How do we avoid cross-contamination?

Saskia Prestidge 
May 22, 2021

 Presco Environmental technician, Kenan, safely breaching a makeshift redline.

As a contractor visiting multiple sites, we are acutely aware of the risk of cross-contamination we could pose to you.  We realise how easy it would be to transfer pathogens from one site to another: between meat and dairy processors for example.  The consequences would be devastating.  

That is why we take the utmost care to honour our hygiene controls.  

Our understanding of food safety and quality controls help us identify the cross-contamination risk and mitigate any likelihood of it occurring.    

Cross-contamination more often occurs between hygiene zones at one site.  Therefore, it is vital we understand the different hygiene zones and controls at each access point for the site.  

Some of the mitigation and elimination controls we have in place:

  • We can provide contract tracing for any site that any of our technicians have worked on going back 7 years.  Therefore, we know every site that all of our technicians have visited prior to coming to your plant, if there is ever a need to trace this back.
  • We do not work with human or animal effluent/septic waste.  If it is required as part of a service package we provide, we sub-contract this out.
  • We ensure all our technicians have current site inductions for the sites they are working on.
  • Our brush ware is all hygiene zone rated.
  • All our equipment is cleaned and sanitised on completion of the day’s work, either at the site or back in our yard. 
  • We have a dehumidifying room for drying cleaned equipment over night.
  • All cleaning consumables used, such as scourer pads, cloths, and PPE, are bagged and disposed of daily.
  • Any overalls, microfibre mops or microfibre cloths are laundered in our own segregated commercial washing machines at ≥60°C before being reused.  
  • Hoses that could pick up contamination are sheathed in plastic before being bought into a critical hygiene environment.
  • All equipment is checked for cleanliness and sanitised on the way into a critical hygiene plant.
  • Any cracked or damaged equipment is replaced.
  • Where the level of risk dictates it, or our service is very frequent, we assign permanent cleaning equipment to the plant and leave it onsite.


Have a specific question about cross contamination?  Contact us at