Water hardness level by city - Ontario

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.

To reduce water hardness, many people use a process called water softening. If you’re considering this approach, have a look at a professional-grade water softener.

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City Name	Province	Hardness mg/L	Hardness Grains/Gallon	Source
Acton	ON	324	18.9	Source
Ailsa Craig (Lake Huron Primary Water Supply System)	ON	106	6.2	Source
Ajax	ON	125	7.3	Source
Alexandria	ON	114	6.7	Source, Source
Alfred (Lefaivre WTP supply)	ON	42	2.5	Source
Alliston (New Tecumseth Water System)	ON	117	6.8	Source, Source, Source
Alton	ON	325	19.0	Source
Ameliasburgh	ON	162	9.5	Source, Source
Amherstburg	ON	105	6.1	Source, Source
Amherstview (Fairfield WTP)	ON	125	7.3	Source
Ancaster (Hamilton Woodward WTP)	ON	120	7.0	Source
Ansnorveldt	ON	116	6.8	Source
Arnprior	ON	45	2.6	Source
Arva (Lake Huron Primary Water Supply System)	ON	106	6.2	Source
Aurora	ON	130	7.6	Source
Aylmer (Elgin Area Primary Water Supply System)	ON	118	6.9	Source
Ayr	ON	359	21.0	Source
Azilda (Valley Drinking Water System)	ON	79	4.6	Source, Source
Baden	ON	342	20.0	Source
Bala	ON	11	0.6	Source
Ballantrae/Musselman's Lake	ON	205	12.0	Source
Barrie (North & Central - Groundwater)	ON	282	16.5	Source
Barrie (South - Surface Water)	ON	94	5.5	Source
Bass Lake Woodlands (Severn)	ON	265	15.5	Source
Bath	ON	128	7.5	Source
Bayfield (Lake Huron Primary Water Supply System)	ON	106	6.2	Source
Bayside (Quinte West)	ON	104	6.1	Source, Source
Baysville	ON	11	0.6	Source
Beachville	ON	315	18.4	Source
Beamsville (Lincoln - DeCew Falls / Grimsby WTPs)	ON	117	6.8	Source, Source
Beardmore	ON	96	5.6	Source, Source
Beaverton	ON	148	8.7	Source
Beeton (New Tecumseth Water System)	ON	117	6.8	Source, Source, Source
Belle River (Lakeshore Water System)	ON	123	7.2	Source
Belleville	ON	108	6.3	Source, Source
Birch Point	ON	380	22.2	Source
Blackstock	ON	316	18.5	Source
Blairs Grove (Huron-Kinloss Lakeshore System)	ON	765	44.7	Source
Blenheim (South Chatham-Kent Water System)	ON	110	6.4	Source
Blezard Valley (Valley Drinking Water System)	ON	79	4.6	Source, Source
Bloomfield (Picton Water System)	ON	117	6.8	Source, Source
Bobcaygeon	ON	76	4.4	Source
Bolton (South Peel Water System)	ON	123	7.2	Source
Bowmanville	ON	125	7.3	Source
Bracebridge	ON	33	1.9	Source, Source
Bradford West Gwillimbury (Zone 1 - groundwater)	ON	110	6.4	Source
Bradford West Gwillimbury (Zone 2 - surface)	ON	130	7.6	Source
Brampton (South Peel Water System)	ON	123	7.2	Source
Branchton Meadows	ON	462	27.0	Source
Brant Airport Area (Airport Drinking Water System)	ON	305	17.8	Source
Brantford (Holmedale WTP)	ON	318	18.6	Source
Breslau	ON	428	25.0	Source
Bridgeview - Burlington (Hamilton supply)	ON	125	7.3	Source
