The Hannoogawa River in the western part of central Saijo town, Higashi-Hiroshima City, is a concrete-lined stream flowing north to south. To clarify its current environmental state and identify challenges for future environmental improvement, we surveyed the water quality, aquatic animals, and the local residents’ awareness of the stream. The biochemical oxygen demand of the stream water ranged between 1.1 and 3.7 mg L-1, indicating that the water was moderately polluted. However, several aquatic species that prefer oligotrophic water were recorded in a trap survey. An awareness questionnaire survey showed that newer residents who had moved to the area within the last 10 years tended to have little interest in the stream environment as compared with the responses of older residents. The results suggest a need for social outreach to increase residents’ awareness of the stream and thus fulfil the requirements for environmental improvements.