Shock chlorination is a disinfection treatment recommended when a domestic drinking water system is contaminated with bacteria.
Contamination can occur when the well is installed or when repairs are made to the pump or plumbing.
Shock chlorination should take care of contamination that is introduced during these activities. If the groundwater itself is the source of bacteria, the system will be contaminated again when that water is pumped into the plumbing. In that case, continuous chlorination or other disinfection methods will be necessary to ensure the safety of the water supply. Shock chlorination introduces very high levels of chlorine into a water system. During the disinfection process, water from the system is not suitable for consumption or extended contact by people or animals.