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    Water Hardness Level By City - Ontario

    The Ontario Water Hardness data presented in this chart has all been verified by Aquatell directly from primary sources. Typically, this means we found the data on municipal water reports or we emailed or talked with municipal officials from the public utilities department.

    If the water hardness data from your city is missing from this list please contact us and let us know. We can typically track down the info and add it to our chart in about a week.

    If you're looking to reduce your water hardness level, have a look at a professional-grade water softener.

    Back to Canada Water Hardness Data

    City Name Province Hardness mg/L Hardness Grains/Gallon Source
    Acton ON 324 18.9 Source
    Ailsa Craig (Lake Huron Primary Water Supply System) ON 106 6.2 Source
    Ajax ON 125 7.3 Source
    Alliston (New Tecumseth Water System) ON 118.6 6.9 Source
    Almonte ON 359 - 462 21 - 27
    Alton ON 325 19.0 Source
    Amherstview (Fairfield WTP) ON 125 7.3 Source
    Ansnorveldt ON 116 6.8
    Armow ON 299 17.5
    Arnprior ON 45 2.6 Source
    Arva (Lake Huron Primary Water Supply System) ON 106 6.2 Source
    Aurora ON 130 7.6 Source
    Aylmer (Elgin Area Primary Water Supply System) ON 118 6.9 Source
    Ayr ON 359 21
    Azilda ON 80 - 99 4.7 - 5.8
    Baden ON 342 20
    Bala ON 10.2 0.60 Source
    Ballantrae/Musselman's Lake ON 205 12.0 Source
    Barrie (North & Central - Groundwater) ON 222 - 342 13 - 20 Source
    Barrie (South - Surface Water) ON 51 - 137 3 - 8 Source
    Barry's Bay ON 26 1.52
    Batawa ON 115 6.7
    Bath ON 128 7.5 Source
    Bayfield (Lake Huron Primary Water Supply System) ON 106 6.2 Source
    Baysville ON 13 0.76 Source
    Beachville ON 315 18.4 Source
    Beaverton ON 148 8.7 Source
    Beeton (New Tecumseth Water System) ON 118.6 6.9 Source
    Belle River ON 133.7 7.8 Source
    Belmont ON 188 11
    Birch Point ON 380 22.2 Source
    Blackstock ON 316 18.5 Source
    Bobcaygeon ON 76 4.4 Source
    Bolton (South Peel Water System) ON 125 7.3 Source
    Bowmanville ON 125 7.3 Source
    Bracebridge ON 11.5 0.67 Source
    Bradford West Gwillimbury (Zone 1 - groundwater) ON 110 6.4 Source
    Bradford West Gwillimbury (Zone 2 - surface) ON 130 7.6 Source
    Brampton (South Peel Water System) ON 125 7.3 Source
    Branchton Meadows ON 462 27
    Brantford ON 308 18
    Breslau ON 428 25
    Bright ON 459 26.8 Source
    Brooklin ON 125 7.3 Source
    Brownsville ON 79 4.6 Source
    Buckingham Woods ON 354 20.7 Source
    Burks Falls ON 171 10
    Burlington (Halton Lake-Based Water System) ON 124 7.3 Source
    Cainsville ON 310 18.1 Source
    Caledon East (Palgrave System) ON 320 18.7 Source
    Caledon Village (Caledon Village Water System) ON 235 13.7 Source
    Caledonia (Caledonia WTP) ON 126 7.4 Source
    Cambridge (Region of Waterloo Integrated Urban System) ON 291 - 650 17 - 38
    Campbellford ON 105 6.1 Source
    Campbellville ON 350 20.5 Source
    Canadiana Shores ON 367 21.5 Source
    Cannington ON 312 18.2 Source
    Carleton Place ON 166 - 426 9.7 - 24.9
    Carlisle ON 390 22.8 Source
    Carp ON 198 11.6 Source
    Cayuga (Caledonia WTP) ON 126 7.4 Source
