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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 2
A level 2 assessment is triggered by:
- An E. coli MCL violation.
- A second level 1 trigger within a rolling 12-month period.