Water Sampling

Who is responsible for water sampling?

According to The Control of Substances Hazardous to Health (COSHH) Regulations 2002, it is essential for an employer or landlord to identify hazardous substances in the workplace and the different ways they can present a risk to the health of individuals on their premises.

Water sampling

Landlords and employers are obliged to show consistent evidence of compliance with relevant regulations and actively monitor the water systems on their premises for hazardous bacteria. Water sampling allows you to confirm or rule out contamination – crucial for keeping the water on your premises safe and bacteria-free.

Legionella Risk Assessment

Employers must clearly meet the health and safety standards, established by government agencies such as the Health and Safety Executive (HSE) and Care Quality Commission (CQC), to ensure they are not breaking water safety regulations. This often includes the monitoring of water systems on your premises for the presence of bacteria such as legionella, which occurs commonly in natural and artificial water systems.

Conducting water sampling for legionella water testing ensures you are abiding by industry standards. As risk assessment specialists, we at Bison Assist offer a full service to ensure that you meet water quality regulations – taking away your compliance and legislation worry by adequately sampling your water system and using only UKAS accredited laboratories to complete the legionella testing.

The legislation

The legislation and guidelines you must meet to ensure water related CQC standards are:

  • Management of Health and Safety at Work 1999
  • The Water Act 2003 (Consequential and Supplementary Provisions) Regulations 2005
  • Control of Substances Hazardous to Health Regulations 2002
  • Health and Safety at Work Act 1974
  • Health and Social Care Act 2012
  • The Water Supply (Water Quality) Regulations 2000
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Why choose Bison Assist?

At Bison Assist, we ensure that we are always in line with the ever-changing Health and Safety regulations. As a company that started out as a legionella specialist, we have developed a comprehensive system to offer an easy and inexpensive screening system for legionella, pseudomonas, and other life-threatening bacteria.

Registered with the Legionella Control Association, we offer our expertise through our highly qualified risk assessors who take water samples on-site in line with the latest guidelines and send test results to UKAS-accredited laboratories within hours to ensure the accuracy of results.

Water sampling survey specialists

At Bison Assist we are one of the leading Legionella testing companies in the UK. We invest in our staff to guarantee our health and safety consultants are trained to the highest level. With nationwide reach, our expert team can complete multiple risk assessments on-site during a single visit. This ensures our customers have the minimum level of disruption, saving both time and money.

Our expertise and consistent delivery of exceptional service have granted us the trust of a nationwide customer base. Our commitment to providing quality service with competitive price points is what sets us apart. After our visit, we’re still here to help – the Bison team is on hand with phone support to answer any questions you have.

Join our ever-growing Bison herd and benefit from our unbeatable multi-service discounts and excellent customer service!

Not sure if we can help you? Give us a call! Our partner laboratory can do multiple tests and we can speak with them in your behalf, taking your hassle away!


How do you test for legionella in water?

During Pseudomonas Aeruginosa and legionella water testing, a trained specialist measures samples from taps and outlets. Personal protective equipment (PPE) is worn, and sample containers are sterilised to ensure an accurate measurement is taken where no contamination of the samples has occurred.

Water Sampling

Samples can be taken from taps or outlets. There are various methods and customer requirements, but we can take the first sample immediately, without any disinfection or flushing of the tap and without the tap having been used for several hours. Temperature measurements are also taken, and the sample of water is mixed with a biocide‑neutralizing agent in a container. The collection method is then repeated to take a second sample after the tap has been flushed, disinfected in-line with site health and safety requirements, and the temperature is stable.

Disinfection involves removing any fittings and using a flexible plastic Pasteur pipette, wash bottle, or other appropriate means to inject disinfectant inside the nozzle of the tap until it runs out. Two minutes should be allowed for the disinfectant process to take place. All of this must be done while wearing protective goggles.

After sampling, the containers are then labelled with unique identifiers and testing details such as date, time, and location of the sample site. They’re then kept at ambient temperatures and protected from sunlight while they’re transported for storage and analysis. For legionella water testing and the measurement of other bacteria, samples are tested within 48 hours for accurate analysis.

Samples will show if bacteria are at safe levels and comparisons between samples can indicate if there are any potential sources of contamination. If the levels of bacteria are considerably higher in the pre-flush sample compared to the post-flush sample, this suggests that there is a source of contamination near the outlet. If higher counts occur in specific outlets but not others, this also indicates that contamination is around specific outlets. If the samples suggest that circulating water is contaminated, further testing will help identify the source of the systemic problem.

More legionella services

Legionella Risk Assessments

Water sampling is often carried out in conjunction with a full Legionella Risk Assessment – another legal requirement. Find out more about your responsibilities under Legionella legislation.


Multi-Service Discount

Our highly qualified risk assessment specialists can carry out multiple services such as Health & Safety, Fire Risk Assessments, Legionella Risk Assessments, Legionella Testing, and more – all in one visit, with a multi-service discount.