Water impact assessment ensures new projects protect water quality
Impact assessments are now mandatory to evaluate how new projects or discharges affect surface and groundwater quality, especially under the EU Water Framework Directive.
Why impact assessments are needed
Following the landmark Wezer case, the EU enforces a strict ‘no deterioration’ principle for water bodies. Any new industrial project or permit must demonstrate that it will not worsen water quality or hinder progress toward a ‘good ecological status’. This puts the burden of proof on the project owner, requiring detailed, science-based analysis before approval.
The Flemish Implementation: The Wezer Test
In Flanders, this principle is formalised through the Wezer Test, a required component of the environmental permitting process. It obliges applicants to demonstrate that proposed discharges comply with all relevant quality standards and will not negatively impact the receiving water body.
The Wezer Test demands proof that your discharge:
- Does not degrade water quality beyond accepted thresholds
- Complies with Environmental Quality Standards (EQS) for all relevant substances
Water impact assessments ensure projects align with long-term ecological goals, preventing legacy pollution and enhancing planning integrity.