Reverse osmosis in Ajax

Ajax's water comes from Lake Ontario through the Ajax Water Supply Plant, which serves Ajax and Pickering and is connected to the Whitby and Oshawa plants.

• Chlorine: free chlorine in the distribution system ranged 0.16 to 5.00 mg/L in 2025. That's what keeps the water safe in the pipes, and what most people taste.
• Fluoride: added (0.12 to 0.85 mg/L at the Ajax plant in 2025). If you'd rather drink unfluoridated water, reverse osmosis removes most of it.
• Sodium: 16.7 to 20.9 mg/L.
• Lead: 60 plumbing samples ranged from non-detect to 0.0018 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.