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.

The water data is shown in Grains per Gallon. If you wish to convert to mg/L or PPM, take the Grains per Gallon value and multiply by 17.1

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	Hardness Grains per Gallon (GPG)	Source
Acton	22
Almonte	21 - 27
Ajax	7.3	Source
Alliston	5.3
Amherstburg	6.0
Ancaster	8.4
Ansnorveldt	6.9
Armow	17.5	Source
Arnprior	2.9
Aurora	7.6	Source
Ayr	21	Source
Azilda	4.7 - 5.8
Baden	20	Source
Ballantrae/Musselman’s Lake	10.3	Source
Barrie (North & Central - Groundwater)	13 - 20	Source
Barrie (South - Surface Water)	3 - 8	Source
Barry's Bay	0.9 - 2.2	Source
Batawa	6.7
Bayside	6.7
Beachville	25
Beamsville	14.2
Beaverton	8.7	Source
Beeton	5.3
Belle River	8.0
Belleville	5.8 - 8.4
Belmont	11
Birch Point	22	Source
Blackstock	18.5	Source
Bobcaygeon	4	Source
Bolton	7 - 7.6
Bowmanville	7.3	Source
Bracebridge	137 - 205
Bradford	131.7 - 155.6	Source
Brampton	7 - 7.6
Branchton Meadows	27	Source
Brantford	18	Source
Breslau	25	Source
Bright	24
Brighton	16
Brockville	7
Brownsville	5
Brooklin	7.3	Source
Buckingham Woods	16.6	Source
Burks Falls	10
Burlington	8.6
Canadiana Shores	21	Source
Cainsville	22	Source
Caledon East (Palgrave System)	16 - 22
Caledonia	7.0	Source
Cambridge (click for more info)	17 - 38	Source
Campbellford	5.0 - 7.1	Source
Campbellville	23.5
Cannington	18.2	Source
Carleton Place	9.7 - 24.9
Carlisle	22.8	Source
Carp	11.7	Source
Cayuga	7.1	Source
Chatham	6.4 - 7.0
Chepstow	14
Chippawa	7.7	Source
Churchill	3.1	Source
Clifford	14.6
Clinton	18.7
Cobalt	3.2
Cobourg	6.7
Cochrane	20.5 - 22.2
Collingwood	5 - 5.5	Source
Colling-Woodlands	17.9	Source
Conestogo - East of Grand River	32	Source
Conestogo - West of Grand River	21	Source
Copper Cliff	4.7 - 5.8
Cornwall	7
Courtland	13.6	Source
Creemore	20.6	Source
Delhi	13.6	Source
Derham Centre	18
Deseronto	6 - 7.1
Dexter	7
Dorchester	15.6	Source
Drumbo	21
Dutton	7.7
Dryden	3.5
Dundas	8.4
Dunnville	7.0	Source
Elmira	19
Elora	30	Source
Embro	28.7	Source
Essex	7
Etobicoke	7.1 - 8.3
Fenelon Falls	3	Source
Fergus	38	Source
Fonthill	14.9
Fort Williams	1.8 - 3.5
Frankford	6.7
Foxboro Green	57	Source
Freelton	21.1	Source
Galt	20 - 24
Gannonoque	3.5 - 7
Georgetown	23.6
Georgina	8.5	Source
Glencoe	7.7
Goderich	6
Greely	20.5	Source
Greenbank	16.1	Source
Greensville	29.2	Source
Grimsby	7	Source
Guelph	21 - 32	Source
Hagersville	7.1	Source
Haileybury	5
Hamilton	8.4	Source
Hampton	18.1
Hanover	17 - 29.8
Harrow	7
Hastings	5.0 - 7.1	Source
Hawkesbury	3.2	Source
Heidelberg	32	Source
Hespeler	19
Hickson	22
Holland Landing	10	Source
Huntsville	0.8	Source
Ingersoll	19
Innerkip	64
Innisfil Heights	11.1	Source
Innisfil Lake Simcoe	7.4	Source
Iroquois Falls	4.7
Islington	7.1 - 8.3
Janetville	14
Jarvis	7.0	Source
Kapuskasing	4.7	Source
Kemptville	23
Kenora	4.2
Keswick	8.8	Source
Kincardine	5.6
Kings Bay	21	Source
King City	7.4	Source
Kingston	28 - 31, 7 - 7.8	Source
Kinmount	3
Kirkland Lake	2.3
Kitchener (click for more info)	17 - 38	Source
Kleinburg	7.4	Source
Lake Rosalind	25
Lakeshore	5.3 - 6.4	Source
Lakeside	13
Lansdowne	18 - 23
Lansing	7 - 8.3
