Reverse osmosis in Oshawa

Oshawa's water comes from Lake Ontario through the Oshawa Water Supply Plant, the largest plant in the connected Oshawa/Whitby/Ajax system. Its approved capacity is 134,000 cubic metres a day.

• Chlorine: free chlorine in the distribution system ranged 0.30 to 3.60 mg/L in 2025. That's what keeps the water safe in the pipes, and what most people taste.
• Fluoride: added (0.15 to 0.77 mg/L at the Oshawa plant in 2025). If you'd rather drink unfluoridated water, reverse osmosis removes most of it.
• Sodium: 14 to 24.3 mg/L.
• Lead: 106 plumbing samples ranged from non-detect to 0.0032 mg/L in 2025, under the 0.01 mg/L limit.

Source: Region of Durham, Oshawa/Whitby/Ajax Drinking Water System 2025 Annual Report.

A reverse osmosis system under your kitchen sink removes chlorine taste, most dissolved solids, lead, fluoride and sodium from drinking and cooking water. It's bottled-quality water from its own faucet, without carrying cases home.

• Better-tasting water, coffee, tea and ice
• Removes most dissolved solids, lead and fluoride
• Fits under the sink with its own faucet
• Usually costs less than buying bottled water

Spending on bottled water? Our bottled water cost calculator shows your yearly cost.