The Saanich Peninsula Treatment Plant serves North Saanich, Central Saanich and the Town of Sidney as well as the Victoria International Airport, the  Institute of Ocean Sciences and the Tseycum and Pauquachin First Nations communities. The plant discharges secondary treated wastewater through a multi-port outfall into Bazan Bay about 25 metres below sea level and almost 1.6 kilometres offshore. Monitoring includes testing for priority substances every three months and for nutrients every month, checking surface water quality monthly, studying the seafloor and the health of organisms living near the outfall every four years, and regular analysis of wastewater to ensure compliance with performance parameters. The quality of the biosolids produced at this treatment plant is monitored on a monthly basis. For more information please see the Saanich Penninsula Treatment Plant 2011 Annual Report.