Home water testing in Ontario: what to test and how

Which water test do you need?

Sources: City of Hamilton⁠^[1]; Public Health Ontario⁠^[3][2]; Government of Ontario.⁠^[4]

Public Health Ontario tests only for bacteria (E. coli and total coliforms).⁠^[3] It says that even if a result shows no bacteria, the water may still have other contaminants such as chemicals.

On city water, call your city about a change in taste, colour or smell. The City of Hamilton says a musty taste in late summer or early fall usually comes from algae in the lake and is not considered a public health problem; for discoloured water that won’t clear, call the City at 905-546-2489.⁠^[5] In Toronto, the City asks you to submit a water quality service request or call 311 if water stays cloudy.⁠^[6]

Home test kits and strips, or a licensed lab?

“Water test kit” can mean two different things:

• A sample kit from a lab or Public Health Ontario: a bottle you fill at home and return. The lab does the test. Public Health Ontario accepts only water collected straight into the bottle from its kit.⁠^[3]
• A test you read yourself at home, such as strips.

We have not found an Ontario or Health Canada source that compares home test strips with lab tests. Public Health Ontario says to contact a licensed laboratory to test for minerals or chemicals, and the City of Hamilton points to licensed labs for lead, so a licensed lab is what we recommend.⁠^[2][1]

Ontario publishes a list of licensed laboratories that can test drinking water. Call before you send a sample: Ontario says to check with the lab that it will accept it. You can also call the Ministry of the Environment at 1-800-565-4923.⁠^[1]

What water testing is free in Ontario?

• Bacteria in private drinking water. Public Health Ontario tests water from wells, cisterns and treated lake water for E. coli and total coliforms for free.⁠^[2] Pick up a sample kit from a Public Health Ontario lab, your public health unit or a pickup location in your area.⁠^[3]
• Lead, in some cities. See the city table in how to test for lead.
• Your city’s annual water report, which lists what the city tested. See find your water system’s annual report.

How long does a water test take?

• Public Health Ontario bacteria test: if you register your sample on its Online Water Testing Portal, your report is online within 2 to 4 business days.⁠^[3] With the paper form, results come by phone, by mail or in person instead.
• A private lab test: ask the lab when you call.

Keep your sample cool, not frozen, until you drop it off.⁠^[3] Public Health Ontario says room temperature or a warm place can affect the accuracy of your result.

How much does a water test cost in Ontario?

The Public Health Ontario bacteria test is free,⁠^[2] and so is lead testing in some cities. For anything else, a licensed lab sets the price: the City of Hamilton says to call the lab to confirm the price and get its instructions for taking the sample.⁠^[1]

“Free water test” offers at your door

A free in-home water test from a company that sells water treatment equipment is a sales visit, not a licensed lab test. In Hamilton, the City says sample bottles left at your door asking you to fill them for pickup are not from the City and are not tested by the City’s lab or the Public Health Ontario lab.⁠^[1]

Ontario’s consumer protection rules say water treatment devices, water purifiers, water filters and water softeners cannot be offered or sold at your home unless you started the contact, for example by calling or emailing the business and asking it to come.⁠^[7] There are some exceptions, such as when you already have a contract in place. If you buy something over $50 from a salesperson at your door or in your home, you have a 10-day cooling-off period to cancel for any reason, starting the day you receive a written copy of the agreement. This is general information, not legal advice.

On city water: what’s already tested

Your city tests the water it supplies and publishes the results every year in its annual water quality report. Ontario’s own figures, and links to the reports for Hamilton, Toronto, Peel, Ottawa, Halton and Waterloo Region, are in is tap water safe to drink in Ontario. Does boiling help? It depends on the problem; see does boiling make water safe.

Who should test first

• Homes built before 1955, for lead. The City of Hamilton says children six and under, pregnant women and women planning a pregnancy are more susceptible to the effects of lead.⁠^[1]
• Homes on a well, cistern or treated lake water, for bacteria. Public Health Ontario says testing is particularly important for households with young children, older adults or anyone with a weakened immune system, and after spring thaw, heavy rain, flooding or well maintenance.⁠^[2]
• Renters and people in apartments or private townhouse complexes: in Hamilton, lead testing goes through your superintendent or property management company. See renters.

Who to call

Have a result? See lead test results for a lead number, or well water testing for a bacteria result.

In Hamilton? See water testing in Hamilton for what’s free and where to drop off a well sample.

Sources

1. City of Hamilton, Lead in Your Drinking Water. Checked November 1, 2026. ↩︎
2. Public Health Ontario, News release, June 3, 2026. Checked November 1, 2026. ↩︎
3. Public Health Ontario, Well Water Testing. Checked November 1, 2026. ↩︎
4. Government of Ontario, Testing and treating private water wells. Checked November 1, 2026. ↩︎
5. City of Hamilton, Drinking Water Quality. Checked November 1, 2026. ↩︎
6. City of Toronto, Tap Water in Toronto. Checked November 1, 2026. ↩︎
7. Government of Ontario, Door-to-door sales and home service contracts. Checked November 1, 2026. ↩︎

• Government of Ontario, List of Licensed Laboratories. Checked 2026-11-01.