The limit of detection (LOD) 

Potable water

    0.5-5 CFU/mL

    0.05 CFU/mL if concentrating a full liter of potable water

    0.5-5 CFU/mL for Hot Water Tanks

     10 CFU/swab for Swabs.

Non Potable water (Cooling Towers) 

    5 CFU/mL