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The proposed action would revise the designation of critical habitat for the endangered Southern Resident killer whale distinct population segment, pursuant to section 4 of the Endangered Species Act. Critical habitat for this population is currently designated within inland waters of Washington. In response to a 2014 petition, NMFS is proposing to expand the designation to include areas occupied by Southern Resident killer whales in waters along the U.S. West Coast. Impacts from the designation would stem mainly from Federal agencies' requirement to consult with NMFS, under section 7 of the Endangered Species Act, to ensure that any action they carry out, permit (authorize), or fund will not result in the destruction or adverse modification of critical habitat of a listed species. Federal agencies are already required to consult on effects to the currently designated critical habitat in inland waters of Washington, but consultation would be newly required for actions affecting the expanded critical habitat areas. Federal agencies are also already required to consult within the Southern Resident killer whales' range (including along the U.S. West Coast) to ensure that any action they carry out, permit, or fund will not jeopardize the continued existence of the species; this requirement would not change with a revision to the critical habitat designation.