This informal CPD article, ‘Water Risk Screening Tools in Practice: Strengths, Limitations, and Appropriate Use’, was provided by Water Security Collective, a globally operating consultancy specialising in water risk assessment, strategy, and professional training.
Water risk screening tools have become a standard starting point for organisations seeking to understand their exposure to water-related risks. Among the most widely used are the WWF Water Risk Filter1 and WRI Aqueduct2 , both of which have played an important role in raising awareness of water risks within corporate decision-making.
Used correctly, these tools can provide valuable insights. Used incorrectly, however, they can lead to false confidence — and, in some cases, costly decisions.
This article explores what water risk screening tools are designed to do, where their limitations lie, and how organisations can use them properly as part of a more robust water risk assessment process.
What Water Risk Screening Tools Are Designed to Do
Water risk screening tools are primarily built for high-level comparison and prioritisation.
Their key strengths include:
- Providing a global overview of potential water-related risks
- Allowing organizations to do a high-level comparison of sites or regions at a portfolio level
- Highlighting possible hotspot locations that require further investigation
- Supporting early-stage discussions about water as a strategic risk
For organisations with large, geographically dispersed operations, these tools are often the first practical entry point into looking at water risks.
However, screening tools are not designed to replace in-depth assessments to assess a company’s actual water risk exposure and understand the level and type of water risks at each site. Their purpose is to flag potential issues, not to understand their root causes or predict site-specific outcomes.
Why Water Risk Is Particularly Difficult to Capture Through Screening Alone
Water risk differs fundamentally from many other environmental risks, such as GHG emissions. It is highly localised, deeply contextual and shaped by governance, behaviors and infrastructure as much as by hydrology.
While two sites may appear similar on a global map based on their risk scores from the screeing tools, the actual risks experienced on the ground can differ dramatically depending on infrastructure, governance, and management practices. This complexity places inherent limits on what global screening tools can reliably capture.
Key Limitations of Global Water Risk Screening Tools
Global Datasets and Local Accuracy
WWF Water Risk Filter1 and WRI Aqueduct2 rely on global or regional datasets. While necessary for global comparison, these datasets often lack the resolution required to reflect local realities.
Although users enter a precise site location into the tools, the underlying analysis is performed at a river basin or sub-basin scale, drawing on aggregated global or regional data. Basin-level insights are essential for understanding overall water resource risks, but they are not sufficient to capture how water risks actually materialise at a specific site.
Within the same sub-basin, water risk conditions can vary dramatically depending on local water demand, water pollution, infrastructure and access to WASH, land use and management. An operational site located in the centre of Dhaka, for example, faces very different water risks than a site in rural Bangladesh — despite both falling within the same sub-basin and receiving the same headline risk score from a screening tool.
Urban sites may experience acute competition for water, degraded water quality, failing infrastructure, and regulatory constraints, while rural sites may be exposed to entirely different challenges, such as seasonal scarcity or limited service coverage. When screening tools assign both sites the same risk category, these critical differences are obscured.
Missing Supply-Side Dynamics
Many screening tools focus heavily on indicators related to physical water stress – yet key supply-side factors remain insufficiently captured. These often include:
- Actual water storage capacity, such as dams and reservoirs
- Groundwater availability and depletion beyond modelled assumptions
- Environmental flow requirements
- Existence, condition and performance of water infrastructure
- Large-scale water imports, exports, or inter-basin transfers
- Seasonal differences between water availability and demand
These supply side factors, can significantly change the water stress experienced in a (sub-) basin, either turning a water secure basin into one facing significant water risks (e.g. when vast amounts of water is being exported to another basin) or reducing water risk exposure (e.g. water storage buffering dry season water stress).
Without accounting for these aspects, screening tools may present an incomplete — and sometimes misleading — picture of actual water stress.
Proxy Indicators and Indicator Scores
Where data gaps exist or it is not possible to have global indicators, such as on governance topics, screening tools rely on proxy indicators. For example, WRI measures regulatory and reputational risks by using WASH data (unimproved/ no access to drinking water / sanitation) and a Peak RepRisk country ESG risk indicator. While the intention is clear, this information alone does not allow for any conclusion on regulatory and reputational risks a site faces. This limitation is particularly relevant for water quality risks, regulatory risks, and reputational risks.
Further, to allow for easier interpretation and comparison across regions, only the score is published and not the underlying data. This leads to a loss of nuance. Overall scores make it difficult to understand which specific factors are driving risk, or how sensitive outcomes are to changes in individual variables. The also cannot be used for further analysis, for which in most cases all data is needed (e.g. water demand and supply data vs. a water stress score).
Global water risk scores
When Screening Tools Drive the Wrong Decisions
The risk of driving wrong decisions doesn’t arise not from the tools themselves, but from how they are used.
Consider a company screening potential sites for expansion. Based on global water risk scores, one location appears relatively low risk. The decision is made to proceed without further investigation.
Once operations begin, challenges emerge:
- Water supply is unreliable
- Groundwater levels are falling rapidly due to poor regulation
- Water pollution (utility and groundwater) increases operating costs
- Competing users place pressure on shared resources
- Community concerns escalate
Despite favourable screening results, water-related disruptions can often lead to operational delays, increased costs, and reputational exposure.
In a recent project, an in-depth water risk assessment was conducted for one of the company’s production sites in China, as the company was interested in expanding operations. The screening tools categorised the location as having medium water stress. However, when local supply and demand data were analysed, the situation appeared very different.
