PURPOSE.To describe the application of group‐appropriate methods to derive actual nursing diagnoses for a community. METHODS.A triangulation method using multiple sources of data, including an environmental survey, fish consumption survey, government reports, publications, and community assessments FINDINGS. Three priority community environmental nursing diagnoses for aggregates within the community: Knowledge deficit among community residents related to lack of awareness of contaminants in the Anacostia River; “risk for adverse human health effects” among pregnant and nursing women and preschoolers related to consumption of chemically contaminated fish; and knowledge deficit among community residents related to lack of awareness of health effects of consuming chemically contaminated fish. CONCLUSIONS. The diagnoses serve as the basis for community education and other interventions. The methods are practical and useful for this type of research. PRACTICE IMPLICATIONS. The nursing profession is experiencing a growing awareness of the close relationship between environmental health and the health of individuals and communities. There is a need for diagnostic labels to describe the responses of aggregates and communities to environmental hazards and conditions.