroughly clean and sanitize your RV toilet. Use a toilet brush and a suitable cleaner to scrub the bowl, paying close attention to any areas where flies may lay eggs. Additionally, clean the surrounding areas, such as the floor and walls, as flies may also lay eggs on these surfaces.

3. Remove Organic Matter
Sewer flies feed on organic matter, so it’s crucial to remove any potential food sources. Regularly empty and clean the holding tank to eliminate any buildup of waste that may attract the flies. Avoid leaving food or dirty dishes in the sink, as these can also attract them.

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4. Use Biological Drain Cleaners
Biological drain cleaners can help break down organic matter and eliminate the breeding grounds for sewer flies. These cleaners contain bacteria that eat away at the waste buildup in the pipes, reducing the fly population. Follow the instructions carefully when using these products.

5. Install Fly Screens
To prevent sewer flies from entering your RV through the toilet, consider installing fly screens. These screens are specifically designed to keep flies and other insects out while allowing water and waste to flow freely. They are easy to install and can be a long-term solution to prevent further infestations.

6. Use Insecticides
If the infestation is severe and other methods have not been successful, you may need to resort to using insecticides. There are various insecticide sprays and foggers available that are specifically formulated to target sewer flies. Follow the instructions on the packaging and use caution when applying these products.

7. Regular Maintenance
Prevention is always better than dealing with an infestation. Regularly maintain your RV toilet and plumbing system to prevent sewer flies from returning. Empty the holding tank regularly, fix any leaks promptly, and keep the toilet and surrounding areas clean and dry.


1. What causes sewer flies in an RV toilet?
Sewer flies are attracted to moist environments and organic matter. If there are leaks or excess moisture in your RV toilet or plumbing system, it provides an ideal breeding ground for these flies.

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2. Are sewer flies harmful?
Sewer flies themselves are not harmful, but their presence can be bothersome and unsanitary. They can also be an indication of a larger plumbing issue that needs to be addressed.

3. Can sewer flies infest other parts of the RV?
While sewer flies are typically found near plumbing fixtures, they can potentially infest other areas of the RV if there are suitable breeding grounds, such as stagnant water or organic matter.

4. Can bleach help get rid of sewer flies?
Bleach can be used as a cleaning agent to eliminate sewer flies, as it kills the larvae and eggs. However, it is important to use it sparingly and dilute it properly to avoid damaging the plumbing system.

5. How long does it take to get rid of sewer flies?
The time it takes to completely eliminate a sewer fly infestation can vary depending on the severity of the problem. With proper cleaning, sanitation, and maintenance, it can take anywhere from a few days to a couple of weeks.

6. Can sewer flies come back after being eliminated?
If the underlying cause of the infestation, such as leaks or excess moisture, is not addressed, sewer flies can return. Regular maintenance and preventive measures are essential to keep them from coming back.

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7. Are there any natural remedies to get rid of sewer flies?
Yes, there are natural remedies you can try, such as using vinegar, baking soda, or essential oils to repel sewer flies. However, these methods may not be as effective as other solutions and may require additional effort and persistence.

In conclusion, getting rid of sewer flies in your RV toilet requires a combination of cleaning, sanitation, and regular maintenance. By identifying and addressing the underlying causes, you can eliminate these pests and prevent future infestations, ensuring a clean and pleasant RV experience.