Stakeholder - ALS Environmental

Updated Health Technical Memorandum – HTM04-01

ALS-health-technical-memorandumALS Environmental would like to advise customers that The Department of Health (DH) has recently updated the Health Technical Memorandum (HTM) 04-01 which covers water safety in NHS properties, including the sampling and analysis of Legionella and Pseudomonas aeruginosa. ALS Environmental can support with compliance to the new guidance regarding the analysis of pathogens in water.

The updated guidance see’s the HTM04-01 split into 3 parts and 1 supplement:

HTM 04-01 Part A

design, installation and commissioning

HTM 04-01 Part B

operational management

HTM 04-01 Part C

Pseudomonas aeruginosa – advice for augmented care units

HTM 04-01 Supplement

performance specification D 08 – thermostatic mixing valves (healthcare premises)

Each section emphasises the importance of the use of Water Safety Groups (WSGs) and Water Safety Plans (WSPs) towards the management of water systems. The role of the WSGs and WSPs is to minimise the risks to health from various sources including clinical risks, changes to the water system, resilience of the water supply and microbial and chemical contamination. ALS Environmental can provide a breadth of chemical and microbiological testing from our laboratories in Coventry and Wakefield.

The updated guidance encourages a stronger emphasis on staff competencies and the implementation of water hygiene awareness training. The DoH document has been written to promote good practice for those responsible for the design, installation, commissioning, maintenance, testing, monitoring and operation of water supply systems in healthcare premises.

health-memorandum-ALSThe 2016 edition of HTM 04-01 provides thorough and comprehensive guidance on measures to control waterborne pathogens such as Pseudomonas aeruginosa Stenotrophomonas maltophilia, Mycobacteria as well as Legionella. ALS Environmental are able to support with instant and informative MALDI-ToF confirmations for all of these pathogens.

Click here to read our paper on the ESKAPES pathogens.

The updates to HTM 04-01 have been made to align with the updated Approved Code of Practice for Legionella (L8) and its associated HSG274 guidance documents which were published by the Health and Safety Executive (HSE) in 2015.

The Addendum to HTM 04-01 published in 2013 which is now in Part C, following the Pseudomonas aeruginosa outbreak in Belfast, introduced the concept of WSGs and WSPs. Part B of the HTM now includes updated guidance on the remit and aims of the WSG and WSP.

Guidance on sampling techniques for, testing for, and the microbiological examination of Pseudomonas aeruginosa samples – originally in the HTM 04-01 Addendum – is now included in Part B to compliment similar guidance on Legionella. It should be read in conjunction with the HSE’s Approved Code of Practice (L8) and HSG274 Part 2. It is equally applicable to both new and existing sites.

For further information on ALS Environmental’s Legionella and Microbiology offering, to request a quote or for any other enquiry, please contact us or call us on 02476 421 213.

Contact Us

ALS Environmental

Torrington Avenue



T:  024 7642 1213

or :

Units 7 & 8

Hawarden Business Park

Manor Road








We had potential water quality problem due to the actions of a third party and needed samples taken as a matter of urgency. Although this was outside the strict terms of our contract with ALS they were able to provide a sampler on a Friday afternoon, get the samples taken and returned to their labs for analysis.

They backed this excellent performance up by emailing us the sample results over the weekend. All in all a great piece of customer service!

Bob Windmill, Head of Water Quality, Independent Water Networks

ALS are a really easy company to deal with their professional attitude to the range of services they provide for us is second to none. The people there listen carefully and respond very quickly to our requests , we have dealt with them for the last eight years and their customer advisors understand our business and not only their own.”

Ken Begg, Director, Aberdeen Sampling Ltd
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