Well Water Safety

Thursday, September 12, 2013

Residents with wells under standing water should assume the water is contaminated and follow boil water instructions.

  1. Use bottled water that has not been exposed to flood waters if it is available.
  2. If you don't have bottled water, you should boil water to make it safe. Boiling water will kill most types of disease-causing organisms that may be present.
    • If the water is cloudy, filter it through clean cloths or allow it to settle, and draw off the clear water for boiling.
    • Boil the water for one minute, let it cool, and store it in clean containers with covers.
  3. If you can't boil water, you can disinfect it using household bleach. Bleach will kill some, but not all, types of disease-causing organisms that may be in the water.
    • If the water is cloudy, filter it through clean cloths or allow it to settle, and draw off the clear water for disinfection.
    • Add 1/8 teaspoon (or 8 drops) of regular, unscented, liquid household bleach per each gallon of water. Stir it well and let it stand for at least 30 minutes before you use it.
    • Store disinfected water in clean containers with covers.
  4. If you have a well that has been flooded, the water should be tested and disinfected after flood waters recede. If you suspect that your well may be contaminated, contact your local or state health department or agriculture extension agent for specific advice.


Chana Goussetis
Marketing and Communications Specialist
Boulder County Public Health
cgoussetis@bouldercounty.org
303-441-1457


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