Environmentally overburdened communities need information and resources to cope with hazards. We describe, and use a case study to depict, a participatory process of engaging Detroit stakeholders with academic researchers in the co-production of environmental health communication tools to enhance their capacity to address the unjust conditions. Over five years, we disseminated tools to 763 individuals who connected us to their network members so that we reached three times as many (n = 2,273) through snowball methods. On-going demand and evaluation findings indicated that our model was responsive to local circumstances, which may inform and encourage others to engage in such collaborations.