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Disinfecting Your Well
Image used by permission of the
County Health Department, Washington State
This procedure is designed for the
typical four-inch diameter well with a submersible pump. If you have an
above-ground jet pump with a closed system, you will need to contact a well
driller to disinfect the system.
Shut off power to pump
and drain water from the pressure tank, all tanks in the system, and all
water lines, including indoor water lines at faucets.
Obtain one of the following:
Two to three (2 to 3) pounds of calcium
hypochlorite. This may be purchased anywhere pool chemicals are
sold. This is the best type to use. You will need to mix
this dry chlorine powder with approximately five gallons of water.
Four (4) gallons of liquid pool
chlorine (10 percent solution of sodium hypochlorite).
The bigger your water
distribution system, the more chlorine solution you will need for
Remove one-half inch
(1/2")access plug from
top of casing (see diagram above) and pour chlorine solution into well through opening.
Follow with two gallons of plain water. Replace plug.
Turn power on, start pump, and fill
the pressure tank. Open all faucets, one at a time, until bleach
odor of the chlorine is recognized, then close spigots.
Do not use any water from the
system for ten to 12 hours - water will
have a high concentration of chlorine and may irritate sensitive tissues. Allow power to remain on to maintain pressure in tank.
After ten to 12 hours, thoroughly
drain and flush all lines and pressure tank, allowing water to run from
faucets until no odor of chlorine bleach is present.
After another eight hours, samples
may be submitted to a laboratory for testing.
If you have any questions regarding the
above procedures, please contact the Columbia County Health Department,
Environmental Health Section at (386) 758-1058.
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Columbia County Health Department | 217 NE Franklin Street | Lake City, FL 32055 | (386) 758-1068
This page was last modified on: 05/7/2007 01:24:42