Ontario Water Hardness Map
119 cities · average 9.7 GPG
Average hardness
9.7 GPG
Hardest city
Woodstock 30 GPG
Softest city
Norland 1 GPG
Map — Ontario cities by hardness
Very HardHardModerateSoft
Tier distribution
Very Hard33Hard37Moderate42Soft7
Cities ranked by hardness
1Woodstock30 GPGVery Hard2Guelph28.7 GPGVery Hard3Ingersoll25.5 GPGVery Hard4St. George23.4 GPGVery Hard5Waterloo23.4 GPGVery Hard6Thamesford22.5 GPGVery Hard7Paris22 GPGVery Hard8Campbellville20.5 GPGVery Hard9Kitchener20.5 GPGVery Hard10Georgetown20 GPGVery Hard11Orangeville19 GPGVery Hard12Acton18.9 GPGVery Hard13Cainsville18.6 GPGVery Hard14Milton18.6 GPGVery Hard15Stouffville18.6 GPGVery Hard16Mount Albert18.5 GPGVery Hard17Tillsonburg17.5 GPGVery Hard18Simcoe17.19 GPGVery Hard19Barrie16.5 GPGVery Hard20Cambridge16.4 GPGVery Hard21Omemee16 GPGVery Hard22Woodville16 GPGVery Hard23Nobleton15.4 GPGVery Hard24Schomberg15.4 GPGVery Hard25Janetville14 GPGVery Hard26Courtland13.56 GPGVery Hard27Delhi13.56 GPGVery Hard28Waterford12.63 GPGVery Hard29Ballantrae12 GPGVery Hard30Woodfield12 GPGVery Hard31Kawartha Lakes11 GPGVery Hard32Lindsay11 GPGVery Hard33Orillia10.6 GPGVery Hard34Alliston10.2 GPGHard35Beeton10.2 GPGHard36Holland Landing9.8 GPGHard37Queensville9.4 GPGHard38Manilla9 GPGHard39Brantford8.8 GPGHard40Keswick8.8 GPGHard41Georgina8.4 GPGHard42Newmarket8.2 GPGHard43Port Dover7.86 GPGHard44Dunnville7.8 GPGHard45Kleinburg7.8 GPGHard46King City7.7 GPGHard47Aurora7.6 GPGHard48Vaughan7.5 GPGHard49Markham7.4 GPGHard50Richmond Hill7.4 GPGHard51Caledonia7.37 GPGHard52Cayuga7.37 GPGHard53Ajax7.31 GPGHard54Bowmanville7.31 GPGHard55Newcastle7.31 GPGHard56Pickering7.31 GPGHard57Whitby7.31 GPGHard58Brampton7.3 GPGHard59Brockville7.3 GPGHard60Burlington7.3 GPGHard61Mississauga7.3 GPGHard62Oakville7.3 GPGHard63Oshawa7.3 GPGHard64Townsend7.25 GPGHard65Hagersville7.2 GPGHard66Jarvis7.2 GPGHard67Kingston7.2 GPGHard68Hamilton7 GPGHard69Port Colborne7 GPGHard70Toronto7 GPGHard71Aylmer6.9 GPGModerate72Lyndale6.9 GPGModerate73Lynhurst6.9 GPGModerate74Niagara Falls6.9 GPGModerate75Port Burwell6.9 GPGModerate76Port Stanley6.9 GPGModerate77Springfield6.9 GPGModerate78St. Thomas6.9 GPGModerate79Union6.9 GPGModerate80Vienna6.9 GPGModerate81Ansnorveldt6.8 GPGModerate82Welland6.8 GPGModerate83Port Rowan6.51 GPGModerate84St. Catharines6.5 GPGModerate85Thorold6.5 GPGModerate86Tottenham6.5 GPGModerate87Tecumseh6.3 GPGModerate88Windsor6.3 GPGModerate89Ailsa Craig6.2 GPGModerate90Arva6.2 GPGModerate91Bayfield6.2 GPGModerate92Centralia6.2 GPGModerate93Crediton6.2 GPGModerate94Dashwood6.2 GPGModerate95Delaware6.2 GPGModerate96Exeter6.2 GPGModerate97Grand Bend6.2 GPGModerate98Hensall6.2 GPGModerate99Huron Park6.2 GPGModerate100Ilderton6.2 GPGModerate101Kilworth6.2 GPGModerate102Komoka6.2 GPGModerate103Lucan6.2 GPGModerate104Mount Brydges6.2 GPGModerate105Parkhill6.2 GPGModerate106Strathroy6.2 GPGModerate107Zurich6.2 GPGModerate108North Bay6.05 GPGModerate109London6 GPGModerate110Peterborough5 GPGModerate111Sault Ste. Marie4.4 GPGModerate112Bobcaygeon4 GPGModerate113Fenelon Falls3 GPGSoft114Kinmount3 GPGSoft115Thunder Bay2.68 GPGSoft116Timmins2.6 GPGSoft117Ottawa1.8 GPGSoft118Pembroke1.8 GPGSoft119Norland1 GPGSoft