How To Disinfect A Well
Use bleach to disinfect. Follow the instructions below for
dug or drilled wells to determine how much bleach to use.
If you know how much water is in your well, add bleach for
that amount of water. If you don't know, add bleach amount
for the depth of your well.
Dug Wells
Make a solution of bleach water using the amounts of bleach
and water shown below. Pour bleach in 10 gallons of water.
Mix thoroughly. Splash on casing inside well. Seal top. Open
faucet. Let run until you can smell bleach at the faucet.
Close faucets. Let set overnight. Next day, open faucets.
Let water run slowly until bleach smell is gone. Add bleach
as follows:
Diameter of well Add bleach
is 4 ft. 3 cups per ft. of water
is 6 ft. 6 cups per ft. of water
is 8 ft. 12 cups per ft. water
Example
If a well has a diameter of 6 feet, is 15 feet deep, and
has 5 feet of water in it, add 30 cups of bleach. (6 cups
x 5 feet of water).
Drilled Wells
Make a solution of bleach water using the amounts of bleach
and water shown below. Remove the well seal. Pour the bleach
solution into the well. Connect hose and spray inside of well
casing for 15 minutes. Turn on water taps in house. Let it
run until you can smell bleach at faucets. Turn water off.
Let stand overnight. Next day, open faucets. Let water run
slowly until bleach smell is gone.
To Make Bleach Solution
Find out how many gallons of water are in your well. For
every 100 gallons of water in your well, add a mixture of:
3 cups bleach in 10 gallons of water.
If well diameter is It holds this much water
6 inches 1.5 gallons water per foot
8 inches 2.5 gallons water per foot
10 inches 4 gallons water per foot
12 inches 6 gallons of water per foot
If well has Add/Mix
150 gal. water 4.5 cups bleach in 15 gal. water
50 gal. water 1.5 cups bleach in 5 gal. water
For Safety
After you disinfect your well, have a sample of your tap
water tested at your local health department. Before you drink
the water, make sure 2 samples are rated satisfactory, to
ensure it is safe and free of contamination.
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