Bacteria and Other Microorganisms in Household Water

Authors: Kathleen Parrott, Extension Specialist, Housing, Virginia Tech; Blake Ross, Extension Specialist, Biological Systems Engineering, Virginia Tech; and Janice Woodard, Retired Extension Specialist, Home Management and Equipment, Virginia Tech.

Publication Number 356-487, posted April 1998

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

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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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