Best Practices for Flooded Water Well Disinfection Published

NGWA develops industry best suggested practice for water well system professionals

NGWA Residential Water Well Disinfection Following a Flood BSP

The National Ground Water Assn. (NGWA) has developed an industry best suggested practice (BSP) for water well system professionals to use regarding the emergency disinfection of flooded residential water wells.

The BSP, "Residential Water Well Disinfection Following a Flood":

  • Provides general requirements for emergency well disinfection;
  • Details specific steps for disinfection, depending on the well’s configuration; and
  • Discusses proper disinfection follow-up procedures.

Variables noted in the BSP that can influence proper well disinfection procedures include, but are not limited to, local geologic conditions and a well’s design, dimensions and condition.

NGWA’s recommendations address two classifications of private water wells: wells that are not generally at risk based on their construction and maintenance, and wells that are at risk due to construction deficiencies and/or lack of maintenance that compromise the integrity of the well.

Steps involved in emergency well disinfection, as outlined in the BSP, include:

  • Inspection of the flooded well for the presence of organic matter;
  • Well flushing and/or cleaning;
  • The proper mix, contact time and distribution of well disinfection agents; and
  • Water testing intervals.

Residential Water Well Disinfection Following a Flood was developed by a work group of NGWA member professionals drawing from extensive experience and referenced research. Available as a PDF, it can be downloaded. While free to NGWA members, there is a nominal charge to nonmembers.


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