Mount Dennis Water Hardness & Quality Report (2026)
Water Hardness
Source
lake
pH Level
8.3
neutral = 7.0
Lead
0.005 mg/L
✓ Below action level
TDS
647.8 mg/L
Est. Daily Cost
$0.67
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 Mount Dennis, your appliances are currently losing 33% efficiency due to mineral buildup.
| Appliance | In Mount Dennis | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 1.5 yrs | 8.5 yrs | -82% |
| Washing Machine | 4.4 yrs | 12 yrs | -63% |
| Water Heater | 5.6 yrs | 15 yrs | -63% |
Regional Water Comparison
How Mount Dennis compares to its nearest neighbours
| City | Hardness | Mineralization | Risk |
|---|---|---|---|
| ▶ Mount Dennis, Ontario | 249.5 mg/L | Very High | 🔴 Very Hard |
| Rockcliffe-Smythe, Ontario | 238.5 mg/L | Very High | 🔴 Very Hard |
| Brookhaven-Amesbury, Ontario | 238.5 mg/L | Very High | 🔴 Very Hard |
| Keelesdale-Eglinton West, Ontario | 239.5 mg/L | Very High | 🔴 Very Hard |
| Junction Area, Ontario | 237.5 mg/L | Very High | 🔴 Very Hard |
National Benchmark
How Mount Dennis compares to the Canada average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Mount Dennis | 249.5 mg/L | 🔴 High |
| Canada National Avg | 141 mg/L | 🟠 Moderate |
| Vancouver Top Rated | 3 mg/L | 🟢 None |
Bring Vancouver-quality water to your Mount Dennis home
Shop water softeners on Amazon.com →
What Makes Mount Dennis's Water Unique?
Local geology and source profile
Mount Dennis (a west Toronto neighbourhood at the Etobicoke boundary near Weston Road and Eglinton Avenue West — the Mount Dennis community at the hub of the Eglinton Crosstown LRT Mount Dennis station, a historically working-class industrial neighbourhood with a diverse Black, Caribbean, West African, and South Asian community, home to the Humber River corridor green space, the historic Kodak Building adaptive reuse project, and one of the most ambitious neighbourhood revitalisation efforts in Toronto's Priority Neighbourhoods program, anchored by the cross-town LRT station and transit-oriented development along the Eglinton corridor) receives its drinking water from the City of Toronto, drawing from Lake Ontario via the F.J. Horgan Water Treatment Plant. Water is treated using ozonation, biofiltration, UV disinfection, and chloramination, meeting all Guidelines for Canadian Drinking Water Quality (GCDWQ) standards. Hardness is 249.5 mg/L (14.6 gpg) — classified as very hard by Health Canada, an anomalously harder sub-zone in west Toronto.
Mount Dennis's 249.5 mg/L is notably harder than the standard west Toronto supply (236–238 mg/L), joining the cluster of anomalously harder Toronto sub-zones including Greenwood-Coxwell (254.5 mg/L), Flemingdon Park (274.5 mg/L), and Hillcrest Village (269.5 mg/L). This west-Toronto Etobicoke-boundary distribution sub-zone appears to draw from a specific F.J. Horgan plant pressure zone with elevated mineral accumulation, consistent with the pattern of harder and softer anomalous sub-zones observed across the Toronto distribution network.
At 249.5 mg/L, Mount Dennis residents face persistent scale challenges — weekly to biweekly kettle and showerhead descaling is typical. The City of Toronto provides multilingual water quality information at toronto.ca/water, including resources in the many community languages of Mount Dennis. Health Canada lead service line precautionary guidance applies to the neighbourhood's pre-war and post-war housing stock for pre-1955 properties in the established Mount Dennis streets.
Geology & Source: Supplied by City of Toronto from Lake Ontario via the F.J. Horgan Water Treatment Plant — the Mount Dennis west Toronto-Etobicoke boundary distribution sub-zone carries anomalously hard water at 249.5 mg/L (14.6 gpg), notably harder than the standard west Toronto supply.