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PUBLIC HEARING NOTICE - September 22, 2003, Disinfection Procedure for Private Drinking Water Wells


If the well was flooded and under water, the well water should not be consumed until bacteriological testing indicates the well has not been contaminated.


If you are not sure the well was flooded, you should assume that it was contaminated and use another water source until the safety of the well is confirmed. Bottled water, boiled water or water that has been disinfected should be used for drinking, brushing teeth, cooking or preparing foods, etc.


If the water from the well is discolored (i.e., muddy or cloudy), run the water off using a water hose until the water is relatively clear. Once the water has cleared, run the water through the homes plumbing system to flush out any contaminated water.


  1. It is strongly recommended that you contact a well driller if possible to disinfect the well.
  2. Measure out proper quantity of unscented household bleach (Clorox) following the Chlorination Dosage Rate Chart.
  3. Turn power off to well.
  4. Remove well cap. If well head has a sanitary well seal, then remove the vent screen or plug. Use extreme caution to avoid dropping anything into well.
  5. Mix the proper amount of household bleach with water in a clean bucket. Pour the mixture around the inside of the well casing.
  6. Recap the well head.
  7. Turn power to the well on.
  8. Run water cold and hot to all fixtures in the dwelling or building until there is a detectable bleach smell. Start with the fixture that is furthest from the well pressure tank.
  9. Let the disinfected water stand in the plumbing for 24 hrs. if possible.
  10. Flush system through a hose attached to an outside spigot to prevent damage to your septic system.
  11. Have a water sample taken and tested for coliform bacteria through a certified laboratory.
Casing Diameter
in Inches
Volume of water
per 100 Feet (Gallons)
(5% chlorine)
4 ounces
18 ounces
40 ounces
4.25 pints
4.67 gallons
7.3 gallons
10.5 gallons


Typically use 2–3 cups of unscented household bleach for a drilled well 4 inches in diameter.


Typically use 3 quarts of unscented household bleach per 10 feet of water in a 30-inch bored well.


Contact information: Williamsburg Area Office - Peninsula Health District – (757) 253-4813.



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