[Thailand] Water Pollution Control Act Enforcement Tightens: Industrial Wastewater Facilities to Be Fully Upgraded Before 2026, with Nitrogen, Phosphorus and Heavy Metals as the Treatment Focus

Overview

Thailand is using the newly strengthened enforcement of the Water Pollution Control Act to drive industrial enterprises to fully upgrade their wastewater treatment facilities before 2026, with a focus on reducing discharges of nitrogen, phosphorus and heavy metals while stepping up procurement of high-efficiency, low-energy treatment equipment. Analysts note that this policy-driven technological upgrade will reshape Thailand's environmental equipment competitive landscape over the coming years, accelerate the green transformation of manufacturing, and open a structural window for Chinese environmental equipment and technology suppliers to enter the Thai market.

Background: A Regulatory Upgrade from "Built" to "Strengthened"

Thailand's water pollution prevention and control has shifted from "facility construction" to "regulatory upgrade". As early as 1992, the Enhancement and Conservation of National Environmental Quality Act B.E. 2535 established the principle that pollution sources must install wastewater treatment systems; Section 70 requires pollution sources to build and operate wastewater treatment facilities, while Section 73 further requires treatment system operators to hold certification. Since then, the Ministry of Industry, the Industrial Estate Authority of Thailand (IEAT) and the Pollution Control Department (PCD) have respectively established factory-level and estate-level emission standard systems.

The core change in this round of stricter enforcement is that nitrogen, phosphorus and heavy metals have become the treatment focus. Traditional regulation has concentrated on conventional parameters such as BOD, COD and suspended solids, while the new enforcement direction explicitly targets eutrophication and toxic pollution sources: nitrogen and phosphorus discharges directly threaten the water quality of the Chao Phraya River basin and coastal waters, while heavy metals bear on food safety and ecosystem health. This shift in regulatory focus means that conventional "end-of-pipe compliance" processes no longer suffice, and advanced nitrogen and phosphorus removal as well as physicochemical heavy metal removal have become the gaps enterprises must fill.

Core: Three Upgrade Directions Driven by Policy

First, process upgrades. Biological treatment alone can no longer reliably meet standards, and enterprises need to add advanced treatment units to their existing processes — such as a "magnetic adsorption + membrane separation" combined process for heavy metals, anoxic/anaerobic intensification stages for total nitrogen, and chemical phosphorus removal with crystallization recovery for total phosphorus. A "magnetic adsorption + membrane separation" heavy metal removal technology developed by a domestic manufacturer has already obtained EU CE certification and has been piloted in Thailand's electronics manufacturing sector — a typical case of technology supply created by policy.

Second, equipment upgrades. The new policy explicitly encourages the procurement of high-efficiency, low-energy treatment equipment, and Thailand's Board of Investment (BOI) offers incentives such as an 8-year corporate income tax exemption for environmental machinery, further lowering the barrier for enterprises to replace inefficient equipment. For equipment manufacturers, energy efficiency indicators are becoming a key selling point for entering the Thai market.

Third, compliance capability upgrades. Stricter enforcement inevitably comes with more stringent acceptance, monitoring and penalties. Thailand's PCD enforces limits of BOD≤15 and COD≤100 mg/L for direct discharge into natural water bodies, and BOD≤20 and COD≤120 mg/L for centralized estate treatment; the IEAT laboratory conducts unannounced sampling, and violations may lead to suspension of discharge rights — compliance capability has become a hard constraint on business operations.

Significance: What It Means for Us

For TIANYI TECH, the market opportunities created by Thailand's stricter enforcement of the Water Pollution Control Act are clear and specific. First, retrofit demand for existing facilities — a large number of Thai-funded and Chinese-funded factories need to complete facility upgrades before 2026, creating a concentrated release of retrofit orders. Second, technological compliance advantage — our membrane process and complete equipment capabilities accumulated in water reuse and advanced treatment fit squarely with the "deep pollution removal + reuse" regulatory trend. Third, an equipment export channel — Thailand's PCD explicitly accepts imported equipment (subject to English operation manuals, ISO 9001 certification, factory acceptance test (FAT) certificates and performance guarantees), so Chinese equipment faces no identity barrier to entry; the key lies in complete document delivery and performance endorsement.

We plan to make Thailand a key Southeast Asian market: building on the Southeast Asian delivery experience accumulated in our Vietnam projects, we will cooperate with local Thai design institutes and EPC contractors to provide integrated "compliance retrofit + water reuse" solutions for high-pollution industries such as electronics, food processing, textile printing and dyeing, and electroplating, using BOI tax incentives as a cost lever when quoting to customers.

Industry Perspective: Our Assessment

From an industry trend standpoint, Thailand's enforcement upgrade is consistent with ASEAN's overall direction — Indonesia has issued its 2025–2030 water security roadmap, Vietnam is advancing its zero direct discharge plan for wastewater in key river basins, and Malaysia is accelerating pipe network renovation, making stricter regional regulation a certain direction. According to industry estimates, the Southeast Asian drainage and wastewater treatment market is expected to reach USD 21.84 billion in 2026, up 11% year-on-year, with the upgrade of wastewater treatment standards in Thailand's Eastern Economic Corridor (EEC) industrial estates being one of the three major growth engines. With tightening regulation and an expanding market, we are entering the best window to deepen our presence in Southeast Asia; whoever (including us) can first complete localized delivery capabilities and compliance system deployment will seize the initiative in the next round of regional competition.