The UK water sector is entering a period of significant change. Increasing environmental expectations, evolving regulation and greater public scrutiny are placing pressure on water companies to improve performance and prevent operational failures before they occur.
Initiatives such as the Government’s Vision for Water, updated Water Industry Regulation Incident (WIRI) guidance and Pollution Incident Reduction Plans (PIRPs) all point in the same direction: the sector is shifting from reacting to incidents towards understanding their causes and preventing recurrence.
Achieving that shift requires more than policy changes. It requires organisations to strengthen their capability to understand failure within increasingly complex operational systems.
And that raises an uncomfortable question.
Are we trying to investigate 21st-century water systems with Root Cause Analysis tools designed for the 1970s?
Increasing complexity across water infrastructure
Modern water infrastructure is highly interconnected. Wastewater treatment works, pumping stations, networks, storm overflows, telemetry systems and operational processes all interact within dynamic environmental conditions.
Incidents rarely have a single isolated cause. More often they arise from chains of contributing factors involving assets, processes, operational decisions and organisational controls.
Understanding those causal chains is essential if organisations are to move beyond incident response towards prevention.
The investigation challenge
Despite the increasing complexity of water infrastructure, many Root Cause Analysis (RCA) approaches have changed little over several decades.
Investigations are still commonly carried out using spreadsheets, static diagrams, narrative reports or workshop exercises using whiteboards and sticky notes.
These methods can generate useful insight in individual cases. However, they also introduce significant limitations when organisations are managing large networks of complex assets.
They tend to be:
- highly dependent on individual investigators
- difficult to standardise across teams
- disconnected from operational evidence
- challenging to compare across multiple incidents
As a result, organisations often struggle to identify patterns across incidents or understand which underlying causes are driving operational failures.
From incident response to prevention
Regulatory expectations increasingly emphasise prevention, transparency and learning from operational events.
Effective Root Cause Analysis plays a central role in enabling that learning.
Robust investigations typically distinguish between three levels of cause:
- Immediate causes – the event that directly triggered the incident
- Underlying causes – the conditions that allowed the failure to occur
- Systemic causes – organisational factors that allowed the issue to develop or remain undetected
Within the What Caused This platform these investigation layers are structured as Primary Causes, Contributory Causes and Root Causes, helping investigators analyse incidents consistently and identify recurring patterns.
Modernising RCA for complex systems
As water infrastructure becomes more complex and expectations increase, the limitations of document-based RCA become more apparent.
Modern investigation approaches increasingly require tools that can guide investigators through structured causal reasoning, capture evidence alongside analysis and connect causes directly to corrective and preventive actions.
A number of UK water companies are already exploring digital approaches to Root Cause Analysis as they look to strengthen investigation consistency and improve learning across operational and environmental incidents.
In this way, RCA evolves from a reporting exercise into a capability that supports system-wide learning.
Looking ahead
Delivering the ambitions set out in the Vision for Water will depend not only on regulation and investment, but also on how effectively organisations learn from operational experience.
If the sector is serious about preventing incidents in increasingly complex systems, investigation practices must evolve accordingly.
Continuing to investigate 21st-century water systems with 1970s RCA tools is unlikely to be enough.
Author
Jonathan Batchelor is CEO of What Caused This, a company developing digital Root Cause Analysis platforms used by organisations investigating complex operational and environmental incidents.
More information:
https://whatcausedthis.com/
Further information about Root Cause Analysis for water companies:
https://whatcausedthis.com/rca-software-for-water-companies/