    Centralia (Lake Huron Primary Water Supply System) ON 106 6.2 Source
    Chatham ON 120 7.0 Source
    Cheltenham (Cheltenham Water System) ON 415 24.3 Source
    Chepstow ON 239 14
    Churchill ON 53.7 3.1 Source
    Clifford ON 250 14.6
    Clinton ON 320 18.7
    Cobalt ON 55 3.2
    Cochrane ON 351 - 380 20.5 - 22.2
    Colling-Woodlands ON 402 23.5 Source
    Conestogo - East of Grand River ON 547 32
    Conestogo - West of Grand River ON 359 21
    Copper Cliff ON 80 - 99 4.7 - 5.8
    Courtland (Delhi Water System) ON 231.9 13.6 Source
    Crediton (Lake Huron Primary Water Supply System) ON 106 6.2 Source
    Creemore ON 409 23.9 Source
    Dashwood (Lake Huron Primary Water Supply System) ON 106 6.2 Source
    Delaware (Lake Huron Primary Water Supply System) ON 106 6.2 Source
    Delhi (Delhi Water System) ON 231.9 13.6 Source
    Dereham Centre ON 230 13.5 Source
    Deseronto ON 98 5.7 Source
    Dorchester ON 267 15.6 Source
    Drumbo (Drumbo-Princeton Water System) ON 317 18.5 Source
    Dunnville ON 132 7.7 Source
    Dutton ON 132 7.7
    Elmira ON 325 19
    Elora ON 423 24.7 Source
    Embro ON 512.5 30.0 Source
    Etobicoke (City of Toronto Water System) ON 119 7.0 Source
    Exeter (Lake Huron Primary Water Supply System) ON 106 6.2 Source
    Fenelon Falls ON 52 3.0 Source
    Fergus ON 540 31.6 Source
    Fort William (Bare Point WTP) ON 45.8 2.7 Source
    Foxboro Green ON 975 57
    Frankford ON 115 6.7
    Freelton ON 360 21.1 Source
    Galt ON 342 - 410 20 - 24
    Gananoque ON 60 - 120 3.5 - 7
    Georgetown (Lake-based zone, Halton Lake-Based Water System) ON 125 7.3 Source
    Georgetown (Well-based zone) ON 342 20.0 Source
    Georgina ON 144 8.4 Source
    Glencoe ON 132 7.7
    Grand Bend (Lake Huron Primary Water Supply System) ON 106 6.2 Source
    Gravenhurst ON 12 0.70 Source
    Greely ON 291 17.0 Source
    Greenbank ON 276 16.1 Source
    Greensville ON 500 29.2 Source
    Hagersville (Nanticoke WTP) ON 123 7.2 Source
    Haileybury ON 86 5
    Hampton ON 310 18.1
    Hastings ON 122 7.1 Source
    Hawkesbury ON 54 3.2
    Heidelberg ON 547 32
    Hensall (Lake Huron Primary Water Supply System) ON 106 6.2 Source
    Hespeler ON 325 19
    Hickson ON 353 20.6 Source
    Holland Landing ON 168 9.8 Source
    Huntsville ON 13.6 0.80 Source
    Huron Park (Lake Huron Primary Water Supply System) ON 106 6.2 Source
    Ilderton (Lake Huron Primary Water Supply System) ON 106 6.2 Source
    Ingersoll ON 376 22.0 Source
    Inglewood ON 200 11.7 Source
    Innerkip ON 1061.5 62.1 Source
    Innisfil Heights ON 189 11.1 Source
    Innisfil Lake Simcoe ON 126 7.4 Source
    Iroquois Falls ON 80 4.7
    Islington (City of Toronto Water System) ON 119 7.0 Source
    Janetville ON 233 13.6 Source
    Jarvis (Nanticoke WTP) ON 123 7.2 Source
    Kapuskasing ON 97 5.7 Source
    Kemptville ON 393 23
    Keswick ON 150 8.8 Source
    Kilworth (Lake Huron Primary Water Supply System) ON 106 6.2 Source
    Kincardine ON 95 5.6
    King City ON 131 7.7 Source
    Kings Bay ON 352 20.6 Source
    Kingston ON 113.9 6.7 Source
    Kingston (Cana wells) ON 486 28.4 Source
    Kinmount ON 47 2.7 Source
    Kitchener (Region of Waterloo Integrated Urban System) ON 291 - 650 17 - 38
