Water Hardness Level By City - Ontario

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City Name Province Hardness mg/L Hardness Grains/Gallon Source
Acton ON 312 22 Source
Almonte ON 361 - 463 21 - 27 Source
Ajax ON 125 7.3 Source
Alliston ON 90 5.3
Amherstburg ON 102 6.0
Ancaster ON 120 8.4 Source
Ansnorveldt ON 118 6.9 Source
Arnprior ON 50 2.9 Source
Aurora ON 133 - 138 8.0 Source
Ayr ON 359 21 Source
Azilda ON 80 - 100 4.7 - 5.8
Baden ON 342 20 Source
Ballantrae/Musselman’s Lake ON 229 13.4 Source
Barrie ON 170 - 257, 103 - 137 10 - 15, 6- 8
Beamsville ON 242 14.2
Beaverton ON 148 8.7 Source
Beeton ON 90 5.3
Belleville ON 100 - 144 5.8 - 8.4
Blackstock ON 316 18.5 Source
Bolton ON
115 - 128
7 - 7.6 Source
Bowmanville ON 125 7.3 Source
Bracebridge ON 8 - 12 137 - 205 Source
Branchton Meadows ON 461.7 27 Source
Brampton ON 115 - 128 7 - 7.6 Source
Brantford ON 310 18 Source
Breslau ON 427.5 25 Source
Brighton ON 273 16
Brockville ON 120 7
Brooklin 125 7.3 Source
Buckingham Woods ON 286 16.6 Source
Burks Falls ON 171 10
Burlington ON 121 8.6
Cainsville ON 376 22 Source
Caledon East (Palgrave System) ON 274 - 376 16 - 22 Source
Cambridge (click for more info) ON 291 - 650 17 - 38 Source
Campbellville ON 335 23.5 Source
Cannington ON 312 18.2 Source
Carleton Place ON 88 - 130 5.1 - 7.6 Source
Carp ON 200 11.7 Source
Cayuga ON 120 8.4 Source
Chatham ON 110 - 120 6.4 - 7.0 Source
Chepstow ON 239.4 14
Chippawa ON 131 7.7 Source
Clifford ON 250 14.6
Clinton ON 320 18.7 Source
Cobalt ON 55 3.2
Cobourg ON 115 6.7
Cochrane ON 350 - 380 20.5 - 22.2 Source
Collingwood ON 86 - 94 5 - 5.5 Source
Colling-Woodlands ON 306 17.9 Source
Conestogo - East of Grand River ON 547 32 Source
Conestogo - West of Grand River
ON 359 21 Source
Copper Cliff ON 80 - 100 4.7 - 5.8
Cornwall ON 120 7
Creemore ON 352 20.6 Source
Delhi ON 176 - 180 11.6 - 11.8
Deseronto ON 103 - 122 6 - 7.1 Source
Dryden ON 60 3.5
Dundas ON 120 8.4 Source
Dunnville ON 120 8.4 Source
Elmira ON 325 19
Essex ON 120 7
Etobicoke ON 121 - 142 7.1 - 8.3 Source
Fonthill ON 254 14.9
Fort Williams ON 30 - 60 1.8 - 3.5 Source
Foxboro Green ON 975 57 Source
Galt ON 342 - 410
20 - 24
Gannonoque ON 60 - 120 3.5 - 7
Georgetown ON 336 23.6 Source
Georgina ON 150 8.8 Source
Goderich ON 103 6
Greely ON 350 20.5 Source
Greenbank ON 276 16.1 Source
Grimsby ON 119 7 Source
Guelph ON 360 - 550 21 -  32 Source
Hagersville ON 120 8.4 Source
Haileybury ON 85.6 5
Hamilton ON 120 8.4 Source
Hanover ON 290 - 510 17 - 29.8 Source
Harrow ON 120 7
Hawkesbury ON 54.3 3.2 Source
Heidelberg ON 547 32 Source
Hespeler ON 325 19
Holland Landing ON 173 10.1 Source
Ingersoll ON 313 22 Source
Innerkip ON 860 50 Source
Iroquois Falls ON 81 4.7
Islington ON 121 - 142 7.1 - 8.3 Source
Kapuskasing ON 80 4.7 Source
Kemptville ON 400 23
Kenora ON 72 4.2
Keswick ON 150 8.8 Source
King City ON 135 7.9 Source
Kingston ON 483 - 531, 120 - 133 28 - 31, 7 - 7.8 Source
Kirkland Lake ON 40 2.3
Kitchener (click for more info)
ON
291 - 650
17 - 38 Source
Kleinburg ON 131 7.7 Source
Lake Rosalind ON 428 25
Lansing ON 121 - 142 7 - 8.3 Source
Leamington ON 120 7
Lindsay ON 180 11 Source
Linwood ON 137 8 Source
Listowel ON 261 15.3
Lloyd Brown ON 530 31 Source
London ON 101 - 119 5.9 - 7.0 Source
Lucan ON 102 6 Source
