A standard treatment for sanitizing your well water is shock
chlorination. Listed below are guidelines for using this treatment
safely and effectively.
THE UNIVERSITY OF GEORGIA
COOPERATIVE EXTENSION SERVICE
JORGE H. ATILES
PAUL F. VENDRELL
WHAT IS SHOCK CHLORINATION?
Shock chlorination is the process by which wells are sanitized with chlorine. Shock
chlorination is the most widely recommended means of treating bacterial contami-
nation in home water systems such as wells, springs, and cisterns.
WHEN SHOULD SHOCK CHLORINATION BE USED?
Shock chlorination is recommended following any construction, installation, main-
tenance, or repair of wells and other water systems. Shock chlorination is essential
if there has been flooding or other obvious means of contamination in your
area. It is NOT a recommended method for treating recurring bacteria
WHAT PRECAUTIONS SHOULD BE TAKEN PRIOR
TO SHOCK CHLORINATION?
Make sure that everyone in your home is warned not to use the water dur-
ing the treatment process. Arranging for an alternative source of drinking
water is a necessity, especially if the solution is in the system overnight.
Special care should be taken to ensure that children and older adults do not
consume tap water during the treatment process.
WHAT KIND OF CHLORINE SHOULD BE USED?
Regular household chlorine bleach found in supermarkets and supply stores
is suitable for this process. Use only the plain (and generally least expen-
sive) kind of bleach; do NOT buy fresh scent, lemon, or other scented chlo-
THE SHOCK CHLORINATION PROCESS
1. CLEAN: Remove all loose or foreign debris from the wellhouse, spring
house, or storage tank. Then scrub accessible interior surface with
strong chlorine solution (1/2 gallon chlorine bleach per 5 gallons clean
2. CALCULATE & POUR: Pour 3 pints of chlorine bleach per 100
gallons of water into your well. To determine the amount of standing
water in the w