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Mississauga draws its municipal water from Lake Ontario through Peel Region's South Peel Drinking Water System, the same source shared with neighbouring Brampton. Peel Region's own 2025 water quality testing puts hardness at 7.0 to 7.6 grains per gallon (120–130 mg/L) - officially described by Peel Region itself as "moderately hard." Rural properties in Mississauga's northern fringe near the Caledon border are largely on private wells rather than the municipal system.
Is Mississauga's water hard?
Yes. Mississauga's municipal water is officially classified as moderately hard, 7.0 to 7.6 grains per gallon per Peel Region's own 2025 testing. It's safe to drink - Peel Region confirms 99.99% of over 4,000 samples met Ontario Drinking Water Quality Standards - but water in this range still causes scale buildup on fixtures, reduced water heater efficiency, and spotting on dishes and glassware over time.
Mississauga's water is treated with chlorine, not chloramine - chloramine is used specifically for the portion of South Peel's water sent on to York Region, not for water delivered to Mississauga homes, according to Peel Region's own 2025 water quality report. Chlorine keeps the water safe from bacteria, but it's also why tap water can carry a noticeable chlorine taste or smell right at the faucet.
There's a second, separate issue worth knowing about: in summer and fall, algae blooms in Lake Ontario can produce a compound that gives water a musty or earthy smell. Peel Region confirms this is harmless and not a safety concern - but it's noticeable, and no amount of "is my water safe" reassurance changes the fact that it's unpleasant to drink or cook with.
Chlorine is added at Peel Region's treatment plants to disinfect the water before it reaches your home. It's safe, but the taste and smell are real - a whole-home or under-sink chlorine filter removes it without affecting the water's safety.
This is a seasonal issue caused by algae blooms in Lake Ontario, most common in summer and fall. Peel Region confirms it's harmless, but a carbon filtration stage - built into several Kent systems - reduces it noticeably.
Not sure which system fits your home? Match the symptom to the fix:

Scale on your kettle, spotty dishes, or a water heater working harder than it should?
That's hardness - the Kent DropPro Connect whole-home softener handles it directly, with app-based monitoring so you can see it working.

Both hardness and a chlorine taste or smell from the tap?
The Kent 5.0 Filter + Softener Duplex Tanks System solves both in one install - the filter protects the softener's resin from chlorine damage while clearing the taste.

Want the cleanest possible drinking water at the tap, with full mineral restoration?
The Kent NL7 Reverse Osmosis System is Kent's most thorough option - 7 stages of filtration plus a remineralization cartridge for taste.

Tight under-sink cabinet, or want the simplest possible install?
The Kent Vue+ has a slim, enclosed casing built specifically for compact spaces and runs entirely on household water pressure.

On a private well in Mississauga's northern fringe near Caledon?
Well water isn't filtered by the municipal system - hardness, iron and sulfur all need their own test first. Start with a Well Water Softener and add Iron/Sulfur Filtration or UV Disinfection if your test shows it's needed.

Not sure which one describes your home?
A free water test tells us exactly what you need. Book a Free Water Test.
We're a five-minute drive from most of Mississauga. Our Mississauga office sits on Traders Blvd E, and our technicians know this city's neighbourhoods well - from Port Credit and Lorne Park's older homes with original plumbing, to the newer builds going up in Meadowvale, Erin Mills, and Streetsville. That local footprint means faster scheduling and a technician who's likely already worked on a system like yours.
Rated 4.9 stars on Google - verified via Kent Water's Google Business Profile. Kent Water is a member of the Canadian Water Quality Association (CWQA).
Your water test costs nothing, and there's no obligation to buy anything afterward.
Start with a free professional water test - we'll identify exactly what your water needs and recommend the right system for your home. No pressure, no obligation.