What Your Results Mean—and What to Do Next
Total Coliform testing is a cornerstone of drinking water compliance in Texas and across the U.S. It serves as a primary indicator of potential contamination within water distribution systems.
What Are Total Coliforms?
Total coliforms are a group of bacteria commonly found in soil, vegetation, and surface water. While most are not harmful, their presence in drinking water may indicate:
- Pathways for contamination
- Distribution system vulnerabilities
- Treatment or disinfection issues
Regulatory Requirements in Texas
Public water systems in Texas must comply with the Total Coliform Rule (TCR), enforced by the Texas Commission on Environmental Quality (TCEQ). Requirements include:
- Routine sampling schedules
- Repeat sampling following a positive result
- Corrective actions when necessary
A positive Total Coliform result does not automatically mean water is unsafe, but it does require immediate follow-up.
What a Positive Result Means
When Total Coliforms are detected:
- Additional samples must be collected promptly
- Results are evaluated alongside E. coli testing
- System assessments may be required to identify the source
Timely response is critical to maintaining compliance and public confidence.
How A&B Labs Helps
A&B Labs supports Texas water systems with:
- Accredited Total Coliform & E. coli testing
- Clear reporting aligned with TCEQ requirements
- Reliable turnaround times for compliance decisions
Our goal is to help clients move from results to resolution with confidence.