Purpose: This study analyzes the contributions of the Healthy Waters educational program to the awareness and understanding of environmental issues related to water to generate changes in attitudes in the community. Design/Approach/Methods: A community school intervention was conducted in a public school in Paredes, Porto, Portugal. Using a participatory research approach, 35 participants were recruited from the seventh and eighth grades. A retrospective pretest/posttest questionnaire was used to assess the influence of the intervention. A thematic analysis of the tutors' logbooks was performed to ascertain the relevant domains of change for students during the intervention. Findings: Results showed statistically significant changes in proenvironmental attitudes and behaviors at the end of the intervention. The effect sizes of the statistical analyses showed that the intervention generally had a positive influence on the environmental awareness of the participants. The tutors' evaluations of the intervention indicated a diversified gain in students' environmental learning. Originality/Value: The results of this study demonstrate that this type of intervention increases students' knowledge of and involvement in environmental issues while reinforcing their environmental citizenship.