How prepared are EU drinking water firms for the revised drinking water directive?

With the new Drinking Water Directive gradually rolling out across the EU, Kara Sadler asks “Are we ready?”

Having worked in drinking water quality for over a decade, I have seen the role of monitoring and testing evolve significantly.

Early in my career, much of the focus was on demonstrating compliance, collecting samples, reporting results and meeting prescribed standards.

While that remains essential, it has become increasingly clear that the real value of monitoring lies in what the data tells us about risk, resilience and where problems may emerge next.

Whether in the laboratory, out in the field or working alongside operational teams, the professionals who measure and analyse water quality are often the first to see subtle changes within the water supply system.

Small shifts in trends, anomalies in results or early warning signals picked up through routine testing can make the difference between proactive intervention and reactive response.

The revised EU Drinking Water Directive (DWD) feels like a formal recognition of how good water quality management should already work.

For those who monitor, analyse and test water and wastewater, it is not simply a policy update. 

It’s a framework that will increasingly shape day to day practice. 

It will influence equipment choices and raise expectations around how data is used to inform decisions.

Water safety plans, the directive and DWI guidance

A central feature of the revised Drinking Water Directive is the requirement for a risk based approach to drinking water safety. 

This aligns with World Health Organisation Water Safety Plan (WSP) principles.

For many UK water companies, this is not new territory. 

Drinking Water Safety Plans (DWSPs) have been a regulatory expectation for some time, supported by guidance from the Drinking Water Inspectorate (DWI).

What feels particularly important from my perspective, is the increasing emphasis on consistency, clarity and demonstrable use of data within those plans.

DWI has already updated and refined its guidance on DWSPs. 

The guidance now reflects evolving best practice and aligns more closely with the intent of the revised directive.

While the directive sets the strategic expectation for risk based management, it is national regulation, such as that produced by DWI, that makes those expectations actionable.

How risks are described, how control measures are evidenced, and how monitoring data feeds back into risk assessment are all areas receiving greater scrutiny.

For professionals involved in monitoring and testing, this reinforces the importance of understanding how their data is used within the wider safety plan.

Results are not just outputs for compliance reporting. 

They’re inputs that inform risk scoring, price reviews and support assurance to regulators.

In practical terms, this places greater emphasis on trend analysis, early warning indicators and a clear understanding of what “normal” looks like within a drinking water supply system, not just whether a sample passes or fails.

Monitoring and testing: what changes on the ground?

From my own experience, this is where the directive becomes most tangible.

Monitoring programmes that once felt routine are now being revisited with fresh questions:

• Why are we measuring this?

• What does it tell us about risk?

• How quickly can we act on the results?

That shift in mindset – from sampling as an obligation to monitoring as intelligence – is one I see reflected across the sector.

The directive modernises monitoring requirements. 

It encourages risk based monitoring programmes tailored to local conditions, rather than fixed, prescriptive sampling alone.

For laboratories and field teams, this can mean both opportunities and challenges.

On the opportunity side, there is growing demand for online and continuous monitoring. 

As well as advanced analytical techniques for emerging contaminants, including PFAS, pharmaceuticals and endocrine disrupting compounds.

And equipment suppliers are responding with increasingly sophisticated solutions. 

These include online analysers by companies such as Hach, Endress+Hauser and ABB, to laboratory instruments including LC MS/MS platforms for trace level analysis.

In my experience, the real challenge is not whether these technologies exist, but whether monitoring strategies, skills and budgets are aligned. 

This would result in data generated genuinely informing operational and risk based decision making.

Article 11 and products in contact with drinking water

Materials and products in contact with drinking water are an area I have seen receive increasing attention in recent years.

Article 11 brings welcome clarity and consistency to this space. 

But it also formalises responsibilities that many water quality professionals already recognise as critical.

One of the most tangible changes for both utilities and testing professionals arises from Article 11 of the directive.

From 1 January 2027, delegated and implementing acts will introduce harmonised EU wide minimum hygiene requirements for materials and products in contact with drinking water.

Historically, materials approval has been fragmented. This resulted in different national schemes and testing requirements.

This has had direct implications for laboratories. They have needed to operate against varying standards depending on jurisdiction.

Under the new framework, harmonised positive lists, standardised testing approaches and clearer conformity assessment requirements will apply.

It also has practical implications for equipment selection. 

All components used during monitoring activities needing to comply with the same hygiene principles as permanent assets.

This may drive increased scrutiny of commonly used products.

As 2027 approaches and Article 11 requirements take effect, early engagement will be key.

Reviewing materials and equipment, understanding testing requirements and building capability now will help avoid last minute pressures later.

Skills, competence and consistency

As monitoring programmes become more sophisticated, the directive also implicitly raises expectations around competence.

Field technicians and laboratory analysts are increasingly required to understand not just how to take a sample or run an analysis, but why that data matters in a wider risk context.

There is renewed importance on training, method validation and quality assurance.

Accreditation to standards remains critical. But so too does the ability to interpret results, communicate uncertainty and support operational decision making.

Are we ready?

Preparedness across the EU is mixed.

Many drinking water firms and laboratories are already well aligned with the intent of the directive. 

Particularly where risk based approaches and advanced monitoring are established.

However, for some, there is still work to do in aligning equipment, skills and processes with the new expectations.

The revised directive provides emphasis on transparency and consumer information.

Results published to customers or regulators must be robust, defensible and well explained.

This increases the importance of data management systems, audit trails and consistent reporting formats. 

These are areas where laboratory information management systems (LIMS) and digital field data capture tools are becoming increasingly important.

For professionals involved in monitoring and analysing water, the revised Drinking Water Directive should be seen as a framework that elevates the value of their work.

High quality data, collected and interpreted well, sits at the heart of protecting public health.

A final reflection

Looking back, one of the biggest changes I have seen in water quality management is the growing recognition of the value of professional judgement.

Regulations and standards provide the framework. 

But it is the people collecting samples, validating results and questioning anomalies who give those frameworks meaning.

The revised Drinking Water Directive reinforces that role.

If it succeeds in encouraging us to use data not just to prove compliance, but to better understand and manage risk, then it will have delivered benefits far beyond regulatory alignment.