    Kleinburg ON 133 7.8 Source
    Komoka (Lake Huron Primary Water Supply System) ON 106 6.2 Source
    Lake Rosalind ON 428 25
    Lakeshore ON 90 - 110 5.3 - 6.4 Source
    Lakeside ON 253 14.8 Source
    Lansdowne ON 308 - 393 18 - 23
    Lansing (City of Toronto Water System) ON 119 7.0 Source
    LaSalle (Windsor Utilities Commission) ON 102.5 6.0 Source
    Lindsay ON 180 10.5 Source
    Linwood ON 137 8
    Listowel ON 262 15.3
    Lloyd Brown ON 530 31
    London ON 118 6.9 Source
    Lucan (Lake Huron Primary Water Supply System) ON 106 6.2 Source
    Lucknow ON 205 12.0
    Lyndale (Elgin Area Primary Water Supply System) ON 118 6.9 Source
    Lynden ON 51 3.0 Source
    Lynhurst (Elgin Area Primary Water Supply System) ON 118 6.9 Source
    MacTier ON 30.6 1.79 Source
    Manilla ON 155 9.1 Source
    Mannheim Village ON 428 25
    Manorview ON 174 10.2 Source
    Mariposa Estates ON 303 17.7 Source
    Markham ON 126 7.4 Source
    Maryhill ON 359 21
    Mattawa ON 51 3
    McKean ON 373 21.8 Source
    Meaford ON 91 5.3
    Melbourne ON 132 7.7
    Merrickville ON 380 22.2
    Millbrook ON 220 12.9 Source
    Milton (Lake-based zone, Halton Lake-Based Water System) ON 126 7.4 Source
    Milton (Well-based zone) ON 318 18.6 Source
    Mississauga (South Peel Water System) ON 122.5 7.2 Source
    Mitchell ON 479 28
    Mono Mills (Caledon Village Water System) ON 235 13.7 Source
    Mount Albert ON 317 18.5 Source
    Mount Brydges (Lake Huron Primary Water Supply System) ON 106 6.2 Source
    Mount Elgin ON 206 12.0 Source
    Mount Forest ON 268 - 299 15.7 - 17.5
    Mount Pleasant ON 335 19.6 Source
    Munster ON 255 14.9 Source
    New Dundee ON 359 21
    New Hamburg ON 325 19
    New Liskeard ON 86 5
    New Lowell ON 103 6.0 Source
    New Toronto (City of Toronto Water System) ON 119 7.0 Source
    Newcastle ON 125 7.3 Source
    Newmarket ON 141 8.2 Source
    Nobleton ON 264 15.4 Source
    Norland ON 25 1.46 Source
    North Bay ON 12 - 21 0.7 - 1.2
    North York Twsp. (City of Toronto Water System) ON 119 7.0 Source
    Norwich ON 282 16.5 Source
    Norwood ON 282 16.5 Source
    Oakville (Halton Lake-Based Water System) ON 124 7.3 Source
    Odessa (Fairfield WTP) ON 125 7.3 Source
    Omemee ON 273 16.0 Source
    Orillia (Water Filtration Plant) ON 182 10.6 Source
    Orillia (West Orillia Well) ON 390 22.8 Source
    Orono ON 309 18.1 Source
    Oshawa ON 125 7.3 Source
    Ottawa ON 21.3 1.25 Source
    Otterville ON 295 17.3 Source
    Paisley ON 342 - 359 20 - 21
    Palgrave ON 245 14.3 Source
    Paris ON 625 36.5 Source
    Parkhill (Lake Huron Primary Water Supply System) ON 106 6.2 Source
    Parry Sound ON 34 - 60 2 - 3.5
    Penetanguishene ON 168 - 250 9.8 - 14.6
    Perth ON 79.1 4.6 Source
    Petrolia ON 99.4 5.8
    Pickering ON 125 7.3 Source
    Pinewood ON 149 8.7 Source
    Plattsville ON 1327 77.6 Source
    Pleasant Point ON 315 18.4 Source
    Point Clark ON 308 18.0 Source
    Port Arthur (Bare Point WTP) ON 45.8 2.7 Source
    Port Burwell (Elgin Area Primary Water Supply System) ON 118 6.9 Source
    Port Carling ON 11.4 0.67 Source
    Port Dover ON 134.3 7.9 Source
    Port Hope ON 120 7.0 Source
    Port Perry ON 274 16.0 Source
