Do Attenuation Tanks Need Maintenance?

Are you wondering if your attenuation tank needs regular maintenance to keep functioning effectively? The answer is yes. Attenuation tanks play an important role in managing stormwater, especially in areas prone to heavy rainfall, and maintaining them is key to ensuring they perform optimally.

Maintaining an attenuation tank is important not only for its longevity but also for ensuring it functions effectively in managing stormwater. 

In this blog, we’ll discuss what attenuation tanks are, why they need to be maintained, and how you can keep yours in top condition. We’ll cover everything from basic maintenance steps to recognising when it’s time to call in the professionals. 

So, let’s get into the details and ensure your system is at its best!

What Are Attenuation Tanks?

Attenuation tanks are large containers used to collect and store excess rainwater, preventing it from flooding streets and buildings. They work by holding onto the water during heavy rain and slowly releasing it back into the ground or sewer systems, controlling the flow to avoid overwhelming the drainage systems. This process is essential for managing water levels, especially in areas that see a lot of rainfall.

Why is Maintenance Essential for Attenuation Tanks?

Maintaining attenuation tanks is important because it helps them last longer. Just like any other part of a building or system, these tanks can suffer from wear and tear.

Regular checks and fixes keep them in good shape, preventing leaks or damage that can lead to bigger problems. When a tank is well-maintained, it won’t need costly replacements as often, saving money in the long run.

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Additionally, well-maintained tanks contribute to environmental conservation. They help ensure that the managed stormwater remains clean and is less likely to carry pollutants into natural waterways.

Regular maintenance checks also offer opportunities to upgrade systems with more efficient or environmentally friendly technologies as they become available. Thus, the routine upkeep of attenuation tanks is not only a practical measure for infrastructure longevity but also an essential practice for sustainable water management.

How Does Maintenance Affect Stormwater Management?

Proper maintenance directly affects how well an attenuation tank manages stormwater. A well-kept tank performs efficiently, controlling the release of water at a rate that the local drainage system can handle. This ensures that streets and properties stay flood-free even during heavy rains.

On the other hand, a neglected tank might clog or malfunction, leading to uncontrolled water flow and possible flooding.

Regular maintenance also helps to preserve the tank’s capacity to cope with sudden influxes of water during storms. The coping capacity is much needed during extreme weather events, where the volume of water can be substantial.

By ensuring that the tank is free from blockages and structural issues, it can hold and release water as designed, minimising the risk of the drainage systems.

What Are the Essential Maintenance Steps for Attenuation Tanks?

Here are few maintenance steps for attenuation tanks you can consider:

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Regular Inspection Schedules

It’s essential to regularly inspect attenuation tanks, ideally yearly or more often in areas with heavy rainfall or older systems. These inspections can catch potential issues early, preventing costly repairs.

Cleaning and Removing Debris

Accumulation of leaves, dirt, and other debris in attenuation tanks can block water flow and reduce capacity. Regular cleaning ensures the tank can efficiently manage rainwater.

Checking and Repairing Structural Components

Inspect the tank for cracks, leaks, or signs of wear during routine checks. Quick repairs maintain the tank’s integrity and prevent major damages.

Monitoring and Maintaining Ancillary Equipment

Regularly test and maintain pumps, valves, and other major equipment to ensure optimal operation. Maintenance tasks include lubricating moving parts, replacing worn components, and securing electrical connections to avoid operational failures.

How Often Should You Inspect and Maintain?

The frequency of maintenance for attenuation tanks can vary depending on several factors, like the type of tank and its location. Here are following:

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Type of Tank: 

Underground tanks may require more frequent checks as they are prone to collecting debris and are affected by soil movements. Plastic tanks, while resistant to corrosion, might need regular inspections for any physical deformations or damages. Concrete tanks are very durable but should be checked for any cracks or leaks.


Tanks in areas with high rainfall or frequent storms should be inspected more often, as they work harder to manage larger volumes of water. Similarly, tanks located in areas with lots of trees might need more frequent cleaning to remove leaves and natural debris.


Tanks that are used more intensively, such as in commercial settings, might need more frequent inspections and maintenance than those in residential areas.

It’s a good idea to perform a basic inspection at least once a year. However, for tanks in challenging environments or those that are important to infrastructure, every six months is advisable. This ensures your system remains in optimal working condition, managing stormwater effectively and preventing any potential issues.

What Happens If You Neglect Tank Maintenance?

Neglecting the maintenance of attenuation tanks can lead to several serious problems. Firstly, if tanks aren’t regularly cleaned and inspected, they can fill up with debris like leaves and dirt. This buildup reduces the amount of water the tank can hold, making it more likely to overflow during heavy rain, which can cause flooding.

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Additionally, without regular checks, small issues such as cracks or leaks in the tank might not be noticed until they become major problems. These structural issues can compromise the tank’s ability to function properly and might even lead to a complete failure, requiring expensive repairs or replacements.

Lastly, when tanks are not properly maintained, their efficiency in managing stormwater significantly decreases. This inefficiency can stress the local drainage systems, leading to potential environmental damage and an increased risk of water pollution.


Regular maintenance of attenuation tanks is not just a precaution; it’s a necessity. By keeping these tanks in good condition through routine inspections, cleaning, and repairs, you can prevent costly damages, ensure effective stormwater management, and protect the environment. Regular upkeep helps these systems perform their critical role in flood prevention and water management efficiently.

If you’re looking for attenuation tanks for your system, consider reaching out to the experts at Resolute Civils. Our professional team is equipped to provide tailored attenuation tanks that will function optimally for your property. Contact us today!


Do attenuation tanks require regular maintenance?

Yes, regular maintenance is essential to ensure attenuation tanks function properly and efficiently manage stormwater.

How often should attenuation tanks be inspected?

Attenuation tanks should ideally be inspected at least annually, or more frequently in areas with high rainfall or older systems.

Can I perform maintenance on an attenuation tank myself?

Some basic maintenance tasks can be performed by individuals, but professional help is recommended for thorough inspections and repairs.

What are the signs that an attenuation tank needs maintenance?

Signs include visible cracks or damage, poor water flow, or when the tank does not effectively manage stormwater during rainfall.

What is the risk of ignoring minor damage to an attenuation tank?

Minor damage can escalate to major issues, such as structural failures or severe flooding, if not addressed quickly.

Why is cleaning important for the efficiency of attenuation tanks?

Cleaning removes blockages and debris, ensuring the tank has full capacity to manage stormwater and prevent overflow.

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