Environmental testing and plant hygiene monitoring

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

Swab testing for bacteria, yeasts and moulds

Swab testing for specific micro-organisms


  • Enterobacteriaceae
  • coliforms/E coli
  • Pseudomonas sp
  • presumptive Listeria

Hand and clothing swabs

Exposure plates for air monitoring

Bacterial Identification

Water analysis

What you can expect from DLL when supporting your environmental 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 (see under Consultancy and Technical).
  • provision of swabs for hard surface sampling and plates for air sampling, if required.


Test Turnaround (days) Price/sample
Swab testing for total bacteria, yeasts and moulds 5 £3.25
Swab testing for specific micro-organisms – enterobacteriaceae, coliforms, E coli & pseudomonas 2/3 £3.00
Swab testing for presumptive Listeria 3 £5.00
Hand swabs (bacteria + S aureus) 2 £5.00
Exposure plates 5 £3.50
Bacterial identification 15 (max) From £25 / isolate
Water analysis:
Total viable count at 22 & 37°C 3 £6.00
Absence of specific micro-organisms in 100ml 1/2 £7.00 / organism
Absence of specific organisms in 1ml 2 £5.50 / organism
pH 1 £10.00
Conductivity 1 £10.00

To avoid delays please ensure that:

  • samples are suitably packaged to avoid damage in transit
  • swabs, plates and water samples are forwarded to us as quickly as possible i.e. receipt by DLL within 24h

All prices exclude VAT