## 4 Conclusions  
Water reclamation projects for the irrigation of plants and green areas with post-treatment consisting of sand filtration and chlorination in industrial parks were feasible regardless of the environmental benefits. Moreover, reclaimed water for irrigation could be given for free if environmental benefits are considered. However, in many cases, water reclamation projects for industrial water supply consisting of UF and RO, which were otherwise financially infeasible, became feasible when environmental benefits were considered. Comparing the two options, we observed that water reclamation for irrigation was substantially more cost-effective than the industrial water supply. As water reclamation projects often benefit the general public, the government should provide supportive measures to encourage their implementation and ensure their success. Nevertheless, the CBA in this study has certain limitations, as the environmental costs associated with using reclaimed water for irrigation to soil and groundwater if provided in excess were not considered. The entire benefits of water reclamation projects, including the environmental benefits of not releasing heavy metals, chemicals, or emerging pollutants, and socioeconomic and health benefits to communities and the general public, still require more investigation in the future.  
**Supplementary Materials:** The following supporting information can be downloaded at: [[https://www.mdpi.com/article/10.3390/w14071172/s1](https://www.mdpi.com/article/10.3390/w14071172/s1)]([https://www.mdpi.com/article/10.3390/w14071172/s1](https://www.mdpi.com/article/10.3390/w14071172/s1)), Table S1: Flow rates of wastewater to wastewater treatment plants in industrial parks in Chonburi and Rayong, which are among the most important industrial provinces in the Eastern Economic Corridor (EEC), Thailand. Table S2: Concentrations of pollutants in the wastewater treatment plant effluents of industrial estates in Chonburi, according to our 2018 survey. Table S3: Average concentrations of pollutants and their environmental damage costs. Table S4: Costs and benefits of different scenarios. Table S5: Net present values (NPVs), internal rates of return (IRRs), benefit-cost ratios (BCRs), and payback periods (PPs) for water reclamation projects for industrial water supply when including and excluding environmental benefits. Table S6: Costs and benefits in the net present values (NPVs) of water reclamation projects for industrial water supply. Table S7: Net present values (NPVs), internal rates of return (IRRs), benefit-cost ratios (BCRs), and payback periods (PPs) for water reclamation projects for irrigation of plants and green areas when including and excluding environmental benefits. Table S8: Costs and benefits in the net present values (NPVs) of water reclamation projects for irrigation of plants and green areas. Table S9: Actual amount of irrigation water in industrial parks in Chonburi in 2018. Table S10: Effective monthly rainfall in Chonburi. Table S11: Irrigation water demand of grass in Chonburi. Table S12: The irrigated green areas based on flow rate scenarios. Text S1: Calculation of irrigation water demand.  
Conceptualization, B.B.S. and P.S.; methodology, B.B.S., P.S. and J.S.; investigation, W.I.; data curation, W.I.; writing--original draft preparation, W.I., B.B.S. and J.S.; writing--review and editing, B.B.S., P.S., J.S., P.R. and T.L.; supervision, B.B.S. and P.S.; funding acquisition, B.B.S., P.R., J.S. and T.L. All authors have read and agreed to the published version of the manuscript.  
This research was funded by Thailand Science Research and Innovation (TSRI) under grant numbers SRI6230304, ORG6310016, and CU_FRB640001_01_21_6.  
Not applicable.  
The authors would like to express their gratitude to all of the industrial parks that provided the data for this study. We would also like to thank the Industrial Estate Authority of Thailand for their tremendous support.  
The authors declare no conflict of interest.