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Water quality in wells and boreholes changes and they are potentially vulnerable to intermittent fecal contamination.

Here’s how:

  • Fluctuations due to rainfall and rainfall runoff into source waters and groundwater
  • Contaminated surface water and/or groundwater enters improperly constructed well
  • Presence of animals where there are no barriers at well or borehole to protect against animal fecal contamination
  • Poor sanitary protection at the top of the borehole, no sanitary seal or well apron
  • Hand pump base doesn’t have a watertight seal where it attaches to the casing
  • Contamination at the well pump outlet (spout) from contaminated hands
  • Casing doesn’t extend far enough above the ground and surface water can enter well, defective well casing and/or liner
  • Contaminated objects fall into well
  • Shallow, open wells are more susceptible to contamination
  • Intermittent septic system intrusion and/or other transient fecal source

Here are other helpful resources on water quality monitoring.

Do you have questions about water quality testing? Contact us!