Title: Water supply and sanitation in Canada
Content:  Toronto obtains all its drinking water from Lake Ontario. It is then treated in four treatment plants, three along the shore of the lake and one on Centre Island. Waste water is treated in four waste water treatment plants. Average household use was 315 cubic meters/year in 2006. The average annual water and waste water bill in 2006 was CAN$429 for metered customers. In 2006, there were about 72,000 un-metered customers in Toronto. In 2007 the City began providing meters to flat-rate customers and upgrading meters of all 465,000 other customers to enable automated, radio-based meter reading by 2015. 
Title: Toronto waterway system
Content:  The city has many rivers that stretch all over the city and all end up draining into Lake Ontario. Of the various watercourses that drained Toronto, the Don River, the Humber River, and the Rouge River have headwaters in the Oak Ridges Moraine.
Title: Toronto Water
Content:  Before 1842, Toronto's water supply was manually pumped from Lake Ontario, streams and wells. Water carters would take the water and distribute it to customers across the city.
Title: Toronto waterway system
Content:  The Toronto waterway system comprises a series of natural and man-made watercourses in the Canadian city of Toronto. The city is dominated by a large river system spanning most of the city including the Don River, Etobicoke Creek, Highland Creek, Humber River, Mimico Creek and Rouge River.
Title: Toronto Works and Emergency Services
Content:  Toronto maintains a network of water filtration plants, pumping stations and reservoirs providing water to the city of Toronto. Some facilities are located outside the city, there are two reservoirs and one water tank located in York Region.
Title: R. C. Harris Water Treatment Plant
Content:  Despite its age, the plant is still fully functional, providing approximately 30% of Toronto's water supply. The intakes are located over 2.6 km from shore in 15 m of water, running through two pipes under the bed of the lake. Water is also chlorinated in the plant and then pumped to various reservoirs throughout the City of Toronto and York Region.
Title: Toronto Water
Content:  The current system was introduced in the mid-1950s, with the formation of Metro Toronto in 1954, and was managed by Metro Toronto. Following amalgamation in 1998, Toronto Water was created from the Toronto Works and Emergency Services and once part of Metro Toronto Works department. Since 1975, Toronto has supplied water to York Region (mostly to residents in the south end of York).
Title: Toronto Water
Content:  The drinking water distribution system operated by Toronto Water comprises 6 pressure zones and approximately 520 km of watermains (greater than 150 mm in diameter) Pumping stations are located across the city to pump water from the filtration plants to residences. They are particularly critical since the city gains in elevation as it moves northwards away from Lake Ontario. Some pumping stations are located outside the city. There are two pumping stations located outside of the city limits and part of the water service provided to York Region by Toronto:
Title: Toronto Water
Content:  The City of Toronto Water Division is a municipal division of the City of Toronto under Infrastructure and Development Services that is responsible for the water supply network, and stormwater and wastewater management in Toronto, Ontario, Canada, as well as parts of Peel and York Regions.
Title: Public services in Toronto
Content:  Toronto has a vast network to manage water delivery and to process wastewater.

Question: where does toronto get its water from?
Answer: Ashbridges Bay Wastewater Treatment Plant.