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Pool Water Testing

Water Testing for Swimming Pools, Spas & Hot Tubs

Acorn Environment Services is a leading water and environmental engineering specialist offering a range of laboratory based microbiological analysis and swimming pool water testing solutions (including tests for spas, hot tubs and hydrotherapy pools) to businesses, local authorities, healthcare organisations, schools, universities and private individuals throughout the UK and Ireland.

Our specialist laboratory procedures include tests for a range of common pathogens found in pool waters including E. coli, Pseudomonas aeruginosa, Total coliforms, TVC/Aerobic colony counts, Legionella bacteria and other less common organisms that can contaminate pools.

If you’re one of the many UK businesses, councils, hospitals, schools, universities or private households who own or operate a pool, hot tub or spa, then you’ll already know that maintaining the quality of the water in your pool is something which can’t be ignored.

Why test swimming pool water?

Unlike other water systems found in homes and commercial premises where the water is flushed or drained away after each use, swimming pools, hot tubs and spas could be considered as a re-circulating water system where the water is retained and re-used many times over.

If you’re not testing the chemical and microbial water quality regularly, taking steps to maintain balance and keep it clean, issues such as pH and water clarity can change, and more worryingly bacteria can start to grow rapidly.

swimming pool

What bacteria can contaminate a pool, spa or hot tub?

Bacteria such as E. coli, Pseudomonas aeruginosa and Legionella thrive in warm, poorly or untreated water and have the potential to make people using the pool or spa very ill.

Don’t assume that water which appears crystal clear is clean and safe to use – the types of bacteria which can grow in water are invisible to the naked eye.

All water samples collected are processed by independent UKAS accredited laboratory facilities within 6 hours of collection.

Certificates of analysis will be sent to the client following the receipt of results from the laboratory.

Contact Acorn today to discuss a water management programme for your property. 


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jacuzzi with champagne and glass on table

UK laws dealing with water quality testing in pools, spas and hot tubs.

HSG282 gives advice on effective ways to safely manage and control spa-pool systems through:

■ design, commissioning, operation and maintenance;
■ testing and monitoring spa-pool water quality;
■ quality and frequency of inspections.

Legislation covering the control of legionella and other infectious agents in spa-pool systems can be found here.


UK health and safety laws dealing with swimming pool and spa water quality, testing and treatment really only come into play if you’re running a business such as a leisure centre, gym or hotel, or the pool is in a holiday property which is let to paying guests.

Owners and operators of pools and spas need to ensure sure that the water quality and treatment programmes are effective and meet current standards.

Although the law might not apply to domestic pools and spas, they provide excellent guidelines and standards which it makes sense to read, understand and comply with.

For more information both the Health and Safety Executive and the Pool Water Treatment Advisory Group (PWTAG) provide excellent guidance to help pool operators comply with health and safety law.

swimming pool

Call 0161 483 7112 to book an appointment. Available 24/7

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Frequently Asked Questions

Yes, by managing systems where legionella is most likely found. Secondly, contacting a professional who can complete treatment on sources where the risk of legionella is high is also advised.

Legionnaires’ disease can be contracted when water droplets containing Legionella bacteria enter a person’s lungs.

There is currently no cap on fines for Legionella. However, examples show companies being fined nearly £2 million after failing a legionella test

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