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Environmental Testing & Plant Hygiene Monitoring

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Manufacturing under hygienic conditions is essential to avoid microbiological problems and ensuring that products consistently meet required quality standards. DLL offers the following testing to support routine plant hygiene monitoring, and the investigation of microbiological issues:

In house methods based on ISO 18593 covered by our CLAS scope:

  • Swab testing for bacteria, yeasts and moulds
  • Swab testing for specific micro-organisms, e.g.
    • Enterobacteriaceae
    • Coliforms/E coli
    • Pseudomonas spp
    • Staphylococcus aureus
    • Presumptive Salmonella spp
    • Presumptive Listeria
  • Hand and clothing swabs
  • Exposure plates for air monitoring
    • This will consist of sending you sets of pre-poured plates - 2 per location: 1 plate for bacteria and 1 plate for yeast & moulds.
    • These plates will need to be exposed for 60 minutes then returned to us for reading and interpretation.
    • We apply pharmaceutical Class D limits for non-sterile manufacture or, we can apply any specification you require.
  • Bacterial identification
  • Water analysis
How we can support your testing and plant hygiene monitoring programmes:
  • Basic characterisation of predominant recovery at no additional charge.
  • Full identification of predominant contaminants, if required.
  • Advice on monitoring regimes and cleaning/sanitisation procedures.
  • Help with interpreting the significance of results and suggesting appropriate corrective action.
  • On-site assistance with contamination problems.
  • Provision of swabs for hard surface sampling and plates for air sampling, if required.
test tubes


Unit 3
Donnington Park
Birdham Road
West Sussex
PO20 7DU

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