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Water scarcity is the most significant challenge facing semi-arid and arid areas because fresh water is often transferred from other areas to these regions, and then discharged as wastewater. Irrigating agricultural lands and green spaces with treated wastewater (TWW) can be thus regarded as a way to reduce pressure on fresh water resources and lead to the utilization of ecosystem services, such as regulating and cultural ones. The most important factor affecting the expansion and sustainability of these areas is people's participation. Therefore, this study reflected on the weight of locals' willingness and attitudes as one of the most effective factors in the development of irrigation with TWW in peri-urban areas and ecological buffer zones. The main indicators were accordingly extracted from previous research and examined through a survey questionnaire, and then analyzed by structural equation modeling (SEM) in the AMOS and LISREL software packages. The indicators were related to individuals' health in product consumption (health), people's activities in farmlands and green spaces (assurance), and users' distance from farmlands (accessibility). The study results revealed that accessibility was the most important factor, and then health and assurance were effective in people's participation in agricultural activities in farmlands irrigated with TWW in peri-urban areas and increasing green-space buffer zones.

water supply

People's participation in using treated wastewater as an approach for sustainability of ecosystem services, green spaces, and farmlands in peri-urban areas: the case study of Kalak-e Bala, Karaj, Iran