The Rise of PFAS Pollution
British watercourses are under increasing pressure. Toxic “forever chemicals” (PFAS) have been detected at concerning levels across the UK, triggering national headlines and growing public scrutiny.
A recent investigation by The Guardian revealed alarmingly high PFAS concentrations at hundreds of sites across England. These persistent substances are often introduced into water systems through inadequate runoff control, drainage failures, or legacy containment infrastructure not designed for modern contaminants.
“Nearly all rivers, lakes and ponds in England tested for a range of PFAS exceed proposed safety limits, with 85% recording levels at least five times higher,” the report noted, citing data from the Environment Agency.
PFAS (per- and polyfluoroalkyl substances) have been widely used in firefighting foams, industrial coatings, and manufacturing processes. They do not break down in the environment. Once released — often via surface water runoff or accidental discharge — they persist indefinitely, accumulating in ecosystems, the food chain, and ultimately, human bodies.
For industrial operators, this is no longer just an environmental issue. It is a compliance, liability, and reputational risk.
The Regulatory Pressure on Industrial Sites
As PFAS contamination moves into the public spotlight, regulatory expectations are evolving quickly.
Operators are now under increasing pressure to:
- Prevent contaminated runoff entering surface waters
- Demonstrate effective emergency containment capability
- Align with guidance such as CIRIA C736
- Meet stricter expectations around pollution prevention and resilience
CIRIA C736, in particular, emphasises the need for reliable containment systems capable of operating under emergency conditions — including firewater runoff and chemical discharge.
For many sites, this presents a challenge.
Legacy drainage infrastructure was never designed to manage contaminants like PFAS, nor to respond rapidly enough during modern incident scenarios.
Traditional Containment Approaches — A Growing Weakness
For decades, manual and motorised penstock valves have been widely used to control drainage and provide containment.
However, their limitations are becoming increasingly apparent:
- Dependence on manual operation during emergencies
- Delays in response when time is critical
- Seal performance issues under real-world conditions
- Vulnerability to corrosion in aggressive environments
- Lack of integration with modern monitoring or alarm systems
In the context of PFAS contamination, these shortcomings are not just operational inconveniences — they represent a real pathway to environmental release.
Contamination events are rarely predictable. In many cases, by the time an issue is identified, pollutants may already have left the site.
The Overlooked Risk: What Happens After the Incident
While attention often focuses on preventing spills or fires, a critical question is frequently overlooked:
What happens to contaminated water once an incident occurs?
PFAS contamination can be mobilised through:
- Firefighting water during emergency response
- Rainfall washing over contaminated surfaces
- Residual chemicals entering drainage systems after an event
Once these pollutants enter surface water networks, they are extremely difficult — and often impossible — to fully remove.
This is why industry guidance increasingly points toward containment at source as the most effective form of protection.
Closing the Containment Gap
Across many industrial and infrastructure sites, the issue is not a lack of awareness — it is a lack of systems capable of responding quickly enough when it matters most.
Modern containment strategies are therefore evolving.
Automated systems, such as ToggleBlok®, are designed to isolate drainage networks immediately when a contamination event is detected. By removing reliance on manual intervention, they significantly reduce the risk of pollutants leaving the site boundary.
For operators reviewing their infrastructure, this shift from manual or passive systems to automated containment is becoming increasingly relevant — particularly where high-risk substances like PFAS are present.
Integrating Containment into Site Design
Effective pollution prevention is no longer just about having a valve in place. It is about ensuring the entire system can respond under real-world conditions.
Key considerations include:
- How quickly drainage can be isolated during an incident
- Whether containment depends on human intervention
- How systems perform during power failure
- Integration with environmental monitoring and alarms
- Long-term reliability and ease of maintenance
Modern containment solutions are designed to address these challenges — combining mechanical reliability with automated response.
In many cases, they can also be retrofitted into existing drainage systems, allowing sites to upgrade protection without major infrastructure changes.
A Critical Layer of Risk Management
Embedding effective containment into site infrastructure provides tangible benefits:
- Prevents contaminants reaching watercourses
- Supports compliance with environmental regulations
- Reduces clean-up costs and long-term liability
- Protects ecosystems and surrounding communities
- Strengthens stakeholder and regulatory confidence
For many organisations, it also helps avoid incidents escalating into reportable environmental events — a growing concern in an era of increased scrutiny.
Looking Ahead: From Awareness to Action
PFAS contamination is unlikely to fade from the headlines.
As monitoring improves and regulatory frameworks tighten, industrial operators will be expected to demonstrate not just awareness — but robust, reliable systems capable of preventing environmental harm.
The challenge is not simply avoiding incidents. It is ensuring that when they occur, their impact is contained effectively and immediately.
Reviewing Your PFAS Risk Exposure
With PFAS now firmly in focus, many operators are reassessing whether their current containment systems would perform under real-world conditions.
Key questions include:
- How quickly can your drainage system be isolated?
- Does your containment strategy rely on manual intervention?
- What happens to contaminated runoff during and after an incident?
At Sandfield Penstock Solutions, we work with engineers, consultants, and site operators to assess these risks and develop practical containment strategies aligned with current guidance and best practice.
If you are reviewing your pollution prevention approach, it may be worth exploring whether your existing systems provide the level of protection now expected — and whether improvements could strengthen both compliance and resilience.
Reference
The Guardian – PFAS contamination investigation
Environment Agency – Surface water monitoring data
