Part E — Welfare & Health

Legionella and water hygiene

Workbook section 43

Owner

HSE Manager / Document Controller

Review / trigger

Annual review; update immediately if legal, authority, project, client, or scope requirements change.

Primary references

Plans TOC - Part E; Plan L143 Scaffold Inspection C; Plan E43 Emergency Drills Exerc

Checkpoints

Open live checklist

#	Area	Checkpoint / Requirement	Evidence / Acceptance Criteria	Responsible	Frequency
1	1. Legionella Risk Assessment & Governance	Water hygiene policy statement issued and endorsed by top management	Signed policy statement displayed and communicated	Facilities Manager	Annually
2	1. Legionella Risk Assessment & Governance	Risk assessment covers all buildings/blocks within project scope, not sampled subset only	Building-by-building coverage list cross-checked against asset register	Water Hygiene Manager	Annually
3	2. Cold Water Storage Tanks	Tank material and lining verified compatible with potable water use (no lead/unsuitable coatings)	Material compliance certificate on file	Facilities Engineer	On installation/annually
4	2. Cold Water Storage Tanks	Tank capacity assessed against demand to avoid oversizing causing stagnation	Demand calculation compared to installed tank volume	Facilities Engineer	Annually
5	3. Temperature Monitoring Regime	Thermostatic mixing valve outlet temperature checked to prevent scald risk while maintaining control	Outlet temperature reading recorded within safe scald-prevention range	Plumbing Engineer	Annually
6	3. Temperature Monitoring Regime	Data-logging temperature sensors (where installed) calibrated and data downloaded for review	Data logger download report reviewed against manual spot checks	Water Hygiene Technician	Quarterly
7	4. Little-Used Outlets & Dead Legs	Isolation valves for decommissioned sections confirmed fully closed with no leak-through	Valve isolation verification test recorded	Facilities Technician	On decommissioning
8	4. Little-Used Outlets & Dead Legs	Outlets in vacant tenancies included in flushing schedule with landlord/tenant coordination	Coordination record and flushing log for vacant units	Facilities Manager	Weekly during vacancy
9	5. Cooling Towers & Evaporative Systems	Cooling tower pack/fill media condition assessed and replaced when degraded	Fill media inspection report with replacement date if applicable	Facilities Engineer	Annually
10	5. Cooling Towers & Evaporative Systems	Cooling tower located to minimise aerosol drift towards air intakes and public areas	Siting assessment or drift study on file	Water Hygiene Manager	On installation
11	6. Sampling, Analysis & Laboratory Compliance	Sample points selected represent worst-case and representative locations per risk assessment	Sampling point rationale documented and matches schematic	Water Hygiene Manager	Annually
12	6. Sampling, Analysis & Laboratory Compliance	Duplicate/split samples periodically sent to a second laboratory for quality assurance	Cross-lab comparison report retained	Water Hygiene Manager	Annually
13	7. Building Services Water Systems (Domestic Hot/Cold)	Calorifier/water heater sludge and scale removed during service to prevent nutrient buildup	Descaling/desludging service record on file	Water Treatment Contractor	Annually
14	8. Spa Pools, Decorative Fountains & Special Risk Systems	Humidifiers and air washers included in water hygiene monitoring scope where installed	Humidifier inspection and disinfection record on file	Facilities Engineer	Quarterly
15	9. Documentation, Records & Regulatory Compliance	Water hygiene programme scope reviewed for alignment with facility management contract deliverables	FM contract SOW cross-checked against programme scope	Facilities Manager	Annually
16	10. Training, Competency & Contractor Management	Subcontracted water hygiene laboratory/contractor change of personnel notified and competency re-verified	Notification record and updated competency file	Procurement/Facilities Manager	On personnel change
17	1. Legionella Risk Assessment & Governance	Legionella risk assessment conducted for all water systems on site/facility	Written risk assessment report available, dated and referenced	Competent Person (Water Hygiene)	Annually or on system change
18	1. Legionella Risk Assessment & Governance	Responsible person/duty holder for water hygiene formally appointed	Appointment letter signed by senior management on file	Facilities Manager	On appointment
19	1. Legionella Risk Assessment & Governance	Water safety plan/scheme of control documented per recognised ACOP L8/HSG274 principles	Water safety plan document available and current	Water Hygiene Manager	Annually
20	1. Legionella Risk Assessment & Governance	Risk assessment reviewed after any significant system modification, shutdown or incident	Review record with date and trigger reason logged	Water Hygiene Manager	On change/incident
21	1. Legionella Risk Assessment & Governance	Schematic diagrams of hot and cold water systems maintained and accurate	As-built schematics available matching current system configuration	Facilities Engineer	Annually
22	1. Legionella Risk Assessment & Governance	Roles and responsibilities for sampling, monitoring and remedial action clearly assigned	RACI matrix or org chart for water hygiene program on file	Facilities Manager	Annually
23	1. Legionella Risk Assessment & Governance	Competency of assessor verified (qualified water hygiene consultant/City & Guilds or equivalent)	Assessor certificate and CV verified against scope	Facilities Manager	Per contract
24	2. Cold Water Storage Tanks	Cold water storage tanks inspected for cleanliness, integrity and covers/lids secure	Tank inspection report with photos attached	Water Hygiene Technician	Every 6 months
