How long can a water sample be held before it is analyzed?

The holding time is specified by the authority governing the water sampling process for the site. The holding time is the maximum amount of time a sample can be held before analysis and still be considered a valid sample. If a sample exceeds the holding time, it is considered suspect, and the sample collection may have to be repeated.

Typically, water samples have a maximum holding time that ranges anywhere from six hours to six months. Some attributes, however, require immediate analysis, such as the following:

  • Dissolved oxygen
  • pH
  • Sulfite
  • Temperature
  • Total residual chlorine

This was helpful

FAQs Home