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Since 1983

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Disinfecting Drilled Wells

Thanks for visiting Maida New Hampshire & Massachusetts Home Inspection Services educational series. Maida Services, Inc. does not provide or offer referrals for well disinfection. The content below is provided as a courtesy for educational purposes only.

How do I disinfect a drilled well?

Calculate the amount of water in the well by multiplying the gallons per foot by the depth of the well in feet. For example, a well with a 6-inch diameter contains 1.5 gallons of water per foot. If the well is 120 feet deep, multiply 1.5 gallons per foot by 120 feet to get 180 gallons.

CHLORINE BLEACH TO DISINFECT A DRILLED WELL

Diameter of well
(in inches)

Gallons
(per foot)

3

0.37

4

0.65

5

1.0

6

1.5

8

2.6

10

4.1

12

6.0

For each 100 gallons of water in the well, use the amount of chlorine bleach (liquid or granules) indicated in the table below.

AMOUNT OF DISINFECTANT REQUIRED FOR EACH 100 GALLONS OF WATER

Chemical Amount
Laundry bleach (5.25% Chlorine) 3 cups (*)
Hypochloride Granules (70% Chlorine) 2 ounces (**)
(*) 1 cup = 8 ounce measuring cup
(**) 1 ounce = 2 heaping tablespoons of granules

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