EPA has proposed to establish “baseline” water quality standards that would apply to all Indian reservation waters where the tribe has not received “treatment as a state” (TAS) authority, the state does not have authority, and the federal government has not already promulgated water quality standards. Under the proposal, tribes will have a limited opportunity to request that certain waters be excluded from the federal baseline standards, but that decision will ultimately be made by the EPA regional administrator. If a tribe receives TAS, promulgates its own water quality standards, and obtains EPA approval of those standards, the federal baseline standards would no longer apply.