Dundurn Water Is Very Hard — Here's What It Costs You Each Year

Why Is Dundurn Water So Hard?

Dundurn doesn’t draw its water from a local well. The tap water in this town comes from the South Saskatchewan River, treated and delivered through the SaskWater Saskatoon East Potable Water Supply System, which sources from the City of Saskatoon. That distinction matters, because it means the hardness story starts hundreds of kilometres upstream, not beneath your feet.

The South Saskatchewan River begins in the Rocky Mountains of southern Alberta and flows east across the prairie. As snowmelt and glacier runoff tumble down the eastern slopes, the water picks up dissolved minerals from the sedimentary rock layers it cuts through. The Rockies here are largely limestone, dolomite, and other carbonate-rich formations. Rainwater and meltwater, made slightly acidic by dissolved carbon dioxide, act like a slow solvent on that rock. The chemical reaction is straightforward: slightly acidic water contacts calcium carbonate, and the calcium and magnesium ions dissolve right into the water. That’s the whole story of hardness, really. It’s not contamination; it’s just the river doing what rivers do, carrying dissolved rock downstream.

By the time that water reaches Saskatoon’s treatment plant and then travels east to Dundurn, it has had plenty of time to accumulate dissolved calcium and magnesium. The river also picks up contributions from tributaries draining the surrounding prairie, where glacial till and shale deposits add more mineral content. The result is water measuring 10.53 GPG, or 180 ppm. That puts Dundurn’s supply squarely in the “very hard” category, above the 10.5 GPG threshold the USGS uses to define very hard water. For context, the USGS classifies anything above 7 GPG as hard, and the national average sits around 7.3 GPG. Dundurn runs about 44% harder than that average.

One thing worth understanding: this isn’t a problem Saskatoon or SaskWater could simply filter out. Hardness minerals are dissolved, not suspended, so standard municipal treatment doesn’t remove them. The water is safe, and hardness isn’t regulated as a health hazard by the EPA. It’s purely an aesthetic and economic issue, governed only by a Secondary Maximum Contaminant Level. But that doesn’t make it trivial. At 10.53 GPG, you’re not imagining the film on your glassware or the stiff laundry.

How Dundurn Compares to Nearby Cities

Dundurn sits in a fairly unusual position because its water doesn’t come from a local aquifer. It shares its supply with Saskatoon, and by extension with any community hooked into the SaskWater Saskatoon East system. That means if you’re comparing Dundurn to Saskatoon itself, the hardness is essentially identical. Both draw from the same South Saskatchewan River source, treated at the same facility. Any difference in your glass versus a Saskatoon resident’s glass would come down to plumbing, not the source water.

The more interesting comparison is with smaller communities in the region that rely on groundwater. Many prairie towns in central Saskatchewan pump from deep wells or local aquifers, and those sources tell a completely different hardness story. Groundwater in this part of the province often filters through glacial till, clay, and buried sand and gravel deposits left by retreating glaciers. Depending on the specific aquifer, that water can range from moderately hard to extremely hard, sometimes far exceeding what Dundurn sees from the river. Some nearby communities wrestling with well water report scale problems that make Dundurn’s situation look mild.

The practical difference comes down to consistency. River water, like Saskatoon’s supply, tends to be more stable in hardness year-round, though it can fluctuate with spring runoff and drought conditions. Groundwater supplies are typically more constant but often start with a higher baseline of dissolved minerals. If you’ve lived in a nearby town with a well and noticed more scale on your kettle than you see in Dundurn, you’re not imagining it. That’s the difference between surface water and groundwater on the prairies.

For residents comparing notes with friends in Saskatoon, the honest answer is that your water is their water. The South Saskatchewan River doesn’t change its mineral content between the treatment plant and Dundurn. What changes is the distance it travels through the distribution system, which can affect things like chlorine residual but not hardness. So if someone in Saskatoon tells you their water is softer, they’re mistaken. You’re both drinking the same very hard river water, and both dealing with the same scale buildup, detergent needs, and water heater wear. According to the WQA, hard water raises energy, appliance-wear, and cleaning costs, and that estimate scales with your actual local hardness. At 10.53 GPG, Dundurn sits on the higher end of that curve.

How does Dundurn stack up against the rest of Saskatchewan? It's very hard at 10.53 GPG — White City, Edenwold, and Emerald Park sit nearby with different numbers. See the full hardest-water ranking for context.

See where Dundurn sits on the Saskatchewan water hardness map →

Want the broader explainer on what hardness actually is and how it behaves? Read hard water vs. soft water, explained.