Ottawa Water Hardness & Quality Report (2026)
Water Hardness
~0–59 mg/L
Softestimated · not lab-verified
Source
mixed
pH Level
7
neutral = 7.0
Lead
0.005 mg/L
✓ Below action level
TDS
12.4 mg/L
Est. Daily Cost
$0.08
energy & soap waste
Source: Health Canada Water Quality · Updated 2026
0–60
mg/L
Soft
61–120
mg/L
Moderately Hard
121–180
mg/L
Hard
180+
mg/L
Very Hard
Appliance Damage Report
In Ottawa, your appliances are currently losing 4% efficiency due to mineral buildup.
| Appliance | In Ottawa | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 8.2 yrs | 8.5 yrs | -4% |
| Washing Machine | 11.5 yrs | 12 yrs | -4% |
| Water Heater | 14.4 yrs | 15 yrs | -4% |
Regional Water Comparison
How Ottawa compares to its nearest neighbours
| City | Hardness | Mineralization | Risk |
|---|---|---|---|
| ▶ Ottawa, Ontario | ≈ 0–59 mg/L | Low | 🟢 Soft |
| Centretown, Ontario | ≈ 0–60 mg/L | Medium | 🟢 Soft |
| The Glebe, Ontario | ≈ 120–179 mg/L | Medium | 🟠 Hard |
| Hull, Quebec | ≈ 0–60 mg/L | Medium | 🟢 Soft |
| Lowertown, Ontario | ≈ 120–179 mg/L | High | 🟠 Hard |
National Benchmark
How Ottawa compares to the Canada average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Ottawa | ≈ 0–59 mg/L | 🟢 None |
| Canada National Avg | 140 mg/L | 🟠 Moderate |
| Vancouver Top Rated | 3 mg/L | 🟢 None |
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What Makes Ottawa's Water Unique?
Local geology and source profile
The City of Ottawa Water Services manages a mixed water supply for the National Capital Region. Most residents receive water from the Ottawa River, which begins in Quebec and travels through the city. Additional water comes from municipal groundwater wells tapping into local aquifers. Before reaching homes, this water is treated at several facilities. Ottawa Public Health and the Medical Officer of Health work with Water Services to ensure the water meets Canadian drinking water standards.
The Ottawa River watershed traverses the Canadian Shield, an area known for its Precambrian granitic and metamorphic bedrock. This geology results in very soft water, around 30 mg/L hardness. Conversely, municipal wells draw from sedimentary formations rich in limestone and dolomite. These carbonate-rich underground layers readily dissolve into the groundwater, leading to hard to very hard water, with hardness levels ranging from 200 to 350 mg/L.
Homeowners getting soft water from the Ottawa River supply won't see much scale buildup on appliances, water heaters, or plumbing. However, those on well water will likely deal with hard water issues like mineral deposits on fixtures, less efficient appliances, soap scum, and potential pipe damage over time. A water softener is often recommended for these hard water supplies. While the City of Ottawa confirms hard water is safe to drink, it can impact taste and leave spots on dishes or residue on skin and hair. Residents can contact 3-1-1 with any concerns.
Geology & Source: Ottawa River Precambrian Shield bedrock; granitic terrain produces very soft water; wells in sedimentary limestone/dolomite produce hard water
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