The Implementation Guideline: Economic Cost‑Benefit Analysis (CBA) of Project Environmental Impacts and Mitigation Measures for Waste Water Treatment Projects (WWTPs) provides a structured approach for evaluating the economic implications of environmental impacts and mitigation measures associated with wastewater treatment projects. The guideline explains how to identify, quantify, and value environmental costs and benefits arising from project implementation, including improvements in water quality, public health outcomes, ecosystem protection, and reductions in pollution. It outlines procedures for incorporating mitigation measures into project design and assessing their economic efficiency. The methodology integrates environmental valuation techniques with standard cost-benefit analysis to ensure that both market and non-market impacts are considered. Key economic indicators such as Net Present Value (NPV) and Benefit-Cost Ratio (BCR) are used to determine whether environmental mitigation measures deliver net societal benefits. Overall, the guideline supports decision-makers in selecting wastewater treatment investments that balance environmental protection, economic efficiency, and long-term sustainability.
