The Total Coliform Rule became effective December 31, 1990. This rule established microbiological standards and monitoring requirements which apply to all Community and Non-community water systems.
The presence of total coliform bacteria indicates the possible presence of fecal and disease-causing bacteria. Enforceable standards are set for total and fecal coliforms.
| Coliform MCLs | |
|---|---|
| # of Routine Samples/Month | Limits for Total Coliform Positive Samples Each Month |
| Less than 40/month | No more than one sample |
| 40/month or more | No more than five percent of all monthly samples |
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