Integrating Wastewater Reuse (WWRU) into national Water Management Schemes (WMS) is crucial as Small Island Developing States (SIDS) attempt to cope with water resource constraints in a changing climate. In 2022, the Global Environment Facility Caribbean Regional Fund (GEF CReW+) on Wastewater Management, the Ministry of Public Utilities (MPU), Trinidad and Tobago and the Trinidad and Tobago Bureau of Standards (TTBS) spearheaded the development of a national voluntary standard for treated wastewater reuse focused on agricultural and landscaping uses. During the process, the MPU conducted a Knowledge, Attitudes and Practices (KAP) and Willingness to Pay (WTP) assessment to inform the standard and subsequent implementation. Results indicated `good' knowledge on wastewater and WWRU (59.3%), however attitudes and practices were considered `poor'. Inferential Statistics performed on numerically coded survey response data revealed no statistically significant relation with the demographic factors assessed; 84.1% of respondents were willing to use treated wastewater with health concerns identified as the main barrier; 27.3% of respondents were willing to pay the same price as conventional water, while 31.2% were willing to pay 25 -50% less. This assessment can inform the implementation and pricing process and provide valuable insights to increase the uptake of WWRU in the region.