Chlorinating Your Greater Toronto Area Water Well

Chlorination Procedure for Domestic Wells (as per Ministry of Environment Guidelines)


1: Measure the diameter of the well.


2: Measure the depth of the well.


3. From the following table, obtain the volume of water contained in your well for every foot length:


  Inches  |Gallons of Water in the Well

2 inches |0.14

4 inches |0.53

5 inches |0.86

6 inches |1.22

7 inches |1.67

8 inches |2.13

24 inches |19.5

30 inches |30.5

36 inches |44.0


4. After calculating the number of gallons of water in the well, calculate the amount of chlorine-containing material (i.e. household bleach (Javex) or calcium hypochlorite – that is 64 oz of Javex solution or 0.5 lbs of calcium hypochlorite for every 100 gallons of water).


5. Before disinfecting the water supply system, remove or bypass any carbon filter in the system. A filter will tend to remove the chlorine.


6. Thoroughly mix the chlorine solution of powder with the water in the well (e.g. take garden hose to well and run until mixed).


7. Open all the cold water taps in the pressure system until you can smell chlorine and then turn the taps off. This will chlorinate the plumbing fixtures.


8. After the 12 hours, pump this off through your garden hose until the strong smell of chlorine disappears. The remaining amount will not be harmful.


9. In about a week, send a water sample to the local health unit for a bacteriological examination.


10. If the tests show continuing contamination, a second treatment and additional test should be conducted. It is recommended that a well contractor be contacted to surge the well and the surrounding formation with a strong chlorine solution.


11. If additional treatment is still unsatisfactory, the source of the problem should be investigated and corrected. A new well may need to be constructed away from the source of contamination.


If you require additional assistance in finding the right level of chlorine to disinfect your well, please give us a call today!

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