Treatment plant, septic tank & pumping station inspection chamber lids.
At ASL Limited, we are passionate about providing unmatched customer service and addressing drainage issues with professionalism and expertise. Our focus is not just on fixing drainage problems when they happen but on preventing them before they arise. We understand that drainage issues can occur at the most inconvenient times, and that’s where our proactive approach comes in—we aim to stop problems before they cause chaos in your life.
We work closely with homeowners, councils, and homebuyers, offering a rapid response to blocked drains through our emergency callout service. Whether it’s a small domestic problem or a larger, more complex drainage issue, our expert teams are on hand to assess, fix, and provide long-term solutions. When you contact ASL Limited, you can rest assured that a trained professional will be with you promptly, ensuring the issue is resolved before it leads to more serious complications.

Addressing warning signs early
Often, drainage problems start with small, easily ignored warning signs that indicate a larger issue brewing beneath the surface. At ASL Limited, we believe in tackling these signs head-on. Leaving them unchecked could not only result in more severe damage but also cause significant environmental issues, such as the pollution of rivers and streams due to untreated sewage. Ignoring a drainage problem never makes it go away; it often leads to bigger, more costly fixes later on.
Take, for example, a recent case where one of our teams was dispatched to resolve an issue with a customer's treatment plant. Unfortunately, due to a missing air blower—an essential component for treating sewage water—the system failed, and the untreated water began polluting a nearby river. It wasn’t just a technical failure; it was a communication breakdown. The team on-site didn’t have the combined alarm and flashing light compressor we had recently implemented as a standard for all new installations. This resulted in a temporary fix being delayed, leading to environmental damage.
We recognised this as a learning opportunity. While the team had followed procedure, the failure to install a standard compressor until the correct one could be fitted meant the customer was left without proper treatment for too long. At ASL Limited, we strive to serve and protect our customers and the environment, which is why we quickly reviewed our internal processes and ensured better communication and quicker responses to these kinds of challenges.

Inspections to prevent flooding and environmental damage
Drainage systems, especially those connected to treatment plants and septic tanks, are sensitive to water influx. Surface water or roof water entering the drains can overwhelm the system, leading to poor-quality water being released into rivers and streams. This is a significant environmental risk that can be avoided with regular inspections and proper maintenance. At ASL Limited, our inspections focus on identifying any signs of roof or surface water entering your drains, which can lead to overloaded treatment systems and potential pollution.
During a heavy rainfall, these issues can become particularly acute. Water that enters the system in a surge can disturb the separation process in septic tanks or treatment plants, causing untreated or partially treated water to bypass the barriers designed to keep sewage from entering natural water sources. We advise our clients to carry out regular CCTV inspections of their drainage systems, especially after heavy rainfall or if they suspect surface water is entering the system.
Addressing surface water issues
Surface water entering your drainage system can cause severe problems, particularly during storms or periods of heavy rain. If your inspection chambers have inadequate covers, or if there are broken pipes or open joints, surface water can enter your drainage system, causing it to flood. When this happens, it not only overwhelms the system but can lead to untreated sewage mixing with stormwater, creating a significant environmental hazard.
If you have any suspicion that your system might be vulnerable to surface water intrusion, we recommend scheduling a CCTV drainage inspection. This will help identify any potential weak points in the system, including downpipes or gullies that may be connected to the foul drainage system. Once identified, these issues can be resolved to ensure your drainage system functions as it should, without the risk of flooding or pollution.
At ASL Limited, we are committed to providing top-tier drainage solutions and preventative services that keep your home and the environment safe. Whether it’s routine inspections or emergency callouts, we are here to support you with expert advice and quality service.
If you have a drainage emergency or require an inspection, contact us today at ASL Drainage Services.