73,428 samples from 1707 food establishments were analyzed during seven years.
Microbial profile of three types of food contact surfaces was observed.
HACCP improves process hygiene in all types of food establishments.
HACCP achieved reduction of at least 0.7 log10 CFU/cm2 for food contact surfaces.
HACCP achieved reduction of over 1 log10 CFU/cm2 for cooling facilities.