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Assessments

Assessments

Level 1 assessments are performed by the water supply owner or operator to find and fix sanitary defects that can cause contamination. Level 2 assessments are more comprehensive and are performed by EGLE staff. Assessments are required when treatment technique triggers occur.

Level 1

A level 1 assessment is triggered by:

  • For supplies collecting 40 samples per month or more; >5% of routine and repeat samples in a month are total coliform-positive.
  • For supplies collecting fewer than 40 samples per month; 2 or more routine and repeat samples in a month are total coliform-positive.
  • The supply fails to take every repeat sample after a total coliform routine sample.

The water supply must complete the Level 1 Assessment form within 30 days.

Level 1 assessment form

Level 2

A level 2 assessment is triggered by:

  • An E. coli MCL violation.
  • A second level 1 trigger within a rolling 12-month period.