Bright	ON	459	26.8	Source
Brighton	ON	243	14.2	Source, Source
Brockville	ON	118	6.9	Source, Source
Brooklin	ON	125	7.3	Source
Brownsville	ON	79	4.6	Source
Buckingham Woods	ON	354	20.7	Source
Burlington (Halton Lake-Based Water System)	ON	124	7.3	Source
Cainsville (City of Brantford supply)	ON	318	18.6	Source
Caledon East (Palgrave System)	ON	320	18.7	Source
Caledon Village (Caledon Village Water System)	ON	235	13.7	Source
Caledonia (Hamilton Woodward WTP supply)	ON	126	7.4	Source
Callander	ON	28	1.6	Source, Source
Cambridge (Region of Waterloo Integrated Urban System)	ON	479	28.0	Source
Campbellford	ON	105	6.1	Source
Campbellville	ON	350	20.5	Source
Canadiana Shores	ON	367	21.5	Source
Cannington	ON	312	18.2	Source
Capreol (Valley Drinking Water System)	ON	79	4.6	Source, Source
Carlisle	ON	390	22.8	Source
Carp	ON	195	11.4	Source
Casselman	ON	322	18.8	Source
Cayuga (Hamilton Woodward WTP supply)	ON	126	7.4	Source
Centralia (Lake Huron Primary Water Supply System)	ON	106	6.2	Source
Chatham	ON	120	7.0	Source
Chelmsford (Valley Drinking Water System)	ON	79	4.6	Source, Source
Cheltenham (Cheltenham Water System)	ON	415	24.3	Source
Cobourg	ON	123	7.2	Source, Source
Cochrane	ON	145	8.5	Source
Coldwater	ON	303	17.7	Source
Colling-Woodlands	ON	402	23.5	Source
Collingwood	ON	86	5.0	Source, Source
Conestogo - East of Grand River	ON	547	32.0	Source
Conestogo - West of Grand River	ON	359	21.0	Source
Cornwall	ON	120	7.0	Source, Source
Courtice	ON	125	7.3	Source
Courtland (Delhi Water System)	ON	232	13.6	Source
Crediton (Lake Huron Primary Water Supply System)	ON	106	6.2	Source
Creemore	ON	409	23.9	Source
Dashwood (Lake Huron Primary Water Supply System)	ON	106	6.2	Source
Delaware (Lake Huron Primary Water Supply System)	ON	106	6.2	Source
Delhi (Delhi Water System)	ON	232	13.6	Source
Dereham Centre	ON	230	13.5	Source
Deseronto	ON	98	5.7	Source
Dorchester	ON	297	17.4	Source
Dowling	ON	94	5.5	Source, Source
Dresden (Chatham Water System)	ON	120	7.0	Source
Drumbo (Drumbo-Princeton Water System)	ON	317	18.5	Source
Dryden	ON	73	4.3	Source, Source
Dundas (Hamilton Woodward WTP)	ON	120	7.0	Source
Dunnville	ON	132	7.7	Source
Elliot Lake	ON	27	1.6	Source, Source
Elmira	ON	325	19.0	Source
Elora	ON	423	24.7	Source
Embro	ON	513	30.0	Source
Embrun (City of Ottawa supply)	ON	21	1.2	Source, Source
Erieau (South Chatham-Kent Water System)	ON	110	6.4	Source
Etobicoke (City of Toronto Water System)	ON	119	7.0	Source
Exeter (Lake Huron Primary Water Supply System)	ON	106	6.2	Source
Fenelon Falls	ON	52	3.0	Source
Fergus	ON	540	31.6	Source
Fonthill (Welland WTP)	ON	118	6.9	Source
Fort Erie (Rosehill WTP)	ON	119	7.0	Source
Fort Frances	ON	21	1.2	Source, Source
Fort William (Bare Point WTP)	ON	46	2.7	Source
