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Well Disinfection

Well Disinfection

Well disinfection is used to inactivate or control bacteria populations in a well and the distribution system. There are several methods used to disinfect water wells including simple chlorination, shock chlorination or bulk displacement and a procedure for wells that are difficult to disinfect.

Are there things I need to do
before disinfecting my well?

A well should be tested regularly for water quality. If coliforms or Escherichia coli (E. coli)  are repeatedly detected in your well water, the first step to take to eliminate them is to look for the following:

  • Are there any potential contamination sources near the well, such as manure or compost piles, septic disposal fields, or hazardous materials storage?
  • Does the ground slope promote drainage of surface water toward the well or ponding of water around the well?
  • Is the well cap missing, cracked or damaged?
  • Does the well cap allow water or vermin to enter into the well?
  • Does the well casing stick up less than 30 cm (12 inches) from the ground surface (see Figure 1) or the floor of the pump house? Can surface or standing water easily flood over the top of the well casing?
  • Is there an unfilled space or gap between the well casing and the ground around the well e.g. the surface seal is missing or incomplete?
  • Is the well finished below grade?
  • Are there noticeable cracks in the surface seal around the well casing?

If you answered “yes”  to any of the above questions, fix the problem before proceeding with disinfection. Otherwise the well will continue to be vulnerable to contamination.

For information on the treatment of wells that are hard to disinfect click on the document above from the B.C. Provincial Government Site.

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9 – 2180 South Wellington Road
Nanaimo B.C. V9X 1V8
Phone: (250) 753-3333
Fax: (250) 753-3364


Important: This site is for reference only. For confirmation please contact our staff. ABC Water Systems has been providing water system solutions for over 30 years.