Kamwangi is one of three washing stations operated by the New Ngariama Cooperative Society. It is located in the northeast corner of Kirinyaga County, specifically in Nyangeni sub-location, Ngariama location, a region renowned for its coffee production on the slopes of Mount Kenya. Initially, the cooperative started with two plants, Kamwangi and Kainamui. As coffee production expanded, a third station, Kiamugumo, was established to meet the growing demand. Since its establishment in 1983, Kamwangi has cultivated SL28, SL34, Batian, and Ruiru 11 coffee varieties.