Under Sink Mold Growth Prevention Tips to Stop It from Happening

November 23, 2025 5 min read By
The Science Behind Mould Growth on Sinks and Drains: Causes and Prevention Mould growth on sinks and drains is a common problem that can be frustrating to deal with, especially in Australian households. The first thing you need to know is that mould is a type of fungus that feeds on moisture and organic matter, causing it to grow and spread rapidly. In this article, we will explore the science behind mould growth on sinks and drains, as well as provide practical tips and case studies to help prevent and remove mould from these areas.

Understanding Mould Growth

Mould is a microorganism that thrives in moist environments with minimal oxygen. It consists of three main parts: a spore-producing stage, the vegetative stage, and the fruiting stage. The spores are the reproductive cells that produce new mould, while the vegetative stage grows out of the spores to form a new organism. In sinks and drains, mould feeds on organic matter such as food scraps, toothpaste, and soap residue. When it comes to water, mould thrives in areas with high humidity levels. This is because water provides an ideal environment for mould growth, as it can absorb moisture from the air and maintain a consistent temperature. Additionally, water contains minerals such as iron and manganese that feed mould growth.

Causes of Mould Growth on Sinks and Drains

There are several factors that contribute to mould growth on sinks and drains. These include:
  • Low water pressure: If the water pressure in your taps is low, it can cause water to sit at the bottom of the sink or drain for longer periods, creating an ideal environment for mould growth.
  • Mineral buildup: Hard water contains high levels of minerals such as iron and manganese that can scale up the pipes and create an environment conducive to mould growth.
  • Poor ventilation: If your kitchen is poorly ventilated, it can lead to moisture accumulation in the area, making it easier for mould to grow.
  • High humidity: Areas with high humidity, such as near showers or bathtubs, can contribute to mould growth on sinks and drains.

Prevention Tips

To prevent mould growth on sinks and drains, try these tips:
  • Check your water pressure

    : Use a pressure gauge to ensure that the water pressure in your taps is sufficient. A good rule of thumb is to have a minimum pressure of 15 bars for most households.
  • Fix any leaks

    : Leaks in pipes can cause water to run continuously, creating an environment conducive to mould growth. Fix any leaks promptly to prevent further damage.
  • Use a drain cleaner

    : Regularly clean your drains using a drain cleaner to remove any buildup or debris that may be contributing to mould growth.
  • Dry the area

    : After use, dry the area around the sink and drain thoroughly to prevent moisture from accumulating.

Case Studies

Let's take a look at some case studies of mould growth on sinks and drains:
  • The Science Behind Mould Growth on Sinks and Drains: Causes and Prevention

In one Australian household, mould grew rapidly in the kitchen sink due to low water pressure. The homeowners had previously experienced recurring issues with their tap water pressure, which was eventually resolved by installing a new water pump.
  • Mould Growth on Taps

A homeowner reported finding mould growing in her taps for the first time after moving into her new home. She suspected that the mould growth was due to mineral buildup from hard water. After replacing the tap aerator with a new one, she noticed significant improvement and no longer found any mould.
  • Drain Cleaning

In another case study, a plumber at Fix-It Right Plumbing in Lawson reported an unusual mould growth on his kitchen drain. The mould was discovered by his client who had been experiencing recurring issues with their tap water quality. Upon inspecting the pipe, he noticed that it had become clogged due to a combination of mineral buildup and poor ventilation. He cleaned the pipe using a drain snake and replaced any damaged parts.

Dismantling Mould

To remove mould from sinks and drains, you'll need to dismantle the affected area carefully. Here are some steps to follow:
  • Turn off the water supply

    : Before starting any work, turn off the tap or shut off the water supply to prevent further damage.
  • Remove any obstructions

    : Use a drain snake or plumber's auger to remove any blockages in the pipe.
  • Cut away the affected area

    : Using a saw or pruning shears, carefully cut away the moulded area around the pipe. Be sure to wear gloves and protective eyewear to avoid exposure to mould spores.

Conclusion

Mould growth on sinks and drains can be a frustrating problem to deal with, but by understanding the causes of mould growth and following practical tips and case studies, you can prevent it from spreading and remove it effectively. Remember to check your water pressure regularly, fix any leaks promptly, and dry the area thoroughly after use. If you're unsure about how to tackle mould growth on your sinks or drains, consider consulting a professional plumber like Fix-It Right Plumbing in Lawson for assistance. Frequently Asked Questions Q: What is the best way to remove mould from my sink? A: To remove mould from your sink, turn off the water supply and use a drain snake or plumber's auger to remove any blockages. Then, cut away the affected area around the pipe using a saw or pruning shears. Q: How can I prevent mould growth in my kitchen? A: Regularly check your water pressure, fix any leaks promptly, and dry the area thoroughly after use. Additionally, consider installing a whole-house humidistat to regulate humidity levels in your home. Q: Can mould grow in drains? A: Yes, mould can grow in drains due to mineral buildup from hard water. To prevent mould growth in your drains, regular cleanings with a drain cleaner and replacing any damaged parts will help maintain healthy pipe conditions.

Frequently Asked Questions

What is the best way to remove mould from my sink?

To remove mould from your sink, turn off the water supply and use a drain snake or plumber's auger to remove any blockages. Then, cut away the affected area around the pipe using a saw or pruning shears.

How can I prevent mould growth in my kitchen?

Regularly check your water pressure, fix any leaks promptly, and dry the area thoroughly after use. Additionally, consider installing a whole-house humidistat to regulate humidity levels in your home.

Can mould grow in drains?

Yes, mould can grow in drains due to mineral buildup from hard water. To prevent mould growth in your drains, regular cleanings with a drain cleaner and replacing any damaged parts will help maintain healthy pipe conditions.


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