Surveys and diagnostics

Investigative surveys using the latest technology to understand the condition and layout of drainage infrastructure.

We help customers understand the condition and layout of their drainage network by providing a range of diagnostic and investigative surveys. 

We detect issues with your drainage network including blockages, infiltration, tree root ingress, misconnections, or structural defects, and recommend remedial action to prevent leaks and flooding and ensure compliance.

Our vehicles are equipped with everything needed to fully investigate any drainage issue on the spot, helping to identify the problem and find a solution with minimal disruption.

Our experienced, OS19X-qualified team and advanced equipment allow us to work on private and public sewers, including in confined spaces.


  • Confined space training allows the team to work inside drains and manholes as required.
  • Every customer receives a WinCan report, AutoCAD site drawing and a list of immediate and recommended actions to take.
  • Ability to work on domestic drainage issues as well as public networks.

Added value


We have nine fully-equipped CCTV units capable of surveying pipes from 40mm to 2,500mm diameter.


When a problem arises, we react fast to identify the problem and recommend a solution.


Investing in regular condition surveys can prevent bigger, more costly issues down the line.

Best practice

Mapping site drainage is regarded as best practice by the Environment Agency and can help reduce fines in the event of a pollution incident.

We provide full site connectivity and condition surveys as well as property surveys in advance of construction and development. Surveys can be conducted in response to a specific issue or as part of an ongoing maintenance programme.

CCTV surveys

Our CCTV surveys are used in many situations. Our camera equipment can survey pipes from 40mm upwards, allowing us to assess condition and structural integrity and diagnose blockages or other issues along the whole network, from internal pipework to public sewers.

Our camera vehicles carry the necessary equipment to break through blockages in pipes up to 150mm, so surveying can be completed without the need for a return visit.

We can also conduct CCTV surveys as part of pre-purchase or environmental surveys, to map the drainage infrastructure and ensure discharges are in line with Environment Agency legislation.

Following the survey, all customers receive a WinCan VX report, AutoCAD drawing of the site and drainage layout and recommendations for immediate or future remedial works.

Sonar tracing

Our specialist sonar tracing equipment detects the exact location of any defective or collapsed drains identified as part of the CCTV survey.

We can establish the line, depth, and direction of the drain to help decide on the most suitable method of repair or pinpoint the site for excavation.

Sonar tracing is also used to accurately locate and mark out the drainage prior to building work, to understand where re-routing of pipework may be required and prevent accidental damage during construction.

Manhole surveys

Manhole surveys can be carried out to fill gaps in records, obtain data on critical sewers, address specific issues, or check on general condition. They can be undertaken separately or as part of a full drainage survey.

Surveys are carried out by CCTV and provide the asset owner with detailed information and photographs on the manhole structure and condition, including the diameter of pipe inlets and outlets, depths of inverts and step iron and cover conditions. This allows them to track how the asset is deteriorating and plan maintenance and repairs.

Data is provided to STC25 industry standard and reported via manhole cards or CAD drawings according to client requirements. 

Dye testing

Dye testing detects the flow of water through drains or pipes. It can be used to identify individual flows into a common drain and trace where foul water is entering rivers or streams.

Where a full CCTV survey isn’t required, dye testing can also be used to map drainage and water flows for connectivity surveys.

Odour investigation

Where bad smells are causing problems, we will use a combination of mini camera systems and smoke bombs to check pipework for cracks, gaps, or other possible points of entry.

Hydraulic pressure testing

Hydraulic pressure testing is a way of detecting leaks in underground pipes. Air is pumped into the drain or pipe and if the pressure holds, the line is sound. If the pressure drops, we investigate further and recommend remedial action.

Here to keep your drainage flowing freely

Our experts are available to quickly diagnose issues, provide cost-effective solutions, and carry out routine maintenance to get your drainage network back to normal as soon as possible.

Speak to our experts