Context Water managers in the Murray–Darling Basin increasingly recognise the cultural and environmental benefits generated by Indigenous co-management of environmental water. However, traditional knowledge and values are subsidiary to western technical and scientific perceptions when prioritising environmental water use. Aims and methods We mapped the locations and volumes of Commonwealth Environmental Water Office environmental watering events onto the wetlands within the land area represented by different state-determined Indigenous organisations and discuss how this relates to the varied nature and extent of Indigenous engagement in environmental watering decisions. Key results Between 2014–15 and 2018–19, one organisation had nearly 13% of the area of wetlands watered, but the average was less than 3%. In all, 18 of the 26 organisations received no environmental water. Conclusions The distribution of environmental flows does not meet the cultural needs of Indigenous nations due to physical restrictions and policy limitations. Yet, there are clear environmental and cultural co-benefits where Indigenous peoples have developed partnerships with environmental water managers. Developing stronger partnerships and increasing Indigenous water entitlements from the current 0.17% of issued entitlements would maximise these benefits in catchments where environmental water is prioritised. Implications The reviews of the Water Act and the Basin Plan scheduled for 2024–26 present opportunities to implement reforms.