Foxboro Green	ON	975	57.0	Source
Freelton	ON	360	21.1	Source
Garson	ON	201	11.8	Source, Source
Georgetown (Lake-based zone, Halton Lake-Based Water System)	ON	125	7.3	Source
Georgetown (Well-based zone)	ON	342	20.0	Source
Georgina	ON	144	8.4	Source
Glanbrook (Hamilton Woodward WTP)	ON	120	7.0	Source
Glen Walter	ON	122	7.1	Source, Source
Goderich	ON	111	6.5	Source, Source
Grand Bend (Lake Huron Primary Water Supply System)	ON	106	6.2	Source
Grand Valley	ON	350	20.5	Source
Gravenhurst	ON	42	2.5	Source, Source
Greely (Shadow Ridge)	ON	283	16.5	Source
Greenbank	ON	276	16.1	Source
Greensville	ON	500	29.2	Source
Grimsby (Grimsby WTP)	ON	119	7.0	Source
Guelph	ON	462	27.0	Source
Hagersville (Nanticoke WTP)	ON	123	7.2	Source
Hamilton (Woodward WTP)	ON	120	7.0	Source
Hamilton Drive (Guelph/Eramosa)	ON	285	16.7	Source
Hanmer (Valley Drinking Water System)	ON	79	4.6	Source, Source
Hanover	ON	404	23.6	Source, Source
Harrow (Harrow-Colchester South Water System)	ON	104	6.1	Source, Source
Hastings	ON	122	7.1	Source
Hawkesbury	ON	65	3.8	Source, Source
Heidelberg	ON	547	32.0	Source
Hensall (Lake Huron Primary Water Supply System)	ON	106	6.2	Source
Hickson	ON	353	20.6	Source
Holland Landing	ON	168	9.8	Source
Huntsville	ON	14	0.8	Source
Huron Park (Lake Huron Primary Water Supply System)	ON	106	6.2	Source
Huronville South (Huron-Kinloss Lakeshore System)	ON	237	13.9	Source
Ilderton (Lake Huron Primary Water Supply System)	ON	106	6.2	Source
Ingersoll	ON	376	22.0	Source
Inglewood	ON	200	11.7	Source
Innerkip	ON	1062	62.1	Source
Innisfil Heights	ON	237	13.9	Source, Source
Innisfil Lake Simcoe (Alcona, Lefroy, Gilford)	ON	136	8.0	Source, Source
Islington (City of Toronto Water System)	ON	119	7.0	Source
Jackson's Point (Georgina Water System)	ON	144	8.4	Source
Janetville	ON	233	13.6	Source
Jarvis (Nanticoke WTP)	ON	123	7.2	Source
Kapuskasing	ON	97	5.7	Source
Kenora	ON	57	3.3	Source, Source
Keswick	ON	150	8.8	Source
Kilworth (Lake Huron Primary Water Supply System)	ON	106	6.2	Source
King City	ON	131	7.7	Source
Kings Bay	ON	352	20.6	Source
Kingston	ON	113	6.6	Source, Source
Kingston (Cana wells)	ON	486	28.4	Source
Kingsville (Union Water Supply System)	ON	104	6.1	Source, Source
Kinmount	ON	47	2.7	Source
Kirkland Lake	ON	39	2.3	Source, Source
Kitchener (Region of Waterloo Integrated Urban System)	ON	453	26.5	Source
Kleinburg	ON	133	7.8	Source
Komoka (Lake Huron Primary Water Supply System)	ON	106	6.2	Source
L'Orignal (Hawkesbury Water System)	ON	65	3.8	Source, Source
Lakeshore (Belle River WTP)	ON	123	7.2	Source
Lakeside	ON	253	14.8	Source
Lansing (City of Toronto Water System)	ON	119	7.0	Source
LaSalle (Windsor Utilities Commission)	ON	102	6.0	Source
Leamington (Union Water Supply System)	ON	104	6.1	Source, Source
Lefaivre	ON	42	2.5	Source
