Overall, the key drivers were similar for the disinfection of groundwater and surface water (Figure and Figure ). The discount rate was found to have noticeable influence the cost of all four of the technologies. For POU chlorination, the assumptions that influenced cost were the dose of NaClO and the chlorination container cost (Figure ). This outcome is expected since NaClO is the primary consumable in this technology, and the container is the only capital requirement. In the case of AgNP CWF, the key drivers were labor cost, bucket cost, and spout cost. For water type 2, with AgNP CWF, the key drivers were AgNP loading rate, labor cost, discount rate, bucket cost, and lid cost.