EU ZLD Rule Requires EN 16750 Pre-Review

The European Commission officially released an amendment draft to the Industrial Water Reuse and Zero Liquid Discharge Demonstration Regulation on 31 May 2026, with the relevant requirement set to take effect on 1 October 2026. The rule makes EN 16750:2025 mandatory type inspection and third-party pre-review a key compliance condition for ion exchange modules used in heavy metal and ammonia nitrogen deep removal within ZLD systems entering the EU market. Chemical, electroplating, pharmaceutical and other high-compliance supply chains should pay close attention because uncertified products may face customs clearance refusal and may directly affect CE conformity declaration responsibilities for importers.

Event Overview

According to the publicly available information, the European Commission published the amendment draft to the Industrial Water Reuse and Zero Liquid Discharge Demonstration Regulation on 31 May 2026.

The draft specifies that from 1 October 2026, all ZLD systems entering the EU market that include ion exchange modules for deep removal of heavy metals or ammonia nitrogen must pass mandatory type inspection under EN 16750:2025 and third-party pre-review.

The requirement is directly linked to the importer’s responsibility for the CE declaration of conformity. Products that have not obtained the required certification may be refused customs clearance. The disclosed scope covers supply chains in compliance-sensitive sectors such as chemicals, electroplating and pharmaceuticals.

Which Segments May Be Affected

Importers and Direct Trade Companies

Importers are directly affected because the new requirement is connected to their CE conformity declaration responsibility. If a ZLD system contains an ion exchange module used for heavy metal or ammonia nitrogen deep removal, importers will need to verify whether the module has passed EN 16750:2025 mandatory type inspection and third-party pre-review before entering the EU market.

The main impact may appear in customs clearance preparation, product documentation review and supplier compliance confirmation. Analysis shows that importers relying on incomplete technical files or uncertified modules may face higher clearance uncertainty after the effective date.

ZLD System Manufacturers and Integrators

ZLD system manufacturers and integrators may be affected when their systems include ion exchange modules within the scope of the new requirement. The regulation does not only concern the complete ZLD system as a whole; it specifically identifies ion exchange modules involved in heavy metal and ammonia nitrogen deep removal.

From an industry perspective, manufacturers and integrators should pay attention to module-level compliance evidence, third-party pre-review status and the alignment between product configuration and EU market entry requirements. The impact is likely to be reflected in product design review, certification scheduling and export documentation coordination.

Chemical Industry Supply Chains

The chemical sector is named among the compliance-sensitive industries covered by the new rule. Companies in this segment may use or procure ZLD systems where deep removal of heavy metals or ammonia nitrogen is part of the treatment process.

The impact mainly concerns procurement screening and supplier qualification. Current focus should be placed on whether purchased ZLD equipment for the EU market contains ion exchange modules subject to EN 16750:2025 pre-review, and whether the supplier can provide corresponding certification evidence.

Electroplating Industry Supply Chains

Electroplating is also identified as a covered high-compliance sector. Because the rule specifically refers to heavy metal deep removal, ZLD systems serving this segment may require closer technical and compliance review.

Observably, the impact may be concentrated in equipment selection, module replacement and documentation consistency. Enterprises involved in electroplating-related supply chains should avoid treating ZLD system compliance as a general equipment issue only, because the new requirement targets a specific module and removal function.

Pharmaceutical Industry Supply Chains

The pharmaceutical sector is included in the disclosed scope of affected supply chains. For pharmaceutical companies or suppliers preparing ZLD systems for the EU market, the requirement may influence equipment acceptance, import preparation and compliance communication with vendors.

Analysis shows that the pharmaceutical supply chain may need to strengthen early-stage confirmation of whether ammonia nitrogen deep removal involves ion exchange modules covered by the rule. The key issue is not only whether the overall system can operate, but whether the relevant module has passed the required EN 16750:2025 process.

