A survey conducted by Huang Chao-chin of the Taiwan Endemic Species Research Institute in 1993 found Hygrophila pogonocalyx growing only along the Taichung County coast in Ta-an, Chingshui and Lungching. It mostly is found around water paddies and fishponds.
根據台灣特有生物中心研究員黃朝慶 1993 年調查，大安水蓑衣只生長在台中縣的大安鄉、清水鄉和龍井沿海一帶，其生育地多半鄰近田地與魚塭。