    Port Rowan ON 111.3 6.5 Source
    Port Severn ON 56.7 3.3 Source
    Port Stanley (Elgin Area Primary Water Supply System) ON 118 6.9 Source
    Port Sydney ON 47 2.7 Source
    Preston ON 325 19
    Princeton (Drumbo-Princeton Water System) ON 317 18.5 Source
    Queensville ON 160 9.4 Source
    Quinte West ON 115 6.7
    Renfrew ON 85.7 5.0 Source
    Richmond (Kings Park) ON 348 20.4 Source
    Richmond Hill ON 127 7.4 Source
    Richmond West ON 263 15.4 Source
    Ridgetown ON 109 6.4
    Ripley ON 216 12.6 Source
    Rockwood ON 470 27.5 Source
    Rodney ON 132 7.7
    Roseville ON 274 16
    Scarborough (City of Toronto Water System) ON 119 7.0 Source
    Schomberg ON 264 15.4 Source
    Scott Point ON 95 5.6
    Seaforth ON 320 18.7
    Sharon (Queensville system) ON 160 9.4 Source
    Shelburne ON 325 19
    Shingletown ON 359 21
    Simcoe ON 294 17.2 Source
    Sonya ON 320 18.7 Source
    Southview Estates ON 75 4.4 Source
    Springfield (Elgin Area Primary Water Supply System) ON 118 6.9 Source
    Springford ON 89 5.2 Source
    St. Agatha ON 359 21
    St. Clements ON 342 20
    St. George ON 410 24.0 Source
    St. Jacobs ON 325 19
    St. Marys ON 513 30
    St. Thomas (Elgin Area Primary Water Supply System) ON 118 6.9 Source
    Stayner ON 293 17.1 Source
    Stoney Point ON 130 7.6
    Stouffville/Whitchurch ON 318 18.6 Source
    Strathroy (Lake Huron Primary Water Supply System) ON 106 6.2 Source
    Stroud ON 130 7.6 Source
    Sturgeon Falls ON 51 3
    Sunderland ON 345 20.2 Source
    Tavistock ON 387 22.6 Source
    Tecumseh (Windsor Utilities Commission) ON 102.5 6.0 Source
    Teeswater ON 274 - 308 16 - 18
    Terra Cotta (Cheltenham Water System) ON 415 24.3 Source
    Thamesford ON 464 27.1 Source
    Thorndale ON 310 18.1 Source
    Thornhill (York Water System) ON 127 7.4 Source
    Thunder Bay (Bare Point WTP) ON 45.8 2.7 Source
    Tilbury ON 120 7.0 Source
    Tillsonburg ON 295.5 17.3 Source
    Timmins ON 44 2.6
    Tiverton ON 499 29.2
    Toronto (City of Toronto Water System) ON 119 7.0 Source
    Tottenham (New Tecumseth Water System) ON 118.6 6.9 Source
    Townsend (Nanticoke WTP) ON 124 7.3 Source
    Underwood ON 95 5.6
    Union (Elgin Area Primary Water Supply System) ON 118 6.9 Source
    Uxbridge ON 186 10.9 Source
    Vars ON 190 11.1 Source
    Vaughan ON 128 7.5 Source
    Victoria Place ON 264 15.4 Source
    Vienna (Elgin Area Primary Water Supply System) ON 118 6.9 Source
    Wallaceburg ON 98 5.7 Source
    Wallacetown ON 132 7.7
    Warkworth ON 219 12.8 Source
    Wasaga Beach ON 178 10.4
    Waterford ON 216 12.6 Source
    Waterloo (Region of Waterloo Integrated Urban System) ON 291 - 650 17 - 38
    Wellesley ON 256 15
    West Lorne ON 132 7.7
    West Montrose ON 479 28
    Western Trent ON 280 16.4 Source
    Weston (City of Toronto Water System) ON 119 7.0 Source
    Wheatley ON 120 7.0 Source
    Whitby ON 125 7.3 Source
    Windsor (Windsor Utilities Commission) ON 102.5 6.0 Source
    Woodbridge (Vaughan) ON 128 7.5 Source
    Woodfield ON 202 11.8 Source
    Woodroffe ON 21.3 1.25 Source
    Woodstock ON 392 22.9 Source
    Woodville ON 281 16.4 Source
    Zurich (Lake Huron Primary Water Supply System) ON 106 6.2 Source