What is a TNTC test result?

TNTC stands for “too numerous to count” which means the bacteria levels are above 90,000 colony-forming units (CFUs). This number is measured through laboratory testing through both FLO and R2A testing methods and means the sample reached a high failure level.  

Failures that reach TNTC are caused by a high concentration of bacteria in water samples. Don’t worry though, you can take immediate action to rectify the situation and shock your lines.

Shocking is the process of running a strong chemical (like diluted bleach, or Liquid Ultra) through your waterlines to eliminate biofilm and bacteria.

For more information on shocking your lines, check out our guide and video on How to Shock or contact our safe water team directly at 888-843-3343.