IRPC is committed to responsible and sustainable water management to ensure efficient use,
maintain water quality, and support long-term water security for operations and surrounding communities
Water is a critical resource not only for IRPC’s operations but also for surrounding communities and therefore requires careful and responsible management. IRPC recognizes that water use and discharge may impact the environment and people, particularly in relation to water availability, water quality, and access to shared resources, while effective water management supports resource efficiency, environmental protection, and community well-being. Given the shared nature of water resources, IRPC’s operations are closely linked to these impacts through water use and discharge, as well as participation in shared water systems. The Company therefore emphasizes responsible water management and collaboration with relevant stakeholders to support balanced and sustainable water use while minimizing potential adverse impacts.
IRPC manages water resources through an integrated approach that combines operational control, risk assessment, and stakeholder collaboration to support responsible water use and fair allocation of shared water resources. The Company works with government agencies, PTT Group companies, and local stakeholders, including through water user committees, to help address water-related challenges and mitigate risks associated with water scarcity.
To support long-term water security, IRPC conducts regular water-related risk assessments covering both physical and regulatory aspects. The results are used to inform water management planning, demand forecasting, and mitigation measures, supporting efficient water use and a reliable water supply for ongoing operations.
Implementation is guided by the Sustainable Water Management Framework, which is applied across all IRPC operational sites, covering 100% of operations, and supply chain. The framework is operationalized through the 321RPSD water management strategy, comprising: 3Rs – Reduce, Reuse, and Recycle water consumption; 2R – Reserve and Responsibility for water resources; 1P – Public Participation in water resource management; and SD – Supply and Demand management to support business continuity and prevent community conflict.
Water–related Risk Assessment
IRPC conducts comprehensive water-related risk assessments covering both physical and regulatory risks. The assessment is supported by the Aqueduct 4.0 Water Risk Atlas developed by the World Resources Institute (WRI), which covers 100% of IRPC’s operational locations and is used to evaluate water-related risk exposure and inform water management planning.
The assessment covers physical risks, including water availability and water quality, as well as regulatory risks related to requirements governing water use and discharge. The results support demand forecasting, mitigation planning, and ongoing monitoring of water risk exposure across operations. Water availability is considered in relation to operational needs, while water quality is assessed in relation to operational requirements and compliance with discharge standards. In addition, water-related risks are considered in the context of shared water resources, including potential competing demand and consideration of surrounding communities.
The 2025 assessment results indicate that most locations are classified within medium–high water stress levels, with one location identified as high water stress.
Low to Medium
0
0
Medium–High
4
31
High
1
1
Extremely High
0
0
For facilities located in water-stressed areas, IRPC establishes targets to improve water use efficiency and manage water demand, including:
Water–related Risk Management Strategy
IRPC uses water from natural sources supplied by the Rayong Irrigation Department to support its production processes. The water is treated to meet required quality standards before being used in key operational systems, including cooling systems, demineralized water production, and flue gas desulfurization (FGD). To manage operational risks related to water quality and system performance, IRPC monitors and controls water quality prior to use and discharge, in accordance with standards established by the Department of Industrial Works and other relevant authorities.
In addition, IRPC applies the 3Rs principle—Reduce, Reuse, and Recycle—to support efficient water use within its operations. This includes reducing water consumption at source, reusing treated effluent where applicable, and recycling water for suitable applications within the production process.
Recognizing that water is a shared resource, IRPC manages water use with consideration for surrounding communities and potential competing demand. IRPC engages with government agencies, the PTT Group, and local water management platforms to monitor water conditions and coordinate response measures, particularly in areas with higher water stress levels. This includes collaboration on water conservation during drought periods, water allocation planning, and mitigation measures such as water distribution and flood prevention. IRPC also participates in regional platforms, including the Eastern Water War Room and the PTT Group Water Management Team (PTTWT), to support coordinated water management.
IRPC is committed to improving water use efficiency and reducing water losses, including leakage, across our operations. Building on this commitment, IRPC adopts the 3Rs principle: Reduce, Reuse, and Recycle. This involves minimizing water consumption at the source, reusing, and recycling treated effluent that meets quality standards for reuse in other applications, such as plant irrigation or substituting distilled water with treated water for preparing chemical solutions. This approach is applied across IRPC’s operations to improve water use efficiency and reduce overall water consumption.
To enhance efficiency, IRPC has integrated digital tools, including the i-utility application, to enable real-time monitoring of water usage and improve awareness. The system also supports the identification and reduction of water losses and potential leakage within internal water distribution systems.
In addition, IRPC promotes a culture of water conservation among employees through campaigns that encourage responsible water use both at work and at home. IRPC also collaborates with machine cleaning contractors during major scheduled maintenance to assess water consumption in cleaning processes, enabling better control and optimization of water use.
Water Distribution System (WDS) Optimization
In 2025, IRPC focused on reducing water discharge in the Water Distribution System (WDS) at lab line 07X068B at CCM Plant. The department’s policy aims to reduce Demineral Water(WDS water) usage, supporting the Company’s overall goal of lowering utility costs. The project successfully minimized water loss and leakage in the cooling system(Close loop cooling bath) by 78.03 m³ per year, meeting the set target. The achieved intensity is 0.0034 m³ per ton of product, demonstrating effective water management and resource optimization.
Reduced Steam Consumption at Polynaphtha Unit
In 2025, IRPC implemented a 3Rs initiative at the PNU unit of the UHV plant under the project “Reduced Steam Consumption at Polynaphtha Unit.” The project reduced water consumption at the PNU unit by 38,768 m3, representing a 27.29% reduction in water use. In addition, the project received the Silver Award at the PTT Group Water Excellence Contest 2025.
IRPC manages wastewater to ensure environmental compliance while supporting operational efficiency. Wastewater is monitored based on effluent quality parameters established for the industrial zone, including Online COD monitoring at Receiving Pond 1, with results reported to the Department of Industrial Works’ monitoring system in accordance with regulatory requirements.
The Company operates two wastewater treatment plants within the IRPC Industrial Zone in Rayong Province, supported by a pipeline network covering all factories in the industrial zone to enable centralized and controlled treatment. Wastewater quality is checked against internal standards prior to entering the treatment system, helping to support effective treatment at source and reduce the risk of non-compliance. IRPC also conducts assessments of receiving water bodies associated with operations to avoid potential impacts on the surrounding ecosystem.
During major scheduled maintenance, wastewater is managed according to defined disposal methods. Wastewater that cannot be treated within IRPC’s system is handled by licensed disposal contractors to prevent improper discharge and minimize potential impacts on surrounding communities.
To support effective wastewater management and strengthen stakeholder confidence, IRPC engages third-party consultants and government agencies to regularly collect and analyze wastewater samples, verifying that wastewater quality meets both internal standards and regulatory requirements prescribed by the Ministry of Industry.