Lucknow ON 206 - 209 12.03 - 12.0
Mannheim Village ON 428 25 Source
Markham ON 128 7.5 Source
Maryhill ON 359 21 Source
Mattawa ON 52.4 3
McKean ON 340 19.9 Source
Meaford ON 90.7 5.3
Merritton ON 124 7.3 Source
Midland ON 257 - 513 15 - 30
Milton (more info here) ON 125 - 295 8.8 -20.7
Mitchell ON 479 28
Mississauga ON
115 - 128
7 - 7.6 Source
Mount Forest ON 269 - 300 15.7 - 17.5
Mount Albert ON 324 18.9 Source
Mt. Pleasannt ON 366 21.4 Source
Munster ON 285 16.7 Source
Musselman's Lake ON 174 10.2 Source
Newcastle ON 125 7.3 Source
New Dundee ON 359 21 Source
New Hamburg ON 325 19 Source
New Liskeard ON 85.6 5
New Lowell ON 50 2.9 Source
New Toronto ON 121 - 142 7 - 8.3 Source
Newmarket ON 135 - 194 7.9 - 11.3 Source
Niagara Falls ON 131 7.7 Source
Nobleton ON 245 14.3 Source
North Bay ON 12 - 21 0.7 - 1.2
North York Twsp. ON 121 - 142 7 - 8.3 Source
Norwick ON 256 18 Source
Oakville ON 121 8.5 Source
Orangeville ON 325 19 Source
Orillia ON 90.4 - 300.8 5.3 - 17.6 Source
Orono ON 309 18.1 Source
Oshawa ON 125 7.3 Source
Ottawa ON 30 1.8 Source
Owen Sound ON 96 5.6
Paisley ON 350 20 - 21
Paris ON 684 37 - 43 Source
Parkhill ON 115 6.7
Parry Sound ON 35 - 60 2 - 3.5 Source
Pembroke ON 20 - 32 1.2 - 1.9
Penetanguishene ON 167 - 250 9.8 - 14.6
Perth ON 80 - 100 4.7 - 5.8
Peterborough ON 91 5.3 Source
Pickering ON 137 8.0 Source
Picton ON 125 7.3 Source
Port Arthur ON 30 - 60 1.8 - 3.5 Source
Port Colborne ON 119 7 Source
Port Dover ON 176 - 180 11.6 - 11.8
Port Elgin ON 107 6.3
Port Hope ON 115 - 121 6.7 - 7 Source
Port Perry ON 274 16 Source
Prescott ON 120 7
Preston ON 325 19
Queensville ON 175 10.2 Source
Renfrew ON 40 2.3
Richmond (King's Park) ON 350 20.5 Source
Richmond Hill ON 123 7.2 Source
Rockwood ON 480 28 Source
Roseville ON 274 16 Source
Sarnia ON 95 5.6
Sault Ste. Marie ON 40 2.3
Scarborough ON 121 - 142 7 - 8.3 Source
Schomberg ON 284 16.5 Source
Seaforth ON 320 18.7 Source
Sharon ON 175 10.2 Source
Shelburne ON 350 19
Shingletown ON 359 21 Source
Simcoe ON 176 - 180 11.6 - 11.8
Smith Falls ON 65
St. Agatha ON 359 21 Source
St. Catharines ON 124 7.3 Source
St. Clements ON 342 20 Source
St. George ON 376 22 Source
St. Jacobs ON 325 19 Source
St. Marys ON 500 30
Stayner ON 274 16 Source
Stouffville/Whitchurch
ON 290 - 358 17 - 20.9 Source
St. Thomas ON 210 12.3
Stratford ON 600 35
Strathroy ON 102 6 Source
Sturgeon Falls ON 52.4 3
Sudbury ON 80 - 100 4.7 - 5.8
Sunderland ON 345 20.2 Source
Tavistock ON 308 22 Source
Tecumseh ON 32 - 140 1.9 - 8.2 Source
Teeswater ON 291 16 - 18
Thornhill ON 132 7.7 Source
Thorold ON 124 7.3 Source
Thunder Bay ON 36 - 50 2 - 3 Source
Tillsonburg ON 84 - 360 6 - 25 Source
Timmins ON 45 2.6
Toronto ON 121 - 142 7 - 8.3 Source
Tottenham (more info here) ON 180 10.5
Trenton ON 200 - 250 11.7 - 14.6
Uxbridge ON 186 10.9 Source
Vaughan ON 132 7.7 Source
Vars ON 200 11.7 Source
Walkerton ON 359 - 393 21 - 23
Wallaceburg ON 115 6.7 Source
Wasaga Beach ON 177 10.4 Source
Waterloo (click for more info)
ON
291 - 650
17 - 38 Source
Welland ON 122 7.1 Source
Wellesley ON 257 15 Source
West Montrose ON 479 28 Source
Weston ON 121 - 142 7 - 8.3 Source
Whitby ON 137 9.6 Source
Windsor ON 95 - 120 5.6 - 7.0 Source
Woodbridge ON 123 8.63 Source
Woodroffe ON 30 1.8 Source
Woodstock ON 313 22 Source