We explore the ways in which the formal recognition (to some extent) of Indigenous knowledge systems within environmental governance and the role of reconcilition in achieving environmental justice. We examine whether recent agreements between the New Zealand Crown (Crown) and Māori tribal groups (iwi), known as Treaty ‘settlements’, to establish shared co-governance and management over rivers encapsulate and are capable of achieving environmental justice for Māori. We draw on schoalrship on legal and ontological pluralism to consider questions of how to remedy environmental injustice and what reconciliation between Indigenous and non-Indigenous peoples means in settler societies. Rather than seek to provide a singular definition of Indigenous environmental justice (IEJ), we instead examine how Indigenous peoples in Aotearoa New Zealand and other colonial societies are engaged in efforts to negotiate with and challenge the colonial legal orders, develop their laws, policies, and governance frameworks to achieve justice within the freshwater realm.