Microbial Water Testing Services
Airmid Healthgroup provides independent microbial water testing for drinking water, environmental water, and process water applications. Our experienced microbiology team tests for E. coli, total coliforms, Legionella, and other waterborne pathogens — delivering reliable results to support regulatory compliance, risk management, and operational monitoring across a range of sectors.
Accreditation note: Airmid Healthgroup’s ISO/IEC 17025 accreditation covers specific allergen testing methods. Water testing is conducted by our experienced microbiology team using validated analytical methods and GLP-trained laboratory practices. If ISO 17025-accredited water testing is a specific requirement for your application, please discuss this with our team at the enquiry stage.
Scope
Our water testing service covers microbiological analysis of water samples from drinking water systems, environmental water sources, and industrial or process water applications. Testing is focused on indicator organisms and pathogens of primary public health and regulatory significance.
Water types tested
Drinking water
- → Mains and public supply
- → Private wells and boreholes
- → Building water systems (hot and cold)
- → Bottled and dispensed water
Environmental water
- → Rivers, lakes, and streams
- → Groundwater and aquifers
- → Recreational and bathing water
- → Wastewater effluent monitoring
Process water
- → HVAC cooling towers and systems
- → Industrial manufacturing water
- → Spa, pool, and leisure water
- → Food and beverage process water
Microbial parameters tested
- → Escherichia coli (E. coli) — primary faecal contamination indicator; regulatory limit of zero in drinking water
- → Total coliforms — broad indicator of treatment efficacy and distribution integrity
- → Legionella spp. and Legionella pneumophila — critical for cooling towers, hot water systems, and any water system posing an inhalation risk
- → Enterococci — faecal indicator used in environmental and bathing water monitoring
- → Total Viable Count (TVC) — at 22°C and 37°C, indicating general microbiological load
- → Pseudomonas aeruginosa — relevant for pool water, spa water, and immunocompromised-risk environments
Additional parameters available on request. Panel selection is advised based on water type, intended use, and the applicable regulatory standard or risk assessment framework.
Regulatory context
Microbial water quality is regulated under a range of national and EU frameworks depending on water type and use. Key standards relevant to our clients include:
Drinking water
EU Drinking Water Directive (2020/2184) and SI 122 of 2014 (Ireland). Zero tolerance for E. coli and coliforms in water intended for human consumption.
Legionella risk
HSA Code of Practice (Ireland) and HSE L8 Approved Code of Practice (UK). Mandatory monitoring for cooling towers, hot water systems, and healthcare water networks.
Environmental water
EU Water Framework Directive and Bathing Water Directive (2006/7/EC). E. coli and enterococci are the primary indicators for recreational and bathing water classification.
Process water
Industry-specific standards including BS 8580 (Legionella risk assessment), PWTAG guidelines for pool and spa water, and sector-specific HACCP requirements for food and beverage process water.
Independent scientific testing
Airmid Healthgroup’s microbiology team brings deep expertise in environmental and waterborne pathogen detection — the same scientific rigour applied to our bioaerosol, antimicrobial, and allergen testing programmes. Water test results are accompanied by a detailed analytical report documenting sample receipt, methods used, results, and interpretation against applicable standards or action levels.
Standard turnaround: 5–10 working days from sample receipt, depending on parameter and incubation requirements. Legionella culture requires a minimum of 10 days incubation per standard method.
Sample collection and submission
Reliable microbiological results depend as much on correct sampling as on laboratory analysis. Contamination during collection is the most common cause of false positive results. Airmid Healthgroup provides:
- → Sterile sample containers with appropriate preservatives (sodium thiosulphate for chlorinated water; no preservative for Legionella)
- → Written sampling instructions tailored to water type and parameter
- → Guidance on flushing protocols, first-draw sampling, and representative sampling points
- → Cold-chain transport requirements: samples must be maintained at 1–8°C and received within 24 hours for microbiological parameters
- → On-site sampling support available for larger programmes or complex water systems
Testing options sized for your needs
From single compliance samples to ongoing monitoring programmes — we scope every engagement to your water system, regulatory requirement, and testing frequency.
Frequently Asked Questions
What microbial parameters does Airmid test for in water?
Our standard panel covers total coliforms, E. coli, Legionella spp. and Legionella pneumophila, enterococci, total viable count (TVC) at 22°C and 37°C, and Pseudomonas aeruginosa. Additional parameters are available on request. Panel selection is guided by water type, intended use, and applicable regulatory standard or risk assessment requirements — and we advise on appropriate parameter selection as part of every engagement.
Is Airmid Healthgroup ISO 17025 accredited for water testing?
Airmid Healthgroup’s ISO/IEC 17025 accreditation covers specific allergen testing methods. Water testing is conducted by our experienced microbiology team using validated analytical methods and GLP-trained laboratory practices, but does not fall within our current ISO 17025 accreditation scope. We are transparent about this distinction. If accredited water testing is a specific requirement for your application — for example, for statutory compliance reporting to a regulator — please discuss this with our team at the enquiry stage and we can advise accordingly.
How should water samples be collected and transported?
Sample collection must follow validated protocols to avoid contamination. Airmid Healthgroup provides sterile containers with appropriate preservatives, written sampling instructions, and guidance on flushing protocols and representative sampling points. Samples must be transported at 1–8°C and received by the laboratory within 24 hours for microbiological parameters. Legionella samples have specific volume and container requirements — we advise on these at the time of engagement.
How long does Legionella testing take?
Legionella culture by the standard method (ISO 11731) requires a minimum of 10 days incubation — this is a biological requirement of the method and cannot be shortened. Results are therefore typically available within 12–14 working days of sample receipt. Rapid PCR-based detection methods can provide indicative results more quickly, though culture remains the reference method for most regulatory and risk management purposes. We advise on method selection based on your timeline and regulatory requirements.
What happens if a result exceeds a regulatory limit or action level?
We report all results clearly against applicable regulatory limits or standard action levels, and flag any exceedances in the results report. For clients on a monitoring programme, we provide exceedance alerts and can advise on immediate response actions, repeat sampling design, and remediation options. Our Investigation & Advisory service is available for more complex situations requiring root cause analysis and documented investigation reports.
Related services
Environmental Field Studies
BS EN 1275:2005 — Fungicidal & Yeasticidal Activity
BS EN 1276:2019 — Bactericidal Activity Testing
BS EN 13697:2015 — Surface Disinfectant Testing
Customised Projects
