Water Well Chlorination

Well Water Chlorination

Chrlorination Information

Aqua recommends well chlorination as the first step in trying to remedy an unsafe sample, high iron, iron bacteria, hydrogen sulfide & anytime the well is entered for service.

Chlorination Instructions

 Warning: It is recommended a licensed pump installer chlorinate water wells. Do not attempt if the pump or piping is connected to the well cap or if you have a flowing well or pressurized well head. Calcium hypochlorite is a hazardous material and can cause severe injury, it is extremely important to handle with caution & care. Chlorinating wells in most instances, is an effective means of disinfecting a well. Under certain conditions, obstructions, corrosion & pump failure can occur in the well & plumbing system.

Example Calculation

Well ChlorinationWell Information

Well casing diameter= 6 in
Well depth= 200 ft
Depth to water from surface= 75 ft


Standing water in well=125 ft (200′ – 75′)
125′ x 1.50 gallons= 187.50 gals per Table A
187.5 gals./100= 1.87 x .66 =1.23lbs Table B
187.5 gals./100=1.87 x 3.6 = 6.73qts Table B

1.23 lbs Granular or 6.73 qts Liquid bleach
will be needed to chlorinate your well

Gallons of Water in Your Well

2” diameter:  .17 gals.     Per foot
4” diameter:  .66 gals.    Per foot
6” diameter:  1.50 gals.  Per foot
5” diameter:  1.04 gals.  Per foot
8” diameter:  2.60 gals. Per foot

Amount of chlorine needed for a 500 mg/l solution per 100 gallons of water.

Sodium Hypochlorite Household Bleach
(5% available chlorine)
3.6 quarts
Approx 1 gallon

Calcium Hypochlorite Tablets/Granular
(70% available chlorine)
.66 pounds
Approx 10 ounces

Call Aqua Well & Pump at 1 (800) 452-6060 today to schedule your well chlorination or to get answers to all of your questions. Visit our Services page to see how we can help with all of your well and pump needs.

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