Cost guides · 8 min
Cost of water filtration systems in Ontario (2026)
Typical installed prices for softeners, whole-home filters, under-sink RO and well systems across Ontario — plus what drives quotes up or down.
What Ontario homeowners typically pay
Installed residential water treatment in Ontario usually falls in these ranges:
- Under-sink reverse osmosis: $400–$1,500
- Water softener: $1,200–$3,500
- Whole-house filtration: $1,500–$5,000+
- Well combination systems (iron + softener + UV): $2,500–$5,500+
GTA labour and permit complexity can push projects toward the high end; smaller cities and rural installs may land lower if access is simple.
What changes the price
- Hardness level and peak flow rate (softener size)
- Chlorine vs chloramine (media choice)
- Iron, manganese or sulphur on wells
- Space, drain access and electrical for UV
- Existing plumbing condition and bypass valves
Municipal vs well
Most Greater Toronto and Ottawa homes on city water pair a softener with whole-home carbon and kitchen RO. Rural Ontario wells more often need multi-stage treatment after a lab test.
Get a local Ontario quote
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