Analysis of information sources in references of the Wikipedia article "望安鄉" in Chinese language version.
The other two desalination plants in Penghu are in Wangan Township (望安鄉) and Siyu Township (西嶼鄉).
Wangan Township
Four main islands—Xiyuping, Dongyuping, Xiji, and Dongji—and many small islets and wave-swept rocks are present in this region, which is part of the Wangan Township of Penghu County
Makung Airport has flights to Taipei, Taichung, Chiayi, Kaohsiung, and the offshore islands of Wangan and Chimei.{...}Dongan Vil., Wangan Township, Penghu County 882, Taiwan (R.O.C.)
Wangan Township
The other two desalination plants in Penghu are in Wangan Township (望安鄉) and Siyu Township (西嶼鄉).