Bacteria and Other Microorganisms in Household Water

  • Parrott, Kathleen;
  • Ross, Blake;
  • Woodard, Janice
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Table 1a -- Liquid Chlorine Bleach
Table 1b -- Calcium Hypochloride

Table 1a. Quantities of liquid chlorine bleach (5.25% chlorine) required for water well disinfection.
Well Diameter (in.)
Depth of
water in
well (ft) 		2 3 4 5 6 8 10 12 16 20 24 28 32 36 42 48
5 1C 1C 1C 1C 1C 1C 1C 1C 2C 4C 1Q 2Q 3Q 3Q 4Q 5Q
10 1C 1C 1C 1C 1C 1C 2C 2C 1Q 2Q 3Q 4Q 4Q 6Q 8Q 2.5G
15 1C 1C 1C 1C 1C 2C 3C 4C 2Q 2.5Q 4Q 5Q 6Q 2G 3G 4G
20 1C 1C 1C 1C 1C 2C 4C 1Q 2.5Q 3.5Q
30 1C 1C 1C 1C 2C 4C 1.5Q 2Q 4Q 5Q
40 1C 1C 1C 2C 2C 1Q 2Q 2.5Q 4.5Q 7Q
60 1C 1C 2C 3C 4C 2Q 3Q 4Q
80 1C 1C 2C 4C 1Q 2Q 3.5Q 5Q
100 1C 2C 3C 1Q 1.5Q 2.5Q 4Q 6Q
150 2C 2C 4C 2Q 2.5Q 4Q 6Q 2.5G


Table 1b. Quantities of calcium hypochlorite (70% chlorine) required for water well disinfection.
Well Diameter (in.)
Depth of
water in
well (ft) 		2 3 4 5 6 8 10 12 16 20 24 28 32 36 42 48
5 1T 1T 1T 1T 1T 1T 2T 3T 5T 6T 3 oz. 4 oz. 5 oz. 7 oz. 9 oz. 12 oz.
10 1T 1T 1T 1T 1T 2T 3T 5T 8T 4 oz. 6 oz. 8 oz. 10 oz. 13 oz. 1.5 lb. 1.5 lb.
15 1T 1T 1T 1T 2T 3T 5T 8T 4 oz. 6 oz. 9 oz. 12 oz. 1 lb. 1.5 lb. 1.5 lb. 2 lb.
20 1T 1T 1T 2T 3T 4T 6T 3 oz. 5 oz. 8 oz.
30 1T 1T 2T 3T 4T 6T 3 oz. 4 oz. 8oz. 12 oz.
40 1T 1T 2T 4T 6T 8T 4 oz. 6 oz. 10 oz. 1 lb.
60 1T 2T 3T 5T 8T 4 oz. 6 oz. 9 oz.
80 1T 3T 4T 7T 9T 5 oz. 8 oz. 12 oz.
100 2T 3T 5T 8T 4 oz. 7 oz. 10 oz. 1 lb.
150 3T 5T 8T 4 oz. 6 oz. 10 oz. 1 lb. 1.5 lb.

Quantities are indicated as: C = cups; Q = quarts; G = gallons; T = tablespoons; oz. = ounces (by weight); lb = pounds

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Publication #: 356-487

Kathleen Parrott, Extension Specialist, Housing
Blake Ross, Extension Specialist, Agricultural Engineering
Janice Woodard, Retired Extension Specialist, Home Management and Equipment.

Disclaimer and Reproduction Information: Information in NASD does not represent NIOSH policy. Information included in NASD appears by permission of the author and/or copyright holder. More

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