New monitoring parameters, updated procedures and a more structured approach to environmental data management. With the Wastewater & Sludge Guidelines V2 and Gateway 2.0, ZDHC introduces significant changes for brands and suppliers in the textile, leather and footwear sectors.
1 December 2026 marks an important milestone for the ZDHC Roadmap to Zero Programme, as the second version of the Wastewater & Sludge Guidelines comes into effect, introducing updated requirements for monitoring industrial wastewater and sludge.
These changes directly affect manufacturing facilities, while also having implications for brands managing environmental performance across their supply chains.
Wastewater & Sludge V2: What’s Changing?
The new version of the Guidelines expands the scope of monitoring and updates several technical and operational requirements.
The key changes include:
Wastewater: additional parameters to be monitored, updated analytical methods, reporting thresholds and certain compliance limits.
Sludge: expanded monitoring requirements covering additional groups of substances, with new analytical references.
Sampling: introduction of a semi-announced sampling approach to strengthen the verification process.
Scope of application: inclusion of raw wool scouring facilities.
These changes are complemented by clarifications published by ZDHC in July 2026, providing further guidance on interpreting analytical results and managing corrective actions where necessary.
The update is not simply about increasing the number of tests. It is about strengthening the connection between environmental monitoring, chemical management and continuous improvement in manufacturing processes.
Gateway 2.0 and ClearStream: Making Data Part of the Process
With Gateway 2.0, the ClearStream process introduces a more structured digital workflow for managing wastewater and sludge monitoring activities, from requesting testing services to sharing results.
For manufacturing facilities, this means greater integration between sampling, testing and reporting activities. For brands, it provides access to environmental information that is easier to consult and compare across their supply chains.
This evolution strengthens the role of data in assessing environmental performance and facilitating communication between brands and suppliers.
What Does This Mean for Brands and Suppliers?
As the 1 December 2026 deadline approaches, companies should review whether their existing monitoring programmes are aligned with the new requirements.
The impact of these updates may vary depending on manufacturing processes, facility characteristics and wastewater and sludge management practices.
For suppliers, the priority is to identify the applicable requirements and plan any necessary adjustments. For brands, it is essential to understand how these changes may affect supply chain monitoring programmes and sustainability objectives.
From Updated Guidelines to an Effective Monitoring Programme
As a ZDHC Approved Solution Provider, Analytical Group supports brands and manufacturing facilities in implementing ZDHC requirements through an integrated approach combining environmental testing, ClearStream services, technical consultancy and training.
We help companies assess the impact of these updates and define the necessary actions, with the aim of making environmental monitoring a practical tool for control, prevention and continuous improvement.
Is Your Company Ready for the ZDHC Wastewater & Sludge Guidelines V2?
Contact our experts to assess the impact of the new requirements and identify the most appropriate actions for your manufacturing facility or supply chain.