Limoges	ON	267	15.6	Source
Lincoln (DeCew Falls WTP area)	ON	114	6.7	Source
Lincoln (Grimsby WTP area)	ON	119	7.0	Source
Lindsay	ON	180	10.5	Source
Linwood	ON	137	8.0	Source
Lloyd Brown	ON	530	31.0	Source
London	ON	118	6.9	Source
Lucan (Lake Huron Primary Water Supply System)	ON	106	6.2	Source
Lucknow	ON	208	12.2	Source
Lyndale (Elgin Area Primary Water Supply System)	ON	118	6.9	Source
Lynden	ON	51	3.0	Source
Lynhurst (Elgin Area Primary Water Supply System)	ON	118	6.9	Source
MacTier	ON	30	1.8	Source
Manilla	ON	155	9.1	Source
Manitouwadge	ON	329	19.2	Source, Source
Mannheim Village	ON	428	25.0	Source
Manorview	ON	174	10.2	Source
Marathon	ON	180	10.5	Source
Mariposa Estates	ON	303	17.7	Source
Markham (York Water System)	ON	126	7.4	Source
Maryhill	ON	359	21.0	Source
Midland	ON	209	12.2	Source, Source
Millbrook	ON	220	12.9	Source
Milton (Lake-based zone, Halton Lake-Based Water System)	ON	126	7.4	Source
Milton (Well-based zone)	ON	318	18.6	Source
Mississauga (South Peel Water System)	ON	123	7.2	Source
Mono Mills (Caledon Village Water System)	ON	235	13.7	Source
Mount Albert	ON	317	18.5	Source
Mount Brydges (Lake Huron Primary Water Supply System)	ON	106	6.2	Source
Mount Elgin	ON	206	12.0	Source
Mount Pleasant	ON	325	19.0	Source
Munster	ON	244	14.3	Source
Murdoch Glen (Huron-Kinloss Lakeshore System)	ON	246	14.4	Source
New Dundee	ON	359	21.0	Source
New Hamburg	ON	325	19.0	Source
New Liskeard (Temiskaming Shores)	ON	329	19.2	Source
New Lowell	ON	103	6.0	Source
New Toronto (City of Toronto Water System)	ON	119	7.0	Source
Newcastle	ON	125	7.3	Source
Newmarket	ON	141	8.2	Source
Newtonville	ON	125	7.3	Source
Niagara Falls (Niagara Falls WTP)	ON	119	7.0	Source
Niagara-on-the-Lake (DeCew Falls WTP area)	ON	114	6.7	Source
Niagara-on-the-Lake (Niagara Falls WTP area)	ON	119	7.0	Source
Nipigon	ON	72	4.2	Source, Source
Nobleton	ON	264	15.4	Source
Norland	ON	25	1.5	Source
North Aldershot - Burlington (Hamilton supply)	ON	125	7.3	Source
North York (City of Toronto Water System)	ON	119	7.0	Source
Norwich	ON	282	16.5	Source
Norwood	ON	282	16.5	Source
Nottawa / McKean	ON	373	21.8	Source
Oakville (Halton Lake-Based Water System)	ON	124	7.3	Source
Odessa (Fairfield WTP)	ON	125	7.3	Source
Ohsweken (Six Nations of the Grand River)	ON	294	17.2	Source, Source
Omemee	ON	273	16.0	Source
Orangeville	ON	325	19.0	Source
Orillia (Water Filtration Plant)	ON	182	10.6	Source
Orillia (West Orillia Well)	ON	390	22.8	Source
Orono	ON	309	18.1	Source
Oshawa	ON	125	7.3	Source
Ottawa	ON	21	1.2	Source, Source
Otterville	ON	295	17.3	Source
Owen Sound	ON	92	5.4	Source, Source
Palgrave	ON	245	14.3	Source
Paris	ON	382	22.3	Source
Parkhill (Lake Huron Primary Water Supply System)	ON	106	6.2	Source
Pelham (Welland WTP)	ON	118	6.9	Source
Pembroke	ON	12	0.7	Source, Source
