Gravenhurst Water Hardness & Quality Report (2026)
Water Hardness
Source
lake
pH Level
7.6
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
278.6 mg/L
Est. Daily Cost
$0.34
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 Gravenhurst, your appliances are currently losing 17% efficiency due to mineral buildup.
| Appliance | In Gravenhurst | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 5.3 yrs | 8.5 yrs | -38% |
| Washing Machine | 8.8 yrs | 12 yrs | -27% |
| Water Heater | 10.4 yrs | 15 yrs | -31% |
Regional Water Comparison
How Gravenhurst compares to its nearest neighbours
| City | Hardness | Mineralization | Risk |
|---|---|---|---|
| ▶ Gravenhurst, Ontario | 129 mg/L | High | 🟠 Hard |
| Bracebridge, Ontario | 169.5 mg/L | High | 🟠 Hard |
| Orillia, Ontario | 129.5 mg/L | High | 🟠 Hard |
| Huntsville, Ontario | 128.5 mg/L | High | 🟠 Hard |
| Midland, Ontario | 238 mg/L | Very High | 🔴 Very Hard |
National Benchmark
How Gravenhurst compares to the Canada average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Gravenhurst | 129 mg/L | 🟠 Moderate |
| Canada National Avg | 141 mg/L | 🟠 Moderate |
| Vancouver Top Rated | 3 mg/L | 🟢 None |
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What Makes Gravenhurst's Water Unique?
Local geology and source profile
Gravenhurst's drinking water is managed by the Town of Gravenhurst, drawing from Lake Muskoka or Muskoka Bay — Gravenhurst is the southernmost town of the District Municipality of Muskoka, the 'Gateway to Muskoka', the picturesque lakeside community at the south end of Lake Muskoka where the Muskoka River meets the southern Muskoka Lakes, home to the RMS Segwun (the world's oldest operating steamship in its original form, on the Muskoka Steamship Heritage), the Bethune Memorial House NHS (the birthplace of Dr. Norman Bethune), and the Muskoka Wharf district waterfront redevelopment on Lake Muskoka's south bay. Water undergoes coagulation, sedimentation, filtration, UV disinfection, and chloramination, meeting all Guidelines for Canadian Drinking Water Quality (GCDWQ) requirements. Hardness measures 129 mg/L (7.5 gpg) — classified as hard by Health Canada, at the softer end of the Muskoka District supply range.
Gravenhurst draws from Lake Muskoka at the south end of the Muskoka Lakes chain — Lake Muskoka sits in the Grenville Province of the Canadian Shield, formed by glacial erosion of the Precambrian metasedimentary and granitic rocks of the Muskoka Highlands. The 129 mg/L for the southern Lake Muskoka supply reflects the mixed Shield granite-gneiss and overlying carbonate glacial till contributions, consistent with the broader Muskoka District supply character (128.5–206 mg/L from reference data), with Gravenhurst at the softer end from the more purely Shield-granitic southern Muskoka watershed.
At 129 mg/L, Gravenhurst homes experience moderate scale deposits — monthly kettle cleaning is typical. Hot water tanks benefit from periodic inspection. The Town of Gravenhurst provides water quality information at gravenhurst.ca. Health Canada lead precautionary guidance applies to pre-1975 properties in the historic Gravenhurst waterfront district and the established cottage-country residential streets above Lake Muskoka.
Geology & Source: Supplied by the Town of Gravenhurst from Lake Muskoka or Muskoka Bay — the Gravenhurst supply from the southern Muskoka lake watershed produces hard water at 129 mg/L (7.5 gpg), at the softer end of the Muskoka District supply range.