25	2. Cold Water Storage Tanks	Tanks cleaned and disinfected per approved procedure	Disinfection certificate with chlorine dose/contact time recorded	Water Hygiene Contractor	Annually
26	2. Cold Water Storage Tanks	Tank insulation verified to maintain cold water below 20°C	Temperature log confirms compliance at tank outlet	Water Hygiene Technician	Quarterly
27	2. Cold Water Storage Tanks	Tank overflow, vents and screens checked for insect/vermin ingress protection	Screen integrity checklist completed	Facilities Technician	Every 6 months
28	2. Cold Water Storage Tanks	Water turnover in tanks verified to prevent stagnation (no dead legs)	Flow/turnover assessment record on file	Water Hygiene Technician	Quarterly
29	2. Cold Water Storage Tanks	Tank water sampled for microbiological analysis (TVC, Legionella)	Lab certificate of analysis shows results within acceptable limits	Accredited Laboratory	Quarterly/Annually per risk
30	2. Cold Water Storage Tanks	Tank access hatches sealed and locked to prevent unauthorised access	Lock/seal integrity checked during inspection	Facilities Technician	Every 6 months
31	2. Cold Water Storage Tanks	Multiple tank installations checked for balanced flow to avoid stagnant tank	Flow balance verification recorded	Water Hygiene Technician	Every 6 months
32	3. Temperature Monitoring Regime	Hot water calorifier/generator flow temperature maintained at or above 60°C	Temperature log shows readings ≥60°C at source	Water Hygiene Technician	Monthly
33	3. Temperature Monitoring Regime	Hot water return temperature maintained at or above 50°C	Temperature log shows return readings ≥50°C	Water Hygiene Technician	Monthly
34	3. Temperature Monitoring Regime	Cold water temperature at outlets confirmed below 20°C after 2-minute run	Temperature log with timestamp and reading recorded	Water Hygiene Technician	Monthly
35	3. Temperature Monitoring Regime	Sentinel taps (nearest and furthest from source) identified and monitored monthly	Sentinel point list matches schematic and log entries	Water Hygiene Technician	Monthly
36	3. Temperature Monitoring Regime	Temperature monitoring records reviewed for anomalies and trends	Trend report generated and reviewed by responsible person	Water Hygiene Manager	Quarterly
37	3. Temperature Monitoring Regime	Non-compliant temperature readings trigger documented corrective action	Corrective action log with close-out date and method	Facilities Manager	As needed
38	3. Temperature Monitoring Regime	Calibration of temperature probes/thermometers verified against reference standard	Calibration certificate current and traceable	Water Hygiene Technician	Annually
39	3. Temperature Monitoring Regime	Mixing valves (TMVs) serviced and checked for correct blended temperature	TMV service record with outlet temperature confirmed safe	Plumbing Engineer	Annually
40	4. Little-Used Outlets & Dead Legs	Little-used outlets identified and flushed per schedule	Flushing log with outlet ID, date and duration recorded	Facilities Technician	Weekly
41	4. Little-Used Outlets & Dead Legs	Dead legs and redundant pipework identified and removed or capped	Pipework survey with removal/capping evidence	Facilities Engineer	On identification
42	4. Little-Used Outlets & Dead Legs	Flushing procedure includes precautions against aerosol inhalation (PPE, low flow)	PPE and method statement for flushing available	HSE Officer	Per flushing event
43	4. Little-Used Outlets & Dead Legs	Showerheads and hoses descaled/disinfected and inspected for biofilm	Descaling/cleaning record with date and outlet reference	Facilities Technician	Quarterly
44	4. Little-Used Outlets & Dead Legs	Vacant/unoccupied areas water systems flushed before reoccupation	Pre-occupation flushing certificate on file	Facilities Manager	Before reoccupation
45	4. Little-Used Outlets & Dead Legs	Seasonal/unoccupied buildings flushing programme documented and executed	Seasonal flushing schedule and completion log on file	Facilities Manager	Monthly during vacancy
46	5. Cooling Towers & Evaporative Systems	Cooling towers registered with relevant municipal/health authority where required	Registration certificate/reference number on file	Facilities Manager	Annually
47	5. Cooling Towers & Evaporative Systems	Cooling tower water treatment program operating with biocide dosing control	Dosing log and biocide residual results recorded	Water Treatment Contractor	Weekly
48	5. Cooling Towers & Evaporative Systems	Cooling tower basin, fill and drift eliminators inspected for cleanliness and fouling	Inspection checklist with photographic evidence	Water Hygiene Technician	Monthly
49	5. Cooling Towers & Evaporative Systems	Cooling water sampled for Legionella and TVC per schedule	Certificate of analysis retained, action level thresholds checked	Accredited Laboratory	Monthly
50	5. Cooling Towers & Evaporative Systems	Emergency shutdown/shock dosing procedure in place for high Legionella counts	Documented escalation procedure with authority notification steps	Water Hygiene Manager	Per event
51	5. Cooling Towers & Evaporative Systems	Cooling tower shutdown/mothballing procedure includes safe drain-down and disinfection	Mothballing record with disinfection certificate	Facilities Engineer	On shutdown
52	5. Cooling Towers & Evaporative Systems	Cooling tower system log book maintained with dosing, cleaning and inspection entries	Log book reviewed complete and up to date	Water Treatment Contractor	Weekly
53	6. Sampling, Analysis & Laboratory Compliance	Water samples collected using aseptic technique by trained personnel	Sampling method statement and technician training record	Water Hygiene Technician	Per schedule
54	6. Sampling, Analysis & Laboratory Compliance	Samples analysed by UKAS/ISO 17025 accