MFDS Tightens ZLD Certification TOC Testing Rule

On June 23, 2026, South Korea’s Ministry of Food and Drug Safety (MFDS) updated its implementation rules for Zero Liquid Discharge (ZLD) system certification, requiring TOC traceability testing for wastewater reuse equipment submitted for certification to be issued by KOLAS-authorized laboratories. The change matters most to exporters, equipment manufacturers, certification teams, and supply chain coordinators involved in ZLD-related wastewater reuse systems, because it directly affects document acceptance and extends the average certification timeline by 21 days.

What the revised MFDS rule now requires

According to the information provided, the revised MFDS rules apply to wastewater reuse equipment seeking ZLD certification, including TOC removal modules and concentrated brine crystallization units. Under the updated requirement, TOC concentration traceability reports must be issued by laboratories authorized by KOLAS, the Korea Laboratory Accreditation Scheme.

The same information also states that third-party testing reports previously used by Chinese exporters are no longer accepted for this certification process. As a result, the average certification period is extended by 21 days.

Where the pressure is likely to appear first

Export-facing equipment suppliers

From an industry perspective, exporters shipping wastewater reuse equipment to the Korean market may be affected first because previously prepared third-party test reports can no longer be used for the relevant ZLD certification submission. The immediate pressure point is documentation readiness, especially where shipment planning depends on certification timing.

Manufacturers of key ZLD modules

Manufacturers of TOC removal modules and concentrated brine crystallization units may feel the impact at the product qualification stage. Analysis shows that the rule change matters not only for final system submission, but also for how supporting test evidence is prepared before market entry discussions or contract execution.

Certification and compliance teams

Teams responsible for regulatory submissions may need to adjust internal timelines and document review procedures. What deserves closer attention is the shift in report acceptability: the issue is not only whether TOC data exists, but whether the traceability report comes from a KOLAS-authorized laboratory.

Supply chain and customer coordination roles

For supply chain service providers and customer-facing project managers, the practical impact is likely to show up in delivery scheduling and expectation management. Observably, an average 21-day extension in certification time can affect handover plans, contract milestones, and communication with Korean buyers or partners.

What companies should monitor now

Check report eligibility before submission planning

Companies involved in Korean ZLD certification should review whether existing TOC traceability reports meet the new acceptance condition. The key operational issue is no longer only technical testing completion, but whether the issuing laboratory holds KOLAS authorization for the relevant purpose.

Rework delivery and certification timelines

Because the provided information indicates an average 21-day extension, businesses should closely review submission schedules, production planning, and customer commitments linked to certification completion. This is especially relevant where market entry or project delivery depends on synchronized regulatory approval.

Clarify document expectations with partners

What deserves closer attention is the difference between having a technically valid report and having a report that is acceptable under the revised MFDS process. Exporters, manufacturers, and service partners may need earlier alignment on required test documentation to reduce avoidable delays.

Watch for further official clarification

Analysis shows that this update creates an immediate compliance requirement, but companies should continue monitoring whether additional official wording, procedural guidance, or implementation detail emerges around document review and submission practice.

Why this looks like more than a paperwork adjustment

This section is an observation rather than a statement of fact. Observably, the update is not only about adding a test item; it changes who is allowed to validate TOC traceability for ZLD certification purposes. That distinction matters because it can reshape certification preparation workflows for cross-border suppliers, especially those that previously relied on non-KOLAS third-party reports.

It is more appropriate to understand this as an operational compliance signal with immediate effects, rather than as a long-term market conclusion. The confirmed facts already show a change in accepted documentation and a longer certification cycle, while the broader market consequences still require continued observation.

How the market is likely to read this update

Based on the confirmed information, the most reasonable reading is that MFDS has introduced a more specific validation threshold for ZLD-related wastewater reuse equipment entering certification. For the industry, the significance lies less in headline interpretation and more in execution: report origin, submission sequencing, and timeline control now appear more important than before.

At this stage, it is more appropriate to understand the development as a concrete short-term compliance change with possible longer-term implications that still need to be watched, rather than as a fully settled shift in market structure.

Basis of this article and what still needs verification

This article is based on the user-provided news title, event date, and event summary concerning the June 23, 2026 MFDS update to ZLD certification implementation rules. For developments of this kind, relevant source types typically include official regulatory notices, company announcements, industry association updates, authoritative media reporting, and standards-related documents.

A specific official source link was not provided in the input, so the exact source document should continue to be verified. Further follow-up should focus on whether MFDS or related institutions publish additional implementation details, interpretive guidance, or process clarification tied to KOLAS-authorized laboratory reporting.