A previous study mentioned that students' action responses towards water pollution are incongruent with the training they received in schools. Conducting a course of two weeks with elementary students (N = 22) aged 9-10 in Hong Kong, the study aims to connect primary students' perceptions of the causes, consequences and responsive actions on water pollution with the local context, using photovoice. Analysing the data with concept mapping the results identified domestic sewage, trade effluent and industrial sewage as the causes and destroying the ecosystem, reducing food supply, degrading scenery and degrading human health and well-being as the consequences.