Over-limit tests
When a public lab result is flagged as above an Ontario standard, our pages call it an over-limit test and may show a count. Here is the calm reading.
Lab result
one sample, one date
Compared to standard
rules set the bar
Flagged → follow-up
not every home affected
What a flag is
The source data marks some tests as above an Ontario drinking-water standard for that substance. We show the flag and the name of the substance. We do not invent our own limits or turn one result into a safe/unsafe verdict for your house.
What it is not
- Not proof that every tap in town was affected.
- Not a live alert about today.
- Not medical advice.
What to do
- Open the detail on the system page to see substance and years.
- If you need the full official story, ask your city for the annual report or contact them with these questions.
One flagged test is a reason to look closer in the public file — not a reason to panic about
every glass in the city.