Perth	ON	79	4.6	Source
Peterborough	ON	105	6.1	Source
Petersburg	ON	359	21.0	Source
Pickering	ON	125	7.3	Source
Picton	ON	117	6.8	Source, Source
Pinewood	ON	149	8.7	Source
Plantagenet (Lefaivre WTP supply)	ON	42	2.5	Source
Plattsville	ON	1327	77.6	Source
Pleasant Point	ON	315	18.4	Source
Point Clark	ON	308	18.0	Source
Port Arthur (Bare Point WTP)	ON	46	2.7	Source
Port Burwell (Elgin Area Primary Water Supply System)	ON	118	6.9	Source
Port Carling	ON	13	0.8	Source
Port Colborne (Port Colborne WTP)	ON	116	6.8	Source
Port Dover	ON	134	7.8	Source
Port Elgin (Saugeen Shores Water System)	ON	97	5.7	Source, Source
Port Hope	ON	120	7.0	Source
Port Perry	ON	274	16.0	Source
Port Robinson / Thorold (Niagara Falls WTP area)	ON	119	7.0	Source
Port Rowan	ON	111	6.5	Source
Port Severn	ON	51	3.0	Source
Port Stanley (Elgin Area Primary Water Supply System)	ON	118	6.9	Source
Port Sydney	ON	50	2.9	Source
Prescott	ON	120	7.0	Source, Source
Princeton (Drumbo-Princeton Water System)	ON	317	18.5	Source
Queensville	ON	160	9.4	Source
Quinte West (Trenton Water System)	ON	121	7.1	Source, Source
Red Rock	ON	68	4.0	Source, Source
Renfrew	ON	86	5.0	Source
Richmond (Kings Park)	ON	334	19.5	Source
Richmond Hill (York Water System)	ON	127	7.4	Source
Richmond West	ON	259	15.1	Source
Ripley	ON	216	12.6	Source
Rockland	ON	46	2.7	Source, Source
Rockwood	ON	470	27.5	Source
Roseville	ON	274	16.0	Source
Russell (City of Ottawa supply)	ON	21	1.2	Source, Source
Sandcastle Estates (Severn)	ON	126	7.4	Source
Sarnia (Lambton Area Water Supply System)	ON	99	5.8	Source, Source
Sault Ste. Marie	ON	75	4.4	Source, Source
Scarborough (City of Toronto Water System)	ON	119	7.0	Source
Schomberg	ON	264	15.4	Source
Severn Estates	ON	185	10.8	Source
Sharon (Queensville system)	ON	160	9.4	Source
Shingletown	ON	359	21.0	Source
Simcoe	ON	294	17.2	Source
Smiths Falls	ON	82	4.8	Source, Source
Smithville (Grimsby WTP)	ON	119	7.0	Source
Snake Road - Burlington (Hamilton supply)	ON	122	7.1	Source
Sonya	ON	320	18.7	Source
Southampton (Saugeen Shores Water System)	ON	97	5.7	Source, Source
Southview Estates	ON	75	4.4	Source
Springfield (Elgin Area Primary Water Supply System)	ON	118	6.9	Source
Springford	ON	89	5.2	Source
St-Isidore (Lefaivre WTP supply)	ON	42	2.5	Source
St. Agatha	ON	359	21.0	Source
St. Catharines (DeCew Falls WTP)	ON	114	6.7	Source
St. Clements	ON	342	20.0	Source
St. George	ON	400	23.4	Source
St. Jacobs	ON	325	19.0	Source
St. Thomas (Elgin Area Primary Water Supply System)	ON	118	6.9	Source
St. Williams (Port Rowan Water System)	ON	111	6.5	Source
Stayner	ON	293	17.1	Source
Stoney Creek (Hamilton Woodward WTP)	ON	120	7.0	Source
Stoney Point	ON	122	7.1	Source
Stouffville/Whitchurch	ON	318	18.6	Source
Stratford	ON	469	27.4	Source, Source
