The Government has been accused of scaremongering after it said Labour's water tax would force Treaty of Waitangi settlements to be renegotiated.
Labour's environment spokesman David Parker said Treaty Negotiations Minister Chris Finlayson was deliberately stoking tensions over the Treaty by making such a claim.
Parker said existing Treaty settlements included clauses which explicitly stated that any claims for freshwater were unresolved.
"The current Ngati Tuwharetoa settlement currently before Parliament ... expressly states [that it] does not affect any rights of iwi and hapu in relation to water," he said.
"Mr Finlayson also knows the settlements with other iwi - including Ngai Tahu and Tainui - are the same. Each includes a similar clause."