Lawton's Corners	7
Leamington	7
Lindsay	11
Linwood	8	Source
Listowel	15.3
Lloyd Brown	31	Source
London	5.3 - 6.6	Source
Lucan	6
Lucknow	12.03 - 12.0
Lyndale	7
Lynden	3.0	Source
Lynhurst	7
Manilla	9
Mannheim Village	25	Source
Manorview	10
Mapleton	7
Markham	7.3	Source
Mariposa Estates	18
Maryhill	21	Source
Mattawa	3
McKean	19.9	Source
Meaford	5.3
Melbourne	7.7
Merrickville	22.2
Merritton	7.3	Source
Midland	15 - 30
Millbrook	12.9	Source
Milton (more info here)	8.8 -20.7
Mitchell	28
Mississauga	7 - 7.6
Mount Elgin	17
Mount Forest	15.7 - 17.5
Mount Albert	18.7	Source
Mt. Pleasannt	21.4	Source
Munster	16.7	Source
Musselman's Lake	10.2
Newcastle	7.3	Source
New Dundee	21	Source
New Hamburg	19	Source
New Liskeard	5
New Lowell	2.9	Source
New Toronto	7 - 8.3
Newmarket	8.3	Source
New Sarum	7
Niagara Falls	7.1	Source
Nobleton	14.1	Source
Norland	1.5
Norman	7
North Bay	0.7 - 1.2
North York Twsp.	7 - 8.3
Norwich	18
Norwood	16.5	Source
Oakville	8.5
Omemee	16
Orangeville	19	Source
Orillia	5.3 - 17.6
Orono	18.1	Source
Oshawa	7.3	Source
Ottawa	1.8	Source
Owen Sound	5.6
Paisley	20 - 21
Paris	37 - 43	Source
Parkhill	6.7
Parry Sound	2 - 3.5
Pembroke	1.2 - 1.9
Penetanguishene	9.8 - 14.6
Perth	4.7 - 5.8
Peterborough	5.3
Pickering	7.3	Source
Picton	7.3
Pinewood	9
Pleasant Point	18
Point Clark	18	Source
Port Arthur	1.8 - 3.5
Port Colborne	7	Source
Port Dover	7.9	Source
Port Elgin	6.3
Port Hope	6.7 - 7
Port Perry	16	Source
Port Rowan	7.9	Source
Port Stanley	7
Prescott	7
Preston	19
Princeton	21
Queensville	9.8	Source
Quinte West	6.7
Renfrew	2.3
Richmond (King's Park)	20.5	Source
Richmond Hill	7.5	Source
Ridgetown	6.4
Ripley	12.4	Source
Rockwood	28	Source
Rodney	7.7
Roseville	16	Source
Sarnia	5.6
Sault Ste. Marie	2.3
Scarborough	7 - 8.3
Schomberg	16.4	Source
Scott Point	81.9	Source
Seaforth	18.7
Sharon	10.2
Shelburne	19
Shingletown	21	Source
Simcoe	17.2	Source
Smith Falls	3.8
Sonya	19
Southview Estates	4.4
Sparta	7
St. Agatha	21	Source
St. Catharines	7.3	Source
St. Clements	20	Source
St. George	22	Source
St. Jacobs	19	Source
St. Marys	30
Stayner	16	Source
Stouffville/Whitchurch	18.7	Source
St. Thomas	12.3
Stoney Point	7.6	Source
Stratford	35
Strathroy	6
Stroud	7.6	Source
Sturgeon Falls	3
Sudbury	4.7 - 5.8
Sunderland	20.2	Source
Tavistock	22
Tecumseh	1.9 - 8.2
Teeswater	16 - 18
Thamesford	33
Thorndale	16.8	Source
Thornhill	7.7
Thorold	7.3	Source
Thunder Bay	2.6 - 3
Tillsonburg	6 - 25
Timmins	2.6
Tiverton	29.2	Source
Toronto	6.8	Source
Tottenham (more info here)	10.5
Townsend	7.1	Source
Trent Hills	5.0 - 7.1	Source
Trenton	6.7
Underwood	11.7	Source
Union	7
Uxbridge	10.9	Source
Vaughan	7.4	Source
Vars	11.7	Source
Victoria Place	15
Walkerton	21 - 23
Wallaceburg	6.4
Wallacetown	7.7
Warkworth	5.0 - 7.1	Source
Wasaga Beach	10.4
Waterloo (click for more info)	17 - 38	Source
Waterford	12.6	Source
Welland	7.1	Source
West Gwillimbury	7.7 - 9.1	Source
West Lorne	7.7
Wellesley	15	Source
West Montrose	28	Source
Western Trent	16
Weston	7 - 8.3
Wheatley	7.0
Whitby	7.3	Source
Whites	7
Windsor	5.6 - 7.0
Woodbridge	8.63
Woodfield	12
Woodroffe	1.8
Woodstock	25.0	Source
Woodville	16
Yarmouth Centre	7