Contaminant guide
Total coliform / E. coli
Coliform bacteria are indicators. Their presence can signal a pathway for disease-causing microbes. E. coli in drinking water is an acute health concern.
Health context
E. coli indicates fecal contamination and can cause serious gastrointestinal illness.
EPA standard notes
Under the Revised Total Coliform Rule, E. coli has an MCL goal of zero; assessments and corrective action are required when triggered.
Standards and rules change—confirm on epa.gov/sdwa.
What you can do
- Follow any boil-water notice from your utility immediately.
- Private well owners should shock-chlorinate and retest after positive results.
FAQ
Is a filter required?
Not automatically. Many systems meet standards without point-of-use filters. Filters can be useful for taste, specific contaminants, or home plumbing issues—match certifications to the problem.
Where should I verify numbers?
Your utility’s Consumer Confidence Report, public notices, TCEQ resources, and EPA ECHO/SDWIS records.