42. Ayr Wastewater Treatment Plant 1292 Nith Rd., Ayr, www.regionofwaterloo.ca/en/living-here/about-wastewater.aspx, Built 1978, 2002, 2006, Access by guided tour only, every 30 minutes. Closed-toe shoes required to tour facility. Water that leaves a building through a drain – whether a sink, toilet, shower, bathtub, dishwasher or washing machine – is wastewater. Where does it go from there? Find out: tour infrastructure and buildings at Ayr Wastewater Treatment Plant (WWTP), one of the Region of Waterloo’s thirteen facilities that together process more than 180 million litres of wastewater daily. Located in a bend of the Nith River, Ayr WWTP screens, settles, aerates, clarifies, filters, and UV disinfects wastewater delivered by two wastewater pumping stations in Ayr. On an average day, approximately 270 litres per resident flows into the plant. Take the very rare opportunity to see behind the scenes of this very essential service! • Water Theme Site • Parking • Guided tours