Bleach – Water Ratio For Drinking Water

If your water source is uncertain, you should treat it first before drinking it.
One way to treat water for drinking is to add a small amount of regular bleach (chlorine). Here’s how much bleach to add, and a way to remember the quantity:


When obtaining water to be purified for drinking, avoid (if possible) water which is cloudy. Perhaps there is another nearby access to the same body of water which may be clear.
If scooping water from a pond, etc., try not to disturb the bottom so as not to disturb and pick up dirt or other debris into your water container.
If the water appears cloudy, if possible filter it before treatment. Use a conventional water filter, or any cloth or such filtering material to catch the floating particles as you pour from one water vessel to another. If you cannot pre-filter a cloudy water source, let it settle in a container for a time, and then gently pour off or scoop the water near the top which will be clearer. This is important because the floating ‘dirt’ particles within the water are tougher (takes longer) to penetrate while purifying with chlorine (bleach).
 

Having said that, one best way to purify water for drinking is to boil it for 1 minute.
Once the water has reached a rolling boil, it has become safe to drink.

Note that if the water source had been contaminated with chemicals, boiling it or otherwise treating it will NOT assure that the chemical is removed.
Know your water source as best you can.

 

Another way to purify water is to use a small amount of regular liquid bleach.
Use regular household bleach, which the only active ingredient is ‘sodium hypochlorite’.
UPDATE: For many years, regular bleach contained a concentration of 5.25% – 6% sodium hypochlorite. Newer ‘regular’ liquid bleach may contain a concentration of approximately 8% sodium hypochlorite (about a third more than the original bleach formula). However the added concentration is still very well within the safety margin for normal drinking water treatment via the original recommendation of 8 drops (bleach) per gallon of water to be treated – given that the maximum allowable ppm (parts per million) of chlorine bleach in drinking water is apparently 4 ppm (sourced from the EPA). In other words, if you use ‘modern’ bleach (~8% sodium hypochlorite) and use the original bleach-water formula (designed around ~6% sodium hypochlorite), the safety margin is so wide for water which has not been treated yet – that it’s hardly worth adjusting the formula, in my opinion. In other words, the equivalent of an extra 2 drops bleach within one gallon of water is fairly insignificant when it comes to the scenario here of purifying water to drink during an excursion or disaster situation, etc.. (the results of which could become deadly if you had not purified the water). Make sense? Just saying…
Note that bleach will lose its potency (fairly quickly) over time. Generally, 6 months to a year after its expiration date may result in half strength.

Having recently determined how much bleach to add to a 50-gallon water tank to purify it for safe drinking, I’ve put together the following chart for your reference.

“You must be 21 to drink”
2 drops bleach per 1 quart water

Mix the following amount of bleach with water, and wait 30 minutes for it to work.
(quantities are rounded for convenience and easier to remember)
 

Water – Bleach Ratio For Purifying Drinking Water

(Teaspoon #’s are safely rounded for convenience)
1 Quart water, 2 drops bleach
1 Gallon water, 8 drops bleach
5 Gallons water, 1/2 teaspoon bleach
10 Gallons water, 1 teaspoon bleach
50 Gallons water, 5 teaspoons bleach

Note: If the water is cloudy, you may double the formula listed below per recommendations from the CDC (Centers for Disease Control).

Note: There are 76 drops per teaspoon.

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