Sustainability Issue Assessment

• 1 Value Chain Analysis

The Company conducts a comprehensive analysis of business activities across its entire value chain, encompassing both primary and supporting activities. This analysis is undertaken to obtain relevant information for assessing impacts on all stakeholder groups, ensuring coverage of all activities throughout the Company’s value chain. The stakeholders considered within this value chain include employees, shareholders and investors, customers, business partners, suppliers and contractors, communities and society, as well as environmental authorities.

• 2 Stakeholder Impact Analysis

The Company assesses the impacts of its business operations in relation to each stakeholder group across environmental, social, and governance (ESG) dimensions. These impacts are closely linked to human rights considerations associated with each aspect. To ensure a comprehensive understanding, the Company conducts stakeholder interviews to identify key impact issues as well as related concerns. In addition, relevant issues are compiled from both internal and external sources, including specialized departments and subject-matter experts. This process encompasses both positive and negative impacts, covering short-term and long-term perspectives. The identified impacts represent those that have the potential to affect each stakeholder group.

• 3 Identifying Sustainability Issues Pertinent to the Company’s Business Operation

The identification of sustainability issues relevant to the Company’s business operations serves to establish a structured framework for the consideration of material sustainability topics. This framework encompasses a comprehensive range of factors, including both internal and external influences, the Company’s operational activities and business model, as well as key issues of interest within the water supply industry. Furthermore, the Company takes into account global sustainability trends by referencing leading organizations and internationally recognized sustainability frameworks and standards. These include the Global Reporting Initiative (GRI) Standards, the Stock Exchange of Thailand’s ESG Rating (SET ESG Rating), S&P Global’s ESG Indices, the United Nations Sustainable Development Goals (SDGs), and the United Nations Global Compact (UNGC).

• 4 Assessment and Prioritization of Sustainability Issues

The Company organizes workshops involving executives and employee representatives to analyze and assess the impacts of various sustainability issues on stakeholders, incorporating insights derived from Steps 2 and 3. In addition to evaluating the magnitude of impacts and the likelihood of both positive and negative outcomes, the process also considers linkages to human rights issues. Furthermore, due consideration is given to the severity of impacts across each dimension. This comprehensive approach enables the Company to effectively identify and classify material sustainability topics,as well as fundamental business topics essential to the Company’s operations (Business Fundamental Topics).

• 5 Reporting, Review, and Continuous Improvement

The Company has established plans and operational guidelines to mitigate the negative impacts of both sustainability issues and fundamental business topics. In the initial sustainability assessment process, the findings are submitted to the Company’s executive management and Sustainability Committee for review and approval of disclosure. The Company ensures a continuous review of the process for identifying sustainability issues and consistently discloses relevant information in its Sustainability Development Report. This ongoing approach enables the Company to evaluate impacts and implement appropriate management measures in response to changing environmental, social, and economic conditions each year.