How London is built
- Before 1961 25%
- 1961–1990 41%
- 1991–2000 11%
- 2001 or later 24%
Wells in London
Most of London is on city water, but its boundaries include rural areas on the urban fringe.
Local program: Middlesex-London Health Unit offers email reminders to test well water three times a year; bacteria testing is free via the London Public Health Laboratory. Details
How testing works in Ontario
Free bacteria testing through Public Health Ontario labs: pick up a kit at a PHO lab or your public health unit and drop it back off. Chemistry (nitrate, sodium, metals) goes to a licensed private lab for a fee. Local health units recommend testing at least three times a year: spring, summer and fall.
What to test for
- Bacteria (total coliforms and E. coli): at least once a year, and after flooding, heavy rain or work on the well.
- Nitrate, especially near farmland or septic systems.
- Metals and naturally occurring contaminants such as arsenic, uranium or manganese when a well is new and every few years after, depending on local geology.
Well water testing in London: common questions
Is well water testing free in Ontario?
Free bacteria testing through Public Health Ontario labs: pick up a kit at a PHO lab or your public health unit and drop it back off. Chemistry (nitrate, sodium, metals) goes to a licensed private lab for a fee. Local health units recommend testing at least three times a year: spring, summer and fall.
How often should I test my well?
For bacteria, at least once a year and after flooding, heavy rain or well work; many health units recommend more often. Test chemistry when the well is new and every few years after.
Are private wells common in London?
Most of London is on city water, but its boundaries include rural areas on the urban fringe.