Water Hardness Level By City - Ontario

City Name Province Hardness mg/L Hardness Grains/Gallon Source
Acton ON 312 21.9 Source
Almonte ON 361 - 463 Source
Ajax ON 125 7.3 Source
Amherstburg ON 102 - 105
Ancaster ON 120 8.4 Source
Ansnorveldt ON 112 6.5 Source
Arnprior ON 50 Source
Aurora ON 133 7.7 Source
Ayr ON 21 Source
Azilda ON 80 - 100
Baden ON 20 Source
Ballantrae/Musselman’s Lake ON 174 10.2 Source
Barrie ON 170 - 257, 103 - 137 10 - 15, 6- 8
Beamsville ON 242
Beaverton ON 148 8.7 Source
Belleville ON 100 - 144
Blackstock ON 316 18.5 Source
Bolton ON
115 - 128		 7 - 7.6 Source
Bowmanville ON 125 7.3 Source
Bracebridge ON 8 - 12 Source
Branchton Meadows ON 27 Source
Brampton ON 115 - 128 7 - 7.6 Source
Brantford ON 310 18 Source
Breslau ON 25 Source
Brockville ON 120 7
Brooklin 125 7.3 Source
Buckingham Woods ON 286 16.6 Source
Burks Falls ON 171
Burlington ON 121 8.6
Cainsville ON 376 22 Source
Caledon East (Palgrave System) ON 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 Source
Cayuga ON 120 8.4 Source
Chatham ON 110 - 120 Source
Chepstow ON 14
Chippawa ON 131 Source
Clifford ON 250
Clinton ON 320 Source
Cobalt ON 55
Cobourg ON 115 6.7
Cochrane ON 350 - 380 Source
Collingwood ON 86 - 94 Source
Colling-Woodlands ON 306 17.9 Source
Conestogo - East of Grand River ON 32 Source
Conestogo - West of Grand River 		ON 21 Source
Copper Cliff ON 80 - 100
Cornwall ON 120
Creemore ON 352 20.6 Source
Delhi ON 176 - 180 11.6 - 11.8
Deseronto ON 103 - 122 Source
Dryden ON 60
Dundas ON 120 8.4 Source
Dunnville ON 120 8.4 Source
Elmira ON 325 19
Essex ON 120 7
Etobicoke ON 121 - 142 Source
Fonthill ON 254
Fort Williams ON 30 - 60 Source
Foxboro Green ON 57 Source
Galt ON 342 - 410
20 - 24
Gannonoque ON 60 - 120 3.5 - 7
Georgetown ON 336 23.6 Source
Goderich ON 103 6
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 Source
Harrow ON 120 7
Hawkesbury ON
Heidelberg ON 32 Source
Hespeler ON 325 19
Ingersoll ON 313 22 Source
Innerkip ON 860 50 Source
Iroquois Falls ON 81
Islington ON 121 - 142 Source
Kapuskasing ON 80 4.7 Source
Kemptville ON 400 23
Kenora ON 72
Kingston ON 483 - 531, 120 - 133, 120 -126 Source
Kirkland Lake ON 40
Kitchener (click for more info) 		ON
291 - 650 		17 - 38 Source
Lake Rosalind ON 428 25
Lansing ON 121 - 142 Source
Leamington ON 120 7
Lindsay ON 180 11 Source
Linwood ON 8 Source
Listowel ON 261
Lloyd Brown ON 31 Source
London ON 101 - 119 Source
Lucan ON 102 Source
Lucknow ON 206 - 209 12.03 - 12.0
Mannheim Village ON 25 Source
Markham ON 128 7.5 Source
Maryhill ON 21 Source
Mattawa ON 52.4
McKean ON 340 19.9 Source
Meaford ON 90.7
Merritton ON 124 Source
Midland ON 257 - 513 15 - 30
Mitchell ON 479 28
Mississauga ON
115 - 128		 7 - 7.6 Source
Mount Forest ON 269 - 300 15.7 - 17.5
Mount Albert ON 302 17.7 Source
Mt. Pleasannt ON 366 21.4 Source
Musselman's Lake ON 174 10.2 Source
Newcastle ON 125 7.3 Source
New Dundee ON 21 Source
New Hamburg ON 19 Source
New Liskeard ON 85.6
New Lowell ON 50 2.9 Source
New Toronto ON 121 - 142 Source
Newmarket ON 141 - 199 Source
Niagara Falls ON 131 Source
Nobleton ON 254 14.9 Source
North Bay ON 12 - 21
North York Twsp. ON 121 - 142 Source
Norwick ON 256 18 Source
Oakville ON 121 8.5 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 Source
Owen Sound ON 96
Paisley ON 350 20 - 21
Paris ON 684 37 - 43 Source
Parkhill ON 115
Parry Sound ON 35 - 60 Source
Pembroke ON 20 - 32
Penetanguishene ON 167 - 250
Perth ON 80 - 100
Peterborough ON 90.8 - 91 Source
Pickering ON 137 8.0 Source
Picton ON 125 Source
Port Arthur ON 30 - 60 Source
Port Colborne ON 119 Source
Port Dover ON 176 - 180 11.6 - 11.8
Port Elgin ON 107
Port Hope ON 115 - 121 Source
Port Perry ON 274 16 Source
Prescott ON 115 - 125
Preston ON 325 19
Renfrew ON 40
Richmond Hill ON 123 7.2 Source
Roseville ON 16 Source
Sarnia ON 95
Sault Ste. Marie ON 40
Scarborough ON 121 - 142 Source
Schomberg ON 283 16.5 Source
Seaforth ON 320 Source
Shelburne ON 350 19
Shingletown ON 21 Source
Simcoe ON 176 - 180 11.6 - 11.8
Smith Falls ON 65
St. Agatha ON 21 Source
St. Catharines ON 124 Source
St. Clements ON 20 Source
St. George ON 376 22 Source
St. Jacobs ON 19 Source
St. Marys ON 500 30
Stayner ON 274 16 Source
Stouffville/Whitchurch 		ON 331 19.4 Source
St. Thomas ON 210
Stratford ON 600 35
Strathroy ON 102 Source
Sturgeon Falls ON 52.4
Sudbury ON 80 - 100
Sunderland ON 345 20.2 Source
Tavistock ON 308 22 Source
Tecumseh ON 32 - 140 Source
Teeswater ON 291 16 - 18
Thornhill ON 132 7.7 Source
Thorold ON 124 Source
Thunder Bay ON 36 - 50 2 - 3 Source
Tillsonburg ON 84 - 360 6 - 25 Source
Timmins ON 40 - 50
Toronto ON 121 - 142 Source
Trenton ON 200 - 250
Uxbridge ON 186 10.9 Source
Vaughan ON 128 7.5 Source
Walkerton ON 359 - 393 21 - 23
Wallaceburg ON 110 - 120 Source
Waterloo (click for more info) 		ON
291 - 650 		17 - 38 Source
Welland ON 122 Source
Wellesley ON 15 Source
West Montrose ON 28 Source
Weston ON 121 - 142 Source
Whitby ON 137 9.6 Source
Windsor ON 95 - 120 Source
Woodbridge ON 123 8.63 Source
Woodroffe ON 30 Source
Woodstock ON 313 22 Source