Water Hardness Level By City - Ontario

City Name Province Hardness mg/L Hardness Grains/Gallon Source
Almonte ON 361 - 463 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
Azilda ON 80 - 100
Ballantrae/Musselman’s Lake ON 174 10.2 Source
Barrie ON 170 - 257, 103 - 137 10 - 15, 6- 8
Beamsville ON 242
Belleville ON 100 - 144
Bolton ON
115 - 128
7 - 7.6 Source
Bracebridge ON 8 - 12 Source
Brampton ON 115 - 128 7 - 7.6 Source
Brantford ON 310 18 Source
Brockville ON 120 7
Burks Falls ON 171
Burlington ON 121 8.5
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
Copper Cliff ON 80 - 100
Cornwall ON 120
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
Galt ON 20 - 24
Gannonoque ON 60 - 120 3.5 - 7
Goderich ON 103
Grimsby ON 119 Source
Guelph ON 360 - 550 Source
Hagersville ON 120 8.4 Source
Haileybury ON 85.6
Hamilton ON 120 8.4 Source
Hanover ON 290 - 510 Source
Harrow ON 120 7
Hawkesbury ON
Hespeler ON 325 19
Ingersoll ON 313 22 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 ON 325 19
Lake Rosalind ON 428 25
Lansing ON 121 - 142 Source
Leamington ON 120 7
Lindsay ON 180 11 Source
Listowel ON 261
London ON 101 - 119 Source
Lucan ON 102 Source
Lucknow ON 206 - 209 12.03 - 12.0
Markham ON 128 7.5 Source
Mattawa ON 52.4
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
Musselman's Lake ON 174 10.2 Source
New Liskeard ON 85.6
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
Orillia ON 90.4 - 300.8 5.3 - 17.6 Source
Oshawa ON 137 9.6 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
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
Prescott ON 115 - 125
Preston ON 325 19
Renfrew ON 40
Richmond Hill ON 123 7.2 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
Simcoe ON 176 - 180 11.6 - 11.8
Smith Falls ON 65
St. Catharines ON 124 Source
St. Marys ON 500 30
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
Tavistock ON 308 22 Source
Tecumseh ON 32 - 140 Source
Teeswater ON 291 16 - 18
Thorold ON 124 Source
Tillsonburg ON 84 - 360 6 - 25 Source
Timmins ON 40 - 50
Toronto ON 121 - 142 Source
Trenton ON 200 - 250
Uxbridge ON 137 9.6 Source
Vaughan ON 128 7.5 Source
Walkerton ON 359 - 393 21 - 23
Wallaceburg ON 110 - 120 Source
Waterloo ON 325 19
Welland ON 122 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