Last updated: October 2026
KNOW YOUR WATER BEFORE YOU TREAT IT
Whole Home Water Filtration for Calgary Homes
The City of Calgary treats and tests the water that reaches your house. A whole home filter is a choice about taste, odour and what flows through your pipes. We test your water first, then show you which equipment fits your goal, and which doesn’t.
Request a water assessment — call 587-792-1456
Weekdays 8 a.m. to 5 p.m. MT
Calgary Water Snapshot (City of Calgary, 2025 data)
| 2025 measure | City of Calgary figure | What it means for your home |
|---|---|---|
| Hardness, city-wide | 141 to 274 mg/L as CaCO3 | Calcium and magnesium from the Bow and Elbow rivers. The City lists “No limit” for hardness. |
| North: Bow River, Bearspaw plant | 141 to 200 mg/L, average 174 | The softer of the two supplies in 2025. |
| South: Elbow River, Glenmore plant | 181 to 274 mg/L, average 224 | The harder supply. Its 2025 high came in January to March. |
| Chlorine residual | 0.82 to 2.01 mg/L | The City adds chlorine to disinfect. Its table sets a minimum of 0.2 mg/L. |
| Hardness and health | “There are no known health effects associated with calcium and magnesium minerals in drinking water.” | Hardness is about scale and soap, a thing you can measure and choose to change. |
| Testing | 208,736 drinking water tests completed in 2025 | The City publishes its results each year. |
The City says that “generally, people in the northern half of the city receive water from the Bow River through the Bearspaw Water Treatment Plant” and that residents in the south “receive most of their water from the Elbow River through the Glenmore Water Treatment Plant.” There is no address lookup, so your own test settles which side you are on.
Plant figures describe treated water “entering the distribution system,” before it travels through your home’s pipes and fixtures. These figures cover Calgary and the communities the City supplies: Chestermere, Airdrie, Strathmore and portions of Foothills County, Rocky View County and Tsuut’ina Nation. In any other town, ask your own water supplier for its data.
Sources: City of Calgary water quality, hardness and data; Bearspaw 2025 summary; Glenmore 2025 summary; Fluoride in Calgary’s water. Checked 2026-10-03.
Read the full guide: Calgary Water Quality.
A whole home filter: what it does, and what it doesn’t
A whole home filter sits on the main water line, so the water to your taps, shower and appliances passes through it. Health Canada names the standards these filters are certified against: NSF/ANSI 42 for aesthetic effects such as taste and odour, and NSF/ANSI 53 for health effects. The certificate lists the specific substances a model is verified to reduce.
A filter is not a softener. Neither NSF/ANSI 42 nor 53 is a hardness standard, and Health Canada lists water softeners under their own standard, NSF/ANSI 44. If white scale on your kettle, taps or shower glass is what bothers you, the softener conversation is the one to have. If chlorine taste or odour is the issue, a filter is where to look.
Filter, softener or reverse osmosis: side by side
| Whole home filter | Water softener | Reverse osmosis (one tap) | |
|---|---|---|---|
| Where it goes | Main water line, all taps | Main water line, all taps | Under the kitchen sink, one drinking tap |
| Health Canada standard | NSF/ANSI 42 (aesthetic effects) or 53 (health effects) | NSF/ANSI 44 (cation exchange water softeners) | NSF/ANSI 58 (reverse osmosis drinking water treatment systems) |
| Built for | Taste and odour such as chlorine (42); specific substances named on its certificate (53) | Hardness: the calcium and magnesium in Calgary’s river water | Drinking and cooking water at one tap |
| White scale on fixtures | Not a hardness standard | The equipment designed for hardness | Treats one tap |
| Worth knowing | Read the certificate for the substance you care about (Health Canada) | City: salt-based softeners “may not be suitable for people on sodium-reduced diets” | Health Canada: RO removes minerals like calcium and magnesium, and water is a minor source of them compared with food. City: NSF/ANSI 58 equipment can remove fluoride. |
| Upkeep | Cartridge changes on the maker’s schedule | Salt and settings on the maker’s schedule | Filter and membrane changes on the maker’s schedule |
Health Canada asks owners to “carefully follow the maintenance instructions included with the device.” We set you up with that schedule at install.
Links: Water softeners · Reverse osmosis · All water treatment
Decision FAQs
Is Calgary tap water safe to drink?
Yes. The City of Calgary treats and tests the water from the Bow and Elbow rivers and says, “Calgarians can be assured that our water is safe and high quality.” Health Canada says water from a community system that meets the national guidelines doesn’t usually need more treatment for health reasons. For most Calgary homes, treatment is a choice about taste, odour and hardness, which you can measure and decide on. The City completed 208,736 drinking water tests in 2025. Read the Calgary Water Quality guide.
Do I need a water filter in Calgary?
For health reasons, Health Canada says you don’t usually need extra treatment if your water comes from a community system that meets the Guidelines for Canadian Drinking Water Quality. The City says Calgary’s water is safe and high quality. Many people choose a filter anyway, for chlorine taste or odour, as a matter of preference. Start with a test of your own tap, so the decision rests on your numbers and your goals. City chlorine residual in 2025: 0.82 to 2.01 mg/L. Request a water assessment, or call 587-792-1456.