Strathroy (Lake Huron Primary Water Supply System)	ON	106	6.2	Source
Sudbury (David Street WTP)	ON	65	3.8	Source, Source
Sudbury (Wanapitei WTP)	ON	52	3.0	Source, Source
Sunderland	ON	345	20.2	Source
Sutton (Georgina Water System)	ON	144	8.4	Source
Sydenham	ON	134	7.8	Source
Tavistock	ON	387	22.6	Source
Tecumseh (Windsor Utilities Commission)	ON	102	6.0	Source
Terra Cotta (Cheltenham Water System)	ON	415	24.3	Source
Terrace Bay	ON	47	2.7	Source, Source
Thamesford	ON	464	27.1	Source
Thamesville (Chatham Water System)	ON	120	7.0	Source
Thorndale	ON	310	18.1	Source
Thornhill (York Water System)	ON	127	7.4	Source
Thorold (DeCew Falls WTP area)	ON	114	6.7	Source
Thorold (Welland WTP area)	ON	118	6.9	Source
Thunder Bay (Bare Point WTP)	ON	46	2.7	Source
Tilbury (Wheatley Water System)	ON	120	7.0	Source
Tillsonburg	ON	296	17.3	Source
Toronto (City of Toronto Water System)	ON	119	7.0	Source
Tottenham (New Tecumseth Water System)	ON	117	6.8	Source, Source, Source
Townsend (Nanticoke WTP)	ON	124	7.3	Source
Union (Elgin Area Primary Water Supply System)	ON	118	6.9	Source
Uxbridge	ON	186	10.9	Source
Val Caron (Valley Drinking Water System)	ON	79	4.6	Source, Source
Val Therese (Valley Drinking Water System)	ON	79	4.6	Source, Source
Vankleek Hill (Hawkesbury Water System)	ON	65	3.8	Source, Source
Vars	ON	183	10.7	Source
Vaughan (York Water System)	ON	128	7.5	Source
Victoria Place	ON	264	15.4	Source
Vienna (Elgin Area Primary Water Supply System)	ON	118	6.9	Source
Walkerton	ON	377	22.0	Source, Source
Wallaceburg	ON	98	5.7	Source
Walpole Island First Nation	ON	92	5.4	Source, Source
Warkworth	ON	219	12.8	Source
Washago	ON	129	7.5	Source
Waterdown (Hamilton Woodward WTP)	ON	120	7.0	Source
Waterford	ON	216	12.6	Source
Waterloo (Region of Waterloo Integrated Urban System)	ON	453	26.5	Source
Wawa	ON	76	4.4	Source, Source
Welland (Welland WTP)	ON	118	6.9	Source
Wellesley	ON	257	15.0	Source
Wellington (Prince Edward County)	ON	126	7.4	Source, Source
West Lincoln (Grimsby WTP)	ON	119	7.0	Source
West Montrose	ON	479	28.0	Source
Western Trent	ON	280	16.4	Source
Weston (City of Toronto Water System)	ON	119	7.0	Source
Westshore (Severn)	ON	130	7.6	Source
Wheatley	ON	120	7.0	Source
Whitby	ON	125	7.3	Source
Whitechurch	ON	292	17.1	Source
Windsor (Windsor Utilities Commission)	ON	102	6.0	Source
Winona (Fifty Road subsystem, Grimsby WTP supply)	ON	119	7.0	Source
Woodbridge (Vaughan)	ON	128	7.5	Source
Woodfield	ON	202	11.8	Source
Woodroffe (Ottawa)	ON	21	1.2	Source, Source
Woodstock	ON	392	22.9	Source
Woodville	ON	281	16.4	Source
Zurich (Lake Huron Primary Water Supply System)	ON	106	6.2	Source

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Water hardness level by city - Ontario

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