Does Markham have hard water, and do you need a water softener?Yes, Markham’s tap water is considered hard, at about 123 mg/L or 8.6 grains per gallon, according to the City. The water comes from Lake Ontario, is treated in Toronto and Peel, and is chloraminated. Hardness does not affect health, so a softener is a comfort choice for scale and spotting, not a must. Rural homes on wells in north Markham are a different case and need their own testing.
Buyers moving from other cities often ask at inspections whether the softener should stay, go or be added.
Michael John Lau, a REALTOR® with the Kaizen Real Estate Team, one of the most active real estate teams in Markham and York Region, adds water equipment to every buyer’s checklist.
Markham water at a glance
| Item | Detail |
|---|---|
| Source | Lake Ontario |
| Treatment | Toronto and Peel facilities |
| Hardness | About 123 mg/L (8.6 grains per gallon) |
| Disinfection | Chloramine |
Do you need a softener?
Many homes do fine without one. Owners who add a softener usually want less scale on fixtures, kettles and water heaters, and fewer spots on glass. It is a personal choice, not a health need.
Checking existing equipment
- Is the softener owned or rented?
- When was it last serviced?
- Is there a filter or reverse osmosis system under the sink?
- Are any rental contracts transferring on closing?
Questions about a home's water?
Michael John Lau can help you add water equipment checks to your inspection.
Book a buyer consultationSearch Markham homesPrefer to talk? Call the Kaizen Real Estate Team at (647) 370-8885.
Older homes and lead
All known public lead service lines in Markham have been replaced, but private lines and older plumbing may still contain lead. If you suspect lead, the City suggests contacting a plumber and running cold water before drinking.
Well-water homes
Rural homes in north Markham on private wells need their own water tests and treatment. Ultimately, the decision is yours. The goal is to make sure you have all the information before you buy.
Good water questions take minutes and can save surprises later. Call the Kaizen Real Estate Team at (647) 370-8885 or book a consultation.
Frequently asked questions
Does Markham have hard water?
Yes, about 123 mg/L or 8.6 grains per gallon, according to the City.
Where does Markham's water come from?
Lake Ontario, treated in Toronto and Peel.
Is hard water unsafe?
No. The City says hardness does not affect health.
Do I need a water softener in Markham?
It is optional, mainly to reduce scale and spotting.
Is Markham water chlorinated?
It is chloraminated, using chlorine and small amounts of ammonia.
What about homes on wells?
Private wells need their own testing and treatment.
Michael John Lau and Neeraj Moolchandani are licensed REALTORS® with the Kaizen Real Estate Team, eXp Realty, Brokerage, 9763 Markham Rd, Markham, ON L6E 1A4. Licence #4784577. Call (647) 370-8885. Water source, hardness, chloramine and lead details are from the City of Markham Tap Water Quality and Testing page (accessed November 2026). This article is general information only and is not financial, legal or tax advice. Not intended to solicit buyers or sellers currently under contract with another brokerage.