Does a whole home water filter soften hard water?
No. Hardness is calcium and magnesium dissolved from rock in the river system, and the filter standards Health Canada lists, NSF/ANSI 42 for aesthetic effects and 53 for health effects, are not hardness standards. Water softeners have their own standard, NSF/ANSI 44. If white scale on taps and shower glass is what bothers you, ask about a softener. If taste or odour is the issue, a filter is the place to look. City 2025 hardness: 141 to 274 mg/L as CaCO3. See water softeners.
Is north or south Calgary water harder?
South, on the City’s 2025 numbers. The City says people in the northern half of the city “generally” get Bow River water from the Bearspaw plant, and the south gets most of its water from the Elbow River through Glenmore. In 2025, Bearspaw water ran 141 to 200 mg/L (average 174) and Glenmore water ran 181 to 274 mg/L (average 224). There is no address lookup, so a test at your tap settles it. Glenmore’s January to March 2025 range was 208 to 274 mg/L, the highest quarter on the City’s table. Request a water assessment to measure your own tap — 587-792-1456.
Does hard water affect my health?
The City of Calgary says, “There are no known health effects associated with calcium and magnesium minerals in drinking water.” Hardness shows up as mineral build-up on taps and fixtures and as soap that is harder to lather. The City adds one caution: salt-based softeners “may not be suitable for people on sodium-reduced diets,” and it recommends researching softener systems before you decide to soften. The City lists “No limit” for hardness in its 2025 table. If anyone in your home follows a sodium-reduced diet, tell the technician at the assessment so the options reflect it.
Does Calgary use chlorine, and can I get rid of the taste?
Yes, the City adds chlorine to disinfect the water, and its 2025 data shows a chlorine residual of 0.82 to 2.01 mg/L. The City’s own tip: fill a container, keep it in the fridge, and “much of the chlorine will dissipate from the water overnight.” If you want taste and odour handled at one tap or for the whole house, look for a filter certified to NSF/ANSI 42. Bearspaw 2025: 0.82 to 1.40 mg/L. Glenmore 2025: 0.88 to 2.01 mg/L.
Should a water filter be NSF/ANSI certified?
Health Canada “strongly recommend[s]” a device certified to the applicable NSF/ANSI standard. Certification means the device doesn’t add anything harmful to the water, and the maker’s claims covered by that standard have been verified. Claims outside the standard are not verified, so read the certificate for the substance or effect you care about. Ask any installer, us included, which standard a system carries. City 2025 data shows hard water (141 to 274 mg/L) with a chlorine residual (0.82 to 2.01 mg/L). Hardness maps to NSF/ANSI 44; chlorine taste and odour map to NSF/ANSI 42.
Should I test my water before buying a filter?
Yes. The City’s figures describe treated water as it enters the distribution system, before it passes through your home’s pipes and fixtures. A test at your tap gives you your own numbers, and those numbers tell you whether a filter, a softener, a reverse osmosis tap or no equipment at all fits your goals. Know your water before you treat it. City 2025 hardness ranged from 141 to 274 mg/L depending on season and supply. Request a water assessment or call 587-792-1456.
The water assessment, step by step
Test > Understand > Treat > Protect > Maintain
- Test. A technician tests the water at your tap and records the readings that matter for your goals.
- Understand. We put your numbers beside the City’s 2025 range for your side of the city and explain what each one means.
- Treat. If you want a change, we show the equipment that matches the goal and the NSF/ANSI standard it carries. If your numbers say you don’t need anything, we tell you that.
- Protect. Our own technicians, on our own payroll, install it.
- Maintain. You leave with the maker’s maintenance schedule for cartridges, salt or membranes.
The assessment measures and reports on your water. It does not diagnose, treat, cure or prevent any illness or condition, and it is not a laboratory test for contaminants. For questions about the safety of the City’s water, call 311.
Cost factors for a whole home system
We don’t publish prices on this page because the right system depends on your test. The price you approve is the price you pay.
- Your goal: taste and odour, hardness, drinking water at one tap, or a mix.
- Your numbers: hardness and chlorine at your tap, and which side of the city supplies you.
- Your household: how many people and bathrooms the system has to keep up with.
- Your mechanical room: space and access at the main water line, and whether the equipment needs a drain or an outlet nearby.
- What’s there now: an older softener or filter to remove or reconnect.
- The system: its NSF/ANSI standard and its capacity.
- Upkeep over time: cartridges, salt or membranes on the maker’s schedule.
Know your water before you treat it
A technician tests your tap, shows you the numbers, and tells you what fits, including when nothing does.
Request a water assessment — call 587-792-1456
Written by Alberta Indoor Comfort. Data: City of Calgary 2025 water quality data and Health Canada drinking water treatment guidance, checked 2026-10-03. Last reviewed: 2026-10-05.
Dont let your family drink any more of that nasty water! Call Alberta Indoor Comfort today at 587-792-1456 and ask about our water purification installation and repair services.