Supply Chain Service Providers and Compliance Support Parties

Supply chain service providers, customs-related service parties and compliance support teams may also be affected because uncertified products may be refused customs clearance. Their role will become more dependent on accurate product classification, certification document checks and communication between manufacturers, importers and third-party review bodies.

From an industry perspective, service providers should pay attention to the distinction between general ZLD equipment documents and the specific pre-review requirement for ion exchange modules used in heavy metal or ammonia nitrogen deep removal.

Key Points to Watch and Practical Responses

Track Official Wording and Implementation Details

Companies should continue to monitor official EU communications related to the amendment draft and the implementation of the requirement from 1 October 2026. Current focus should be on how EN 16750:2025 mandatory type inspection and third-party pre-review will be applied in practice, especially for imported ZLD systems containing covered ion exchange modules.

This monitoring should be linked to concrete business processes, including purchase orders, shipment schedules, technical documentation and customs clearance preparation for the EU market.

Identify Whether Existing Products Fall Within the Covered Scope

Enterprises should first determine whether their ZLD systems entering the EU market include ion exchange modules used for heavy metal or ammonia nitrogen deep removal. If the module is not clearly mapped within technical documents, the importer or buyer may face difficulty proving compliance.

Analysis shows that scope identification is the first practical step because the requirement is tied to a specific module and removal function, rather than to all industrial water treatment equipment in general.

Review Certification Evidence Before EU Shipments

For products planned for EU entry after 1 October 2026, companies should check whether the relevant ion exchange modules have completed EN 16750:2025 mandatory type inspection and third-party pre-review. Importers should also align these materials with their CE conformity declaration responsibilities.

Practical preparation may include requesting certification documents from suppliers, checking whether the documents correspond to the actual module used in the ZLD system, and confirming whether the reviewed configuration matches the product to be shipped.

Prepare Procurement and Supplier Communication Plans

Companies purchasing ZLD systems for chemical, electroplating or pharmaceutical applications should include the new requirement in supplier communication. Procurement teams may need to ask whether the proposed system contains covered ion exchange modules and whether certification can be provided before shipment.

From an industry perspective, early communication is more practical than waiting until customs clearance, because uncertified products may be refused entry and could disrupt project schedules or supply chain arrangements.

Editor’s View / Industry Observation

Analysis shows that this update should be understood as a compliance threshold for ZLD systems entering the EU market when they contain ion exchange modules for heavy metal or ammonia nitrogen deep removal. It is not merely a general policy signal, because the disclosed information already links the requirement to a specific effective date, a specific standard and customs clearance consequences.

At the same time, it is more appropriate to view the current stage as a period requiring close implementation tracking. The amendment draft has been officially released, and the effective date has been identified, but companies still need to follow any further official clarification related to review procedures, documentation expectations and market entry enforcement.

Current focus should be placed on the interface between technical configuration and compliance documentation. For affected industries, the key risk is not only whether ZLD systems are needed, but whether the ion exchange module inside the system can meet the EN 16750:2025 pre-review requirement before EU import.

Conclusion

The EU’s upcoming ZLD requirement adds a clear compliance checkpoint for ion exchange modules used in heavy metal and ammonia nitrogen deep removal. Its industry significance lies in the direct connection between module certification, CE conformity declaration responsibility and customs clearance for the EU market.

From an industry perspective, the information is best understood as an enforceable compliance development that still requires ongoing observation of implementation details. Companies in chemical, electroplating, pharmaceutical and related supply chains should respond by identifying covered modules, reviewing certification status and aligning suppliers, importers and compliance teams before the 1 October 2026 effective date.

Information Source Statement

Main source: European Commission, amendment draft to the Industrial Water Reuse and Zero Liquid Discharge Demonstration Regulation, officially published on 31 May 2026.

Items for continued observation: subsequent official explanations, implementation procedures for EN 16750:2025 mandatory type inspection and third-party pre-review, and customs clearance enforcement details for affected ZLD systems entering the EU market.