Municipal water in York Region is safe to drink. That is not the same as saying there is nothing in it. Here is what York Region's own reports show, and what each one actually means for your home.
Where York Region water comes from
Our area runs on three kinds of supply. Keswick, Sutton, Beaverton and Innisfil take theirs from Lake Simcoe. Newmarket, Aurora, East Gwillimbury, King and Stouffville are on York Region municipal water, a blend of local groundwater and Lake Ontario water, and it is hard. Richmond Hill, at the south end of our run, gets Lake Ontario water through Toronto and Peel. Outside the serviced areas, including rural parts of Georgina and Bradford, many homes are on private wells.
The source decides most of what we find. York Region says its water is usually hard or very hard, and its own numbers back that up. The groundwater-heavy systems are the hardest: Stouffville averages 318 mg/L, about 18.6 grains per gallon, and Mount Albert 317 mg/L, about 18.5. Those are very hard. Lake Simcoe water in Keswick and Sutton is hard too: Keswick averages 150 mg/L, about 8.8 grains per gallon. Lake Ontario water is softer, but still hard: Richmond Hill averages 127 mg/L, about 7.4 grains per gallon. Those figures are York Region 2026 Q2 averages. York Region publishes its municipal drinking water test results every year, and you can read the reports for your own system on the York Region drinking water quality page.
Hardness
Calcium and magnesium dissolved from the rock the water passed through. Hardness is not a health issue. It is a cost issue: scale inside water heaters and tankless units, crust on fixtures and shower glass, more soap and detergent, dishwashers and washing machines worn out early. In the hard water towns it is the single most common reason people call us, and a properly sized softener is the fix.
Chlorine and chloramine
Added at the treatment plant so the water stays disinfected through kilometres of pipe. It has done its job by the time it reaches you. What is left is the taste in tea and coffee, the smell in the shower, and the drying effect on skin and hair. A carbon filter at the point of entry removes it. Some supplies use chloramine, which needs catalytic carbon, so we check before specifying.
Lead
Not in the water leaving the plant, but potentially picked up on the way in through lead service lines in the oldest homes, lead solder in homes built before about 1990, and brass fittings. Health Canada sets a maximum acceptable concentration for lead of 0.005 mg/L and asks that levels be kept as low as reasonably achievable (see the Guidelines for Canadian Drinking Water Quality summary table). A lab test from the kitchen tap is the only way to know what your home is adding. Where lead shows up, reverse osmosis at that tap removes it.
PFAS and pharmaceuticals
Trace amounts of per- and polyfluoroalkyl substances and pharmaceutical residue are found in many supplies across Ontario, at low levels. In 2024 Health Canada set a drinking water objective for the combined total of a group of PFAS, replacing its older limits for individual compounds. The Health Canada PFAS objective is 30 ng/L for the sum of 25 PFAS. Conventional treatment does not remove them; reverse osmosis with specialty carbon does, at the drinking tap. Whether to treat is a personal decision, and we give you the lab result rather than a sales pitch.
Sediment, iron and the rest
Fine sediment and rust come from the pipes more than the plant, especially in century homes with galvanized supply. Iron, sulphur, bacteria and nitrates are well water problems, not municipal ones, and belong in a separate article. If you are on a private well, our guide on how to test your well water in Ontario covers the free bacteria test and what it leaves out.
So what should you do?
Start with what you already know. Your water is hard. The kettle told you, and so do York Region's own numbers. You do not need anyone to come out and discover it. Get a softener quote. Before we connect anything we read the hardness at your kitchen tap, then read the same tap again after install. You see both numbers.
Lead, PFAS and bacteria are different. You cannot see them, taste them or read them off a kettle. Those need a lab. If one of them is the worry, or if you are on a private well, book in-depth well water testing and we will arrange the lab panel that answers the question. Then treat only what the results call for.
Common questions
Is York Region tap water safe to drink?
Yes. Municipal water in York Region is treated, disinfected and tested under Ontario's drinking water rules, and the results are published every year. Safe to drink is a health standard. It does not mean the water is soft, free of chlorine taste, or free of what your own plumbing adds on the way to the tap.
Is York Region water hard?
Yes. York Region says its water is usually hard or very hard. Groundwater supplies like Stouffville and Mount Albert are the hardest, over 300 mg/L. Keswick on Lake Simcoe water is hard at 150 mg/L. Even Lake Ontario water in Richmond Hill is hard, at the low end, at 127 mg/L. The white crust on taps, spotty glasses and a kettle that needs descaling are the everyday signs. We read your hardness at the tap before and after install, so the softener is set from your number, not a guess.
Does boiling tap water remove chlorine or lead?
Boiling drives off some chlorine, but it does nothing for lead. As water boils away, anything dissolved in it, lead included, ends up slightly more concentrated in what is left. If lead is the worry, test the kitchen tap and treat it with reverse osmosis.
Do I need a filter if I am on city water?
You do not need one for safety. People add treatment on municipal water for comfort and to protect appliances: a softener for hardness, carbon for chlorine taste and smell, and reverse osmosis at the kitchen tap for the water they drink. Hardness you can already read off your town's published number. Taste you can judge yourself. Lead is the one that needs a lab test at the kitchen tap.
How do I know if my home has a lead service line?
Your town's water department can usually tell you what the pipe from the street to your home is made of. Inside the house, look at where the water line enters: lead pipe is dull grey, soft, and shows a shiny silver scratch. The reliable answer is a lab test of water that has sat in the pipes overnight.
Where can I see York Region's water test results?
York Region posts an annual drinking water quality report for each of its water systems on its drinking water quality and monitoring page. Those reports describe water leaving the system. They do not tell you what your own service line and plumbing add, which is what a test at your tap is for.