Contamination is not likely to be of sewage origin unless far removed from the water source or unless there has been a delay in receipt of sample. Common with new wells before disinfection and shallow dug wells which are not properly sealed. This condition frequently occurs with new wells, dug wells receiving soil drainage, or wells which have been idle for some time. Disinfection Use chlorine to kill bacteria in your well, pump and distribution system. Chlorine has a shelf life of six months, so be sure to use fresh bleach.
Continuous chlorination adds low levels of chlorine to a water supply.
Visit Water Purification and Treatment . If possible, agitate or mix the water in the well by using a clean hose to pump the chlorinated water back into the well, and flushing down the well casing and water lines above the water level. After adding chlorine to the well, remove or bypass any carbon filters that are in the system for water treatment. These filters will remove the chlorine from the water, and any pipes beyond the filter will not be disinfected. Put in a new filter after chlorination to avoid reintroducing bacteria into the system.