Microbiological Testing - Recreational Water Testing

Water quality is central to the safe operation and reputation of any recreational facility. Swimming pools, spas, hydrotherapy pools, and hot tubs must undergo regular microbiological testing to verify that disinfection systems are effective and water remains free from harmful bacteria.

Envirochem provides UKAS-accredited microbiological analysis (testing laboratory No. 1227) for recreational water systems, helping leisure operators, hotel groups, and facility managers maintain compliance and protect those who use their facilities. Integrating routine testing into maintenance schedules enables early detection of changes, prevents contamination incidents, and demonstrates due diligence to both regulators and guests.

What We Test

Recreational water systems provide ideal conditions for bacterial growth if water treatment or circulation is interrupted. Regular microbiological testing verifies that disinfection and filtration controls are operating effectively and that bacterial levels remain within acceptable limits.

Envirochem’s testing services include analysis for key indicator organisms such as:

Pseudomonas aeruginosa
Escherichia coli (E. coli) and coliform bacteria
Legionella species
Total viable bacterial count at 37 °C

Our testing is carried out in accordance with recognised standards and guidance, including HSG282, HSG179, and PWTAG. Results are clearly reported and interpreted against industry action levels to support effective maintenance and compliance.

Our Process

Every testing programme begins with a consultation to understand your facility’s layout, disinfection method, and existing control scheme.

Once samples are received, they are analysed in our UKAS-accredited laboratory (No. 1227) using validated culture-based and membrane filtration techniques. Results are issued promptly and accompanied by straightforward interpretation and recommendations for corrective action, if necessary.

For domestic spas, hot tubs, or small private pools where on-site attendance is not required, Envirochem also offers Legionella self-sampling kits through our online store, allowing you to safely collect samples and return them to us for testing and analysis.

When is Recreational Water Testing Required?

Regular microbiological testing is a legal and operational expectation for most recreational water systems. It is typically required:

As part of ongoing monitoring under HSG282, HSG179 and PWTAG.
Following system maintenance, refurbishment, or chemical dosing changes
After contamination incidents or user health complaints
When opening new facilities or re-commissioning pools and spas after closure
To verify the effectiveness of disinfection systems and automatic dosing equipment

Testing frequency varies depending on the system and its usage, but most commercial and public-use facilities require monthly microbiological sampling, with quarterly Legionella testing for higher-risk systems such as hot tubs and spa pools.

Compliance and Risk Considerations

Failing to maintain microbiological control in recreational water systems can have serious health, legal, and reputational consequences. Organisms such as Pseudomonas aeruginosa and Legionella can thrive in poorly managed water, leading to rashes, infections, or more severe illness if aerosolised and inhaled as water droplets. For commercial operators, even minor lapses can result in enforcement action, temporary closure, or loss of consumer trust.

Under the Health and Safety at Work etc. Act 1974, COSHH Regulations, and guidance contained in HSG282 and HSG179, operators are required to ensure that pool and spa water remains clean and safe for users. Routine microbiological testing provides the documented evidence needed to demonstrate compliance, validate maintenance regimes, and protect both public health and brand reputation.

At Envirochem, we help clients maintain this assurance with clarity and consistency. Our experts interpret results within the context of your operational systems and provide practical, proportionate recommendations where corrective measures are needed. The result is a safer, more resilient water management programme that stands up to both regulatory and customer scrutiny.

Why Choose Envirochem?

Envirochem has over 30 years of experience supporting leisure, hospitality, and marine operators with accurate, practical microbiological analysis. All testing is carried out by our in-house UKAS-accredited laboratory (No. 1227), ensuring complete traceability and fast turnaround times.

Our team combines technical expertise with real-world understanding of pool and spa operations. We help you interpret results, identify trends, and maintain confidence in your disinfection and maintenance regimes.

Because Envirochem works across chemical, microbiological and occupational hygiene disciplines, we can offer a joined-up approach that streamlines compliance across your sites. Whether you manage a single spa or a national leisure portfolio, our team delivers the reliability and reassurance you need to keep your water safe, compliant, and ready for use.

Speak to Our Team

If you require microbiological testing to support safe operation of your pool, spa, or leisure facility, get in touch with our team today. We’ll ensure you receive the appropriate analyses and clear, reliable results to meet your compliance duties with confidence.