Water can also be disinfected with chlorine, bromine, iodine, or ozone. Chlorine oxidizes iron and manganese so they can be filtered out. Yet, high concentrations of chlorine give water a bad taste. They may combine with other components to form cancer-causing compounds. Ozone may be used to disinfect public water supplies, but is rarely used for private supplies.
Chlorine is used most often to disinfect private wells.
A well may be contaminated when flooded or when the watertight casing is no longer intact. It may be contaminated when opened for maintenance or repair. Homeowners can chlorinate wells themselves or hire professionals. If you hire professionals, make sure they are licensed contractors. If you disinfect your well, calculate how much chlorine you need.