Commercial Water Hygiene & Legionella Control
Complete HSE ACoP L8 and HSG274 water safety compliance for facilities managers, commercial estates, and duty holders
across the Thames Valley
Statutory Water Safety & Legionella Compliance Management
At Thames Air & Water Tech, we provide complete water hygiene and Legionella compliance services engineered to safeguard public health, maintain system integrity, and ensure strict adherence to HSE ACoP L8 and HSG274 regulations.
From routine temperature monitoring and tank chlorination to full risk assessments and remedial pipework, our clients manage every asset effortlessly through our digital compliance portal, providing live auditable records, automated alerts, and complete audit readiness.
We're here to help.
Our Water Hygiene Services
Legionella Risk Assessment (LRA)
Under the Health and Safety at Work etc. Act 1974, duty holders and commercial property managers must carry out a statutory Legionella risk assessment.
Our certified water hygiene assessors conduct comprehensive, site-specific site surveys in accordance with HSE ACoP L8 (4th Edition) and BS 8580-1:2019 to evaluate hot and cold water systems, identifying microbiological risks and stagnation before issues arise.
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Complete asset registers, system schematics, and photographic condition surveys
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Prioritised remedial action plans addressing immediate regulatory non compliance
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Secure digital logbook integration with cloud-based audit trails for statutory inspection
Legionella Control & Monitoring Regimes
A robust planned preventative maintenance (PPM) programme is essential to maintain HSG274 water safety compliance. We establish and execute bespoke water hygiene monitoring schemes across commercial premises, facilities estates, and multi tenanted buildings throughout the Thames Valley.
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Routine water temperature monitoring across sentinel taps, calorifiers, and storage tanks
- Historical logbook gap analysis to ensure full audit readiness for environmental health inspections
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Immediate non-conformance alerting with engineering remediation and root-cause analysis
Cold Water Storage Tank Cleaning & Chlorination
Commercial cold water storage tanks are primary areas for sediment build-up, bio-film formation, and thermal gain. Our qualified technicians perform complete water tank cleaning, chemical disinfection, and mechanical refurbishment compliant with BS 8558:2015, the Water Supply (Water Fittings) Regulations 1999, and HSE ACoP L8.
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Physical desilting, chemical disinfection, and chlorination with verified chemical neutralisation
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Remedial tank upgrades: screened air vents, overflow screens, and close-fitting bye-law lids
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Full digital chlorination certificates with pre- and post-cleaning photographic evidence
TMV Servicing, Testing & Maintenance
Thermostatic Mixing Valves (TMVs) provide vital anti-scald protection while permitting commercial hot water distribution networks to circulate at temperatures that suppress Legionella pneumophila. We deliver scheduled TMV servicing, failsafe shut-off testing, and thermal calibration across healthcare, educational campuses, and commercial offices.
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Annual service failsafe shut-off checks and precision mixed-water temperature calibration
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Complete valve isolation, mechanical teardown, chemical strainer descaling, and check valve testing
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Individual TMV asset tagging and digital compliance logging across all commercial washroom facilities
Water Temperature Monitoring & Sentinel Outlet Checks
Temperature control is the primary line of defence in preventing waterborne bacteria from multiplying within commercial plumbing systems. In line with HSE ACoP L8 and HSG274 Part 2, we provide scheduled monthly temperature testing to verify that cold water remains below 20°C and hot water achieves at least 50°C (55°C in healthcare facilities) at sentinel outlets.
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Routine inspection of calorifier flow and return temperatures, storage tanks, and distal taps
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Calibrated digital thermometers to ensure exact data accuracy and audit compliance
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Real time temperature exception reporting uploaded immediately to our digital compliance logbook
Infrequently Used Outlet
Flushing Regimes
Water stagnation in dead legs or under-utilised pipework creates ideal conditions for biofilm accumulation and Legionella growth. We design and execute planned weekly outlet flushing schedules for commercial offices, vacant units, schools, and seasonal premises to maintain system turnover and water quality.
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Tailored weekly flushing protocols targeting low-use sinks, showers, toilets, and hose outlets
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Stagnation risk reduction adhering strictly to HSG274 Part 2 water safety guidance
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Fully auditable digital records detailing flush duration, location, water clarity, and temperature
Showerhead Cleaning, Descaling & Disinfection
Showers and spray outlets create respirable aerosols, making them significant risk vectors for Legionnaires' disease. As mandated by HSE ACoP L8, commercial showers require regular dismantling, descaling, and chemical disinfection to eradicate limescale deposits that harbour dangerous microbiological pathogens.
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Quarterly dismantling, chemical descaling, and disinfection of showerheads, hoses, and spray taps
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Removal of mineral scaling, biofilm, and particulate matter to restore full flow and water hygiene
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Comprehensive documentation and photographic records uploaded for commercial facilities compliance
Water Softener Servicing &
Salt Supply
Hard water areas accelerate limescale formation within calorifiers, pipework, and plant equipment, creating rough surfaces where bacteria colonise. We provide end-to-end commercial water softener maintenance, resin regeneration testing, and routine salt replenishment to protect equipment and optimize energy efficiency.
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Preventative maintenance, valve servicing, and meter calibration for single and duplex systems
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Total hardness testing to ensure output water adheres to regulatory thresholds
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Reliable scheduled tablet and block salt deliveries across the Thames Valley
UKAS Accredited Water Sampling & Microbiological Testing
Verifying water safety often requires independent laboratory verification. We collect water samples strictly under chain of custody for testing at UKAS-accredited laboratories, delivering rapid, defensible analysis for commercial facilities, cooling towers, and commercial closed water systems across the Thames Valley.
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Analysis for Legionella species, Pseudomonas aeruginosa, Total Viable Counts (TVC), and E. coli
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Potability testing for mains drinking water supplies and commercial catering environments
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Fast certificate turnarounds with immediate engineering advice and remedial action if thresholds are breached
Full List Of Services
Legionella Risk Assessments.
Legionella Control Regime.
UKAS Accredited Sampling.
Cold Water Storage Tank Disinfect.
TMV Servicing.
Shower / Spray De-Scale.
Calorifier Inspections.
Point Of Use Heater Servicing.
Temperature Monitoring.
Water Softener Servicing.
Infrequently Used Outlet Flushing.
RPZ Valve Servicing.
Expansion Vessel Flushing.
Dead Leg Removal.
Plate Heat Exchanger.
Our Accreditations
Our dedication to maintaining excellence and adhering to industry best practices.
