The last thing anyone wants when using their eco-friendly compost toilet is to be swarmed by buzzing flies. As someone who has dealt with the annoyance of flies in my compost toilet, I understand the frustration and discomfort these tiny pests can cause. That’s why I’ve decided to share my experience and knowledge on getting rid of flies in compost toilets effectively and sustainably.

In this blog post, we’ll explore the reasons behind fly infestations in compost toilets and offer practical solutions to address the issue. Following these tips and methods, you can maintain a clean, hygienic, and fly-free compost toilet environment. Let’s dive in and tackle the problem of how to get rid of flies in compost toilets once and for all.

Understanding Why Flies Are Attracted to Compost Toilets

Before diving into the solutions, it’s essential to know why flies are attracted to compost toilets in the first place. This knowledge can help you take preventive measures and make your toilet less appealing to these pesky insects.

Flies, especially house flies and fruit flies, are drawn to compost toilets primarily due to the presence of organic waste. As decomposers, flies play a crucial role in breaking down organic matter in the environment. However, they quickly become a nuisance when they make their way into our compost toilets.

Here are the primary reasons flies are attracted to compost toilets:

  1. Odour: Flies have a keen sense of smell and can detect the odours of decomposing waste from a considerable distance. A poorly maintained compost toilet can emit strong odours, luring flies to the source.
  2. Moisture: A damp and moist environment is ideal for flies to lay their eggs, and compost toilets can provide just that. Excess moisture in the composting chamber may result from insufficient ventilation, inadequate cover material, or overuse of water.
  3. Access to food: The organic waste in compost toilets serves as a food source for flies and their larvae. This sustenance allows them to reproduce rapidly, leading to a full-blown infestation if not addressed promptly.
  4. Lack of proper maintenance: Regularly cleaning and maintaining your compost toilet is essential for keeping flies at bay. Failing to do so can create a welcoming environment for these pests to thrive.

Now that we’ve identified why flies are attracted to compost toilets let’s explore the different ways to control and prevent them.

dead flies
How to get rid of flies in compost toilet

Pest Control in Compost Toilets

Effectively managing flies in your compost toilet involves a combination of proactive measures and reactive solutions. Here are some proven pest control methods to help you eliminate and prevent flies from invading your compost toilet:

  1. Install fly screens: One of the simplest ways to prevent flies from entering your compost toilet is to install fly screens on windows and vents. Ensure the screens are well-fitted and free from holes or gaps. This physical barrier allows air circulation while keeping flies and insects out.
  2. Use fly traps: Various fly traps can help reduce the number of flies in and around your compost toilet. Sticky flypaper, UV light traps, and homemade traps using apple cider vinegar and dish soap are all effective options. Place these traps near windows or vents to catch flies as they attempt to enter.
  3. Apply diatomaceous earth: Diatomaceous earth is a natural, non-toxic powder made from the fossilized remains of diatoms, a type of algae. It damages insects’ exoskeletons, causing them to dehydrate and die. Lightly sprinkle diatomaceous earth on the surface of your compost pile to help control fly populations. Be sure to use food-grade diatomaceous earth and wear a mask while applying it to avoid inhaling the fine particles.
  4. Keep the toilet lid closed: This simple habit can significantly prevent flies from accessing the composting chamber. Closing the toilet lid when not in use creates a physical barrier, making it more difficult for flies to reach the organic waste.
  5. Empty and clean the toilet regularly: Regularly emptying your compost toilet and cleaning the chamber is essential for controlling flies. Removing waste and sanitizing the toilet can eliminate fly breeding grounds and prevent infestations.

Now that we’ve covered some effective pest control methods for compost toilets, let’s look at natural ways to repel flies without harsh chemicals.

Neem Oil

Natural Fly Repellents for Compost Toilets

Utilizing natural fly repellents is a safe and eco-friendly way to keep flies at bay without resorting to toxic chemicals. These methods can be easily incorporated into your compost toilet maintenance routine and effectively deter flies from the area. Here are some natural fly repellents you can try:

  1. Essential oils: Many essential oils, such as lavender, eucalyptus, peppermint, and lemongrass, have been found to repel flies. You can create a spray by mixing a few drops of essential oil with water in a spray bottle. Spritz this mixture around your compost toilet area and on the fly screens to deter flies.
  2. Herbs and plants: Some plants naturally repel flies due to their strong fragrance. Planting basil, rosemary, or mint near your compost toilet can help keep flies away. Alternatively, you can create sachets with dried herbs and place them around the toilet to repel flies.
  3. Citronella candles: Citronella oil, derived from lemongrass, is a popular natural insect repellent. Burning citronella candles or using citronella torches around your compost toilet can help deter flies and other insects.
  4. Vinegar: White vinegar can be used to clean and disinfect your compost toilet, making it less attractive to flies. Mix equal vinegar and water in a spray bottle, and use it to clean surfaces, toilet seats, and surrounding areas.
  5. Neem oil: Neem oil is an effective natural insecticide that can help repel flies. Mix a small amount of neem oil with water in a spray bottle and apply it to the compost pile and the toilet’s exterior surfaces.

Using these natural fly repellents can create a more pleasant and eco-friendly compost toilet environment. However, prevention is always the best approach to dealing with flies. Let’s discuss some essential tips for preventing fly infestations in compost toilets.

Preventing Fly Infestations in Compost Toilets

Fresh air

Prevention is critical to keeping flies out of your compost toilet. By following these tips, you can create an environment that is less conducive to fly infestations and maintain a cleaner, more hygienic compost toilet:

  1. Proper ventilation: Ensuring your compost toilet is well-ventilated helps control moisture levels and odours, making it less attractive to flies. Check your ventilation system regularly to ensure it’s functioning correctly and free from obstructions.
  2. Use good cover material: Covering your waste with a generous layer of carbon-rich material, such as sawdust, peat moss, or coconut coir, can help mask odours and absorb moisture. This practice speeds up the composting process and deters flies from laying eggs.
  3. Regular maintenance: Cleaning and maintaining your compost toilet is essential for preventing fly infestations. Empty the toilet regularly, sanitize surfaces, and replace cover materials.
  4. Monitor moisture levels: Excess moisture can create a breeding ground for flies. Monitor the moisture levels in your composting chamber, and adjust your cover material or ventilation as necessary to maintain a balanced environment.
  5. Seal gaps and cracks: Inspect your compost toilet for any holes, damage, or openings that may allow flies to enter. Seal any potential entry points with caulk or weatherstripping to keep flies out.

By combining these preventive measures with the pest control and natural repellent methods discussed earlier, you can effectively keep flies away from your compost toilet and enjoy a more pleasant, hygienic experience.

cleaning equipment
Cleaning is an important part of getting rid of flies in compost toilets


Dealing with flies in compost toilets can be a frustrating and unpleasant experience. Still, you can successfully manage and prevent fly infestations by understanding why they’re attracted to these eco-friendly systems and implementing the right strategies. Remember to properly compost toilet maintenance, employ natural fly repellents, and take preventive measures to create an unwelcoming environment for flies.

Following the tips and methods outlined in this comprehensive guide, you can enjoy the benefits of a compost toilet without the unwanted company of pesky flies. So, take charge of your compost toilet, and enjoy the satisfaction of maintaining a clean, hygienic, and fly-free space.