Term Identity
What the term means in an annual report
Total coliform describes a broad indicator group used to identify when a system needs assessment or corrective follow-up.
Why it may appear
The Revised Total Coliform Rule uses total-coliform monitoring to identify possible treatment or distribution-system problems that require assessment.
How it may be printed
Reports may list total coliform results, routine testing counts, assessment information, corrective actions, or a status field exactly as printed.
- Other names you may see
- Total coliform; Total coliforms
- Common report labels
- Total coliform; Total coliforms; Routine samples
Evidence
Official sources for this explainer
Use official federal, state, utility, or report sources before treating a page as final.
- Supports
- Indicator role; Assessment treatment technique; E. coli distinction
- Retrieved
- 2026-07-11
- Reviewed
- 2026-07-11
- Supports
- CCR microbial reporting context; Report-period presentation
- Retrieved
- 2026-07-11
- Reviewed
- 2026-07-11
- Supports
- Annual-report purpose and reporting context; Report-period interpretation and official next steps
- Retrieved
- 2026-07-11
- Reviewed
- 2026-07-11
Regulatory Context
How to read the applicable rule language
Use this Total coliform context to read a report's printed fields; it does not replace the report or the current official rule.
Framework
Under the current Revised Total Coliform Rule, recurring total-coliform findings can trigger assessments and corrective action under a treatment technique. E. coli has a separate MCL. Older report columns must not be presented as a current rule summary merely because they are preserved as printed.
Limit or program terms
- Treatment technique
- Assessment
- E. coli MCL
Units and source context
Microbial rows may use sample counts, presence or absence, or report-defined abbreviations rather than a concentration unit.
What this page does not duplicate
An MCL, MCLG, or ND cell printed in the report is preserved as report evidence. It does not replace the current EPA Revised Total Coliform Rule explanation.
No standalone numeric limit table is rendered here. Read the source report's printed criterion and the current official source together.
Interpretation Boundaries
What a listed result does not establish
These Total coliform boundaries apply to every report row connected to this explainer.
Household-level boundary
A report-period system indicator does not establish current microbial conditions at a particular tap.
What to verify next
Continue Reading
Related explainers and report-reading guides
Read about topics related to Total coliform, or use a guide to understand the report as a whole.
How to read a water quality report
A plain-English walkthrough of Consumer Confidence Reports, including report years, detected contaminants, legal limits, violations, and source notes.
View How to read a water quality reportDetection vs. violation vs. advisory
A careful guide to three different water-record terms, what each one can mean, and what official source to check next.
View Detection vs. violation vs. advisoryWhat public water data can and cannot tell you
What official public water records can help you check, what they cannot prove, and why missing data needs cautious interpretation.
View What public water data can and cannot tell you