Opening hours of Sewage treatment plant in Wellesley, Western Australia Opening hours of Sewage treatment plant in Wellesley, Western Australia Home / Western Australia / Wellesley / Sewage treatment plant Sewage treatment plant Kemerton Wastewater Treatment Plant Wellesley WA 6233, Wellesley, Western Australia 6233 (08) 9420 3645 Categories of local businesses in Wellesley Establishment Park Power station Sewage treatment plant Shopping & Services