Drains, Sewers & Septic Tanks

Few of us like to think too much about how wastewater or surface water runoff gets from their home, workplace or business to a place of treatment and/or safe disposal. But, when the infrastructure that either transports or treats this water fails, the resultant problems can be unpleasant, costly to rectify, and damaging to the environment. Such failures can also lead to ‘Damage to Underground Services Claims' to insurers, litigation, and even prosecution.

Failures of the infrastructure (or ‘sewerage’) which transports wastewater and surface water to a place of treatment can be caused by a wide variety of factors including:

Whilst failures of large-scale sewage pumping stations and wastewater treatment plants (operated by the twelve water and sewerage companies in the UK) are rare, failures of smaller, privately operated sewage pumping stations, are comparatively common. This includes failures in as well as failures of the ‘off-mains’ wastewater disposal systems that serve around 4% of the UK population. Such failures can be caused by several factors including: incorrect installation, inadequate maintenance, direct physical damage, or components of a particular system having reached the end of their serviceable lives.

Following the introduction of the General Binding Rules for Small Sewage Discharges in January 2015, both the number of privately-operated systems being identified as failing, and the cost of installing replacement systems has increased.

If you are dealing with a case involving the failure of a below ground drainage system, pumping station, septic tank or ‘package’ sewage treatment plant, Hawkins can provide an expert who is familiar with all aspects of a case and can offer clarity and answers to your questions.


We have the technical knowledge and experience to tell you why a drainage system, pumping station or wastewater disposal system failed.

  • We provide you with the answers you need to determine why an incident occurred.
  • We have the necessary knowledge to investigate all aspects of a drainage, pumping station or wastewater disposal system failure.
  • We can help you to determine if an incident could have been avoided.
  • We support subrogation/recovery efforts.
  • We help you to make decisions regarding where legal responsibilities/liabilities lie.
  • We help you to defend wrongful claims.
  • We produce reports suitable for Court and litigation.

Examples of Typical cases

Please complete the enquiry form or give us a call to discuss your requirements with any drainage or wastewater disposal related matters.

The list below provides a few examples of cases which we investigate regularly or have investigated in the past.




We like to speak to you before we conduct any work, to ensure that we can add value to the case.  These discussions help us to understand your requirements, as well as determining how much information is already available, including for example, service records, first-hand witness accounts, photographs, and videos.  We are also happy to provide you with an estimate of the cost of conducting a forensic investigation.



If required and with your agreement, we will arrange to undertake a detailed, on-site investigation. 



Once our examination is complete, we will discuss our findings with you and prepare a report containing a detailed account of our investigation, conclusions, and where appropriate, further work or advice.


Related areas of expertise

Escapes of Water, Oil & Gas

The frequency of escape of water, oil and gas cases are increasing, along with the average cost of reinstating the resulting damage. With pipework routed through the fabric of our homes, businesses and infrastructure, small leaks can quickly become big problems.

Civil & Structural Engineering

Whether it is a subsiding foundation, a collapsing structure or a flooding drainage system, it can be hard to understand at first glance what part of a large system has gone wrong.

Contamination & Pollution

Fires, explosions, floods, water and chemical leaks, building collapses and other calamities can give rise to issues of contamination. It is not uncommon for machinery, building structures, stock etc. to become contaminated outside of the obvious areas where items are burnt, submerged, crushed or otherwise directly damaged during the incident.

Building Defects & Regulations

A building defect can be described as any deficiency or shortcoming in the performance or function of a building that prevents it from satisfying statutory or user requirements. Building defects fall broadly into three categories:

Related Insights

Iron is one of the most common and important metals on earth and forms the basis of the most widely used group of metallic materials, steels. Steels can be manufactured cheaply, in large volumes, and provide a range of useful mechanical properties; hardness, strength, ease of machinability, heat resistance, corrosion resistance etc. The properties of steel can be altered by the addition or removal of chemical elements or by heat treatment. Hence, the performance and longevity of steel components often relies on correct property specification and manufacture. If, for instance, a steel application requires exemplary corrosion resistance, but the steel has been incorrectly manufactured or specified, the component will be unlikely to perform effectively and may fail prematurely.
Control systems are an intrinsic and abundant part of modern life; they control everything from personal aspects of our lives, such as our central heating and the engines of our cars, to massive industrial automation, in industries like factories, distribution warehouses and transportation links. They are responsible for not only completing a task, but ensuring that it is done quickly, efficiently and safely. This article will discuss the constraints imposed on a control system with huge responsibilities, which must function within a challenging, underwater environment.