The city sourced its water from a sub-basin that was already severely water-stressed and unable to meet its own demand. To temporarily close the gap, water was being transferred from an upstream sub-basin. Yet projections showed that this upstream source would itself be unable to meet demand within a few years.
Government planning documents openly acknowledged that no long-term solution had yet been identified to secure water supply for this rapidly growing urban area beyond 2030 — despite some of the strictest water-efficiency and water-saving requirements we have encountered in practice.
Had the company proceeded based solely on screening results, it would have faced significant water-supply reliability risks in the near future, with limited options to mitigate risk once investments were made.
Screening tools can signal where to look, but they cannot determine whether a site is viable – or what water risk exposure it faces. Treating screening outputs as decision-ready insights can expose organisations to risks that only become visible when it is already too late to change course.
Why Organisations Rely So Heavily on Screening Tools
There are understandable reasons why many organisations depend primarily on screening tools:
- Limited internal expertise on water risk
- Pressure to produce rapid ESG assessments
- Budget and time constraints
- The assumption that water risk is synonymous with water stress
- The perceived authority of data-driven dashboards and maps
For many teams, screening tools offer a practical and accessible solution — especially when deeper assessments appear complicated or resource-intensive and guidance on how to approach a proper water risk assessment is missing.
Reliance on screening alone often reflects a capability gap, rather than a lack of intent to do it correctly.
Will Technological Advances Solve This in the Future?
Advances in satellite data, remote sensing, big data analytics, and artificial intelligence are rapidly improving the quality of water-related information available globally. Over time, these developments may enhance the ability of screening tools to reflect local conditions more accurately.
Yet even with improved data, certain dimensions of water risk remain difficult to capture remotely — particularly governance effectiveness, institutional capacity, infrastructure management, and informal water use.
Better data can improve the water risk screening, but it cannot (yet) fully replace contextual understanding.
What Screening Tools Cannot Replace: In-Depth Water Risk Assessment
Effective water risk assessment requires looking beyond water stress alone. In practice, water risks emerge from the interaction of three dimensions:
- Physical risks
Related to water stress, quality, and extreme events (floods/ droughts) - Infrastructure risks
Linked to storage, water treatment and distribution, wastewater collection and treatment, and overall system reliability - Governance risks
Shaped by laws and regulation, enforcement, institutional set up and coordination of stakeholders, capacity, finance, impact of corruption etc
Assessing these dimensions together allows organisations to understand not just where risks exist, but why they exist and how they may evolve.
Setting these water risks into context with the site realities is required to understand the site’s overall water risk exposure, e.g. if the site has a very low water demand, it’s risk exposure is lower than for a site with high demand in a water stressed area.
Same Water Stress, Different Outcomes: Singapore and Karachi
A useful illustration of these dynamics can be seen by comparing Singapore and Karachi. Based on the water risk tools, both locations show similar levels of water stress.
In practice, however, their water security outcomes differ substantially.
Singapore has invested heavily in infrastructure, diversified supply sources, long-term planning, and strong governance frameworks. This has helped Singapore be a relativeky water secure country, despite high levels of water stress.
Karachi, by contrast, faces challenges related to infrastructure performance, institutional coordination, and enforcement. Karachi faces huge water insecurity challenges, ranging from unreliable supply (far from 24/7 water supply) to high water pollution and disastrous floods.
The risk exposure doesn’t lie in water stress alone, but in how water systems are managed.
This distinction is critical for organisations seeking to understand real operational risk and site water risk exposure.
Using Screening Tools Correctly
When used correctly, water risk screening tools remain highly valuable. They are most effective when applied to:
- Identify potential hotspots
- Prioritise sites for deeper assessment
- Support internal conversations about water-related exposure
- Allocate resources for further investigation
They should not be used as standalone decision-making tools or as substitutes for in-depth water risk assessments.
Screening is a starting point — not an endpoint.
Closing Reflections
As water risks increasingly affect business continuity, supply chains, and investment decisions, organisations can no longer afford to rely on partial understanding.
While it can be more time and resource intensive at first to conduct an in-depth water risk assessment instead of just relying on water risk screening tools, it can prove to save time and resources in the medium and long term when costly investment decisions are at stake.
For professionals, this shift creates a growing need for capabilities that go beyond applying water risk screening tools and interpreting indices. Understanding how physical water risks interact with infrastructure performance and governance systems is becoming essential for informed decision-making.
Building this capability requires moving beyond screening tools alone and applying a holistic water risk assessment framework — across physical, infrastructure and governance risks - to assess water risks in context
We hope this article was helpful. For more information from Water Security Collective, please visit their CPD Member Directory page. Alternatively, you can go to the CPD Industry Hubs for more articles, courses and events relevant to your Continuing Professional Development requirements.
References:
1. WWF Water Risk Filter : https://riskfilter.org/water/home
2. WRI Aqueduct: https://www.wri.org/applications/aqueduct/water-risk-atlas/#/?advanced=false&basemap=hydro&indicator=w_awr_def_tot_cat&lat=-14.445396942837744&lng=-142.85354599620152&mapMode=view&month=1&opacity=0.5&ponderation=DEF&predefined=false&projection=absolute&scenario=optimistic&scope=baseline&timeScale=annual&year=baseline&zoom=2
