How hard is Oshawa water?
Durham doesn't publish a hardness figure, but Lake Ontario water measured elsewhere in the GTA runs 119 to 130 mg/L (about 7 to 7.6 grains per gallon), which is hard. Expect similar water here, and confirm it with a free in-home test.
At 7 grains per gallon and up you'll see white scale on taps and shower glass, spots on dishes, a crusty kettle, and water heaters that lose efficiency over time.
Why Oshawa homeowners install softeners
Oshawa has a lot of older housing near the downtown and lakeshore. Older plumbing is where sediment, scale and, in rare pre-1950s homes, lead pipes show up.
- Stops scale in water heaters, dishwashers and washing machines
- Spot-free glassware and shower doors
- Less soap and detergent
- Softer-feeling skin and hair
Which softener fits a Oshawa home?
Oshawa water is chlorinated (free chlorine of 0.30 to 3.60 mg/L in 2025), so most homes are best served by the Enhanced Water Softener, which softens and removes chlorine in one tank. If chlorine doesn't bother you, SoftBlu is a straight, high-capacity softener.
Enhanced Water Softener
Softens hard water and removes chlorine and chloramine in one system.
See Enhanced Water Softener
SoftBlu Water Softener
High-capacity softener that stops scale on fixtures, kettles and appliances.
See SoftBlu Water SoftenerOn a private well in Raglan, Columbus? Iron usually needs to come out before the softener. See well water treatment in Oshawa.
What it costs
Rent monthly with maintenance included, finance with 0% options, or buy outright, with free installation and a 10-year warranty. See payment options.
Source: Region of Durham, Oshawa/Whitby/Ajax Drinking Water System 2025 Annual Report. More about Oshawa water.
Water softeners in nearby towns
Questions
Do I need a water softener in Oshawa?
If you see scale on taps, kettles or shower glass, yes. A free test shows your exact hardness, so we can tell you whether it's worth it.
How long does installation take?
Most softener installs take about an hour, often the day after your water test.
How much salt will I use?
Most households top up the brine tank every month or two. We set the softener to your measured hardness so it doesn't waste salt.
Free in-home water test
Find out what's in your Oshawa water
We test your water at your home, show you what's in it, and recommend the system that fits.
- Free
- About 30 minutes
- No obligation