Starting September 1, 2026, a batch of new water environment standards — including the Technical Guideline for the Formulation of Water Pollutant Discharge Standards for Centralized Wastewater Treatment Facilities in Industrial Parks (HJ 945.4—2026) — enter their implementation window. Industrial park wastewater management formally bids farewell to the "one-size-fits-all" approach and shifts to differentiated "one park, one policy" control, as the regulatory logic moves from "after-the-fact firefighting" to "ex-ante prevention".

On September 1, 2026, a batch of new water environment standards will enter their implementation window: the Technical Guideline for the Formulation of Water Pollutant Discharge Standards for Centralized Wastewater Treatment Facilities in Industrial Parks (HJ 945.4—2026) and the revised Discharge Standard of Water Pollutants for the Textile Industry (GB 4287—2026), among other policy documents, will officially take effect. At the same time, the Ministry of Ecology and Environment has released policy interpretations on industrial wastewater pollution risk prevention, setting higher requirements for industrial enterprises, centralized treatment facilities in parks, characteristic pollutant control, self-monitoring, and coordinated risk prevention and control. This series of intensive moves shows that industrial wastewater treatment is undergoing a profound transformation from concept to practice.

A Shift in Regulatory Logic: From "After-the-Fact Firefighting" to "Ex-Ante Prevention"

The policy sends an unmistakable industry signal — industrial wastewater treatment is fundamentally changing its past approach.

Previously, many industrial enterprises followed an environmental model of "exceeding limits → being inspected → urgently calling in environmental companies for rescue", a form of after-the-fact remediation: only after problems arose did they invest funds and manpower in rectification, which was not only costly but also exposed them to penalties and production restrictions. Under the new rules, the regulatory gate has moved fully upstream, and the correct model for enterprises has become: advance inspection → identify potential risks → implement pre-rectification → retain complete operating records. The value node of environmental services has correspondingly shifted from "firefighting after an incident" upstream to "ex-ante risk screening".

For producers inside parks, waiting until environmental inspectors arrive before remedying will become increasingly costly. Proactively conducting a "pre-compliance check" on incoming wastewater is like giving the wastewater station a comprehensive "advance physical examination", and is becoming the most valuable environmental investment today.

"One Park, One Policy": Farewell to "One Size Fits All"

Another profound change brought by the new guideline is the transformation of discharge control for industrial parks.

Under the technical requirements of HJ 945.4—2026, localities will "tailor" water pollutant discharge standards for industrial parks based on the park's industrial structure, pollution discharge characteristics, and water environment carrying capacity. Industrial parks will bid farewell to the crude "one-size-fits-all" control and shift to differentiated "one park, one policy" management. For parks whose characteristic pollutant discharges may affect downstream sensitive targets, control requirements will be stricter and more precise.

The pressure to upgrade existing facilities follows. Industry analysis points out that a large number of aging wastewater treatment plants built a decade ago and capable only of treating conventional COD and ammonia nitrogen must add advanced treatment units targeting characteristic pollutants. Combined with the deployment on facility upgrading in the eight-department Notice on Further Strengthening Industrial and Other Wastewater Pollution Risk Prevention and Safeguarding Agricultural Irrigation Water Safety, centralized wastewater treatment facilities in industrial parks are ushering in a systematic round of standard-upgrade opportunities.

Wastewater Station "Pre-Compliance Check": Five Key Areas to Examine

Combined with the key points of the new regulations, a complete pre-compliance check of incoming wastewater covers five core modules:

• Water quality risk screening — test and assess the enterprise's production wastewater, focusing on COD, ammonia nitrogen, total nitrogen, salinity, heavy metals, and industry-specific characteristic pollutants, to establish the true baseline of the wastewater and identify potential exceedance factors. Many enterprises only look at effluent indicators and ignore influent fluctuations and toxic inhibitory substances, which can easily cause the biological system to collapse later.
• Pretreatment capacity verification — conduct on-site evaluation of the enterprise's existing physical-chemical and pretreatment units to determine whether the facilities can handle actual incoming production water. Many plants have complete hardware, but their treatment capacity does not match the actual wastewater, making them a high-risk hidden point for discharge-standard violations.
• Biological system health diagnosis — biological treatment is the core of wastewater treatment, requiring focused testing of sludge activity, nitrification capacity, settling performance, and the system's shock resistance. Well-equipped facilities with aging sludge, bulking, or nitrification failure that result in substandard operational performance likewise constitute compliance risks under the new rules.
• Discharge control and self-monitoring compliance assessment — check discharge outlet standardization, monitoring indicator coverage, data record completeness, and networked reporting requirements against the new standards, consolidating the enterprise's primary responsibility for self-monitoring.
• Environmental risk joint prevention and control mechanisms — in line with the policy interpretation, improve characteristic pollutant control ledgers, risk early warning, and joint prevention and control agreements with the park's centralized treatment facilities, ensuring that emergency coordination under abnormal operating conditions is well founded.

Restructuring the Existing Market: Compliance Capability Becomes the Core Competitive Edge

Under the new rules, the value landscape across the industry chain is being rewritten.

For park managers, compliance is the "green calling card" for investment attraction — against the backdrop of increasingly widespread dual-carbon and ESG principles, parks with high-standard environmental infrastructure are more likely to attract high-end manufacturing. At the same time, the new rules encourage reclaimed water recycling; when treated effluent is used for industrial water and other scenarios, the industrial water price is typically two to three times the wastewater treatment fee, opening up a path for operators with advanced treatment capability to upgrade their business model from "treatment fees" to "water fees".

For environmental service providers, "one park, one policy" means every park needs a customized operating plan — capabilities in process diagnosis, influent characteristic analysis, and comprehensive toxicity control will translate directly into market premium. For polluting enterprises, proactive compliance is far more economical than passive rectification, and reducing characteristic pollutant generation at the source is the surest strategy for navigating the new regulatory cycle.

The September 1 test is imminent. Whoever first masters the technical capability for precise pollution control and systematic operating experience will seize the initiative in the reshuffling of the existing market.

TIANYI TECH Co., Ltd. has long focused on R&D and engineering practice in wastewater treatment and water reuse, and will continue to follow the implementation of the new standards, providing industrial parks and polluting enterprises with full-process technical support from water quality diagnosis and pre-compliance assessment to advanced treatment retrofits.

(This article is compiled from publicly released policy documents by the Ministry of Ecology and Environment and public industry information.)