[1] The Makalawena Marsh on the Big Island of Hawaiʻi has been listed as a National Natural Landmark to preserve one of its last nesting areas.

[8] The United States Fish and Wildlife Service's 5-year review, conducted in 2010, found that none of the four criteria established for delisting or downlisting of the species had been meet.

[10] On Oʻahu, Maui, Molokaʻi and Kauaʻi, the Hawaiian coot was previously abundant in coastal brackish and fresh-water ponds, streams, and marshes;[11] however, the first censuses conducted in the 1950s and 1960s detected fewer than 1,000 birds statewide.

[12] Since the 1960s, the interannual population size has fluctuated from less than 1,000 birds to over 3,000, and appears to be gradually increasing.

Biannual surveys conducted by the Hawaiian Department of Land and Natural Resource's Division of Forestry and Wildlife (DOFAW) found that between 1998 and 2003 the inter-island coot population averaged 2,100 birds, ranging between 1,500 and 3,000 birds.