|Procedure for Disinfecting Water Well|
Water in a recently drilled well is subject to contamination by the drilling operation and from pipe that conveys the water throughout the house. It is, therefore, necessary to disinfect the well to eliminate bacteria that may have been introduced into the system before the water may be used for drinking purposes. Follow up samples can determine whether or not the contamination of the well is an ongoing concern. Disinfection of old wells is also important when a sample proves positive for bacteria.
A disinfection procedure that may be used is as follows:
Caution should be used so that no one drinks water with large quantities of bleach.
This disinfection procedure should be performed prior to requesting a water sample for a new well or before requesting a resample after notification of bacteriological contamination.
This office issues permits for new water supply wells to Maryland licensed well drillers. If you need a new water supply well, contact a well driller. They will obtain the permit for your Certificate of Potability (COP), which are issued by Environmental Health Services for all new wells. Testing for a COP is required before a Use and Occupancy permit will be issued for dwellings by the county building permits office. We test the water for bacterial contamination and certain chemical parameters. Before scheduling the sampling for a COP, make sure the well has been disinfected either by the well driller or homeowner using the disinfection procedure. For more information, contact Environmental Health Services at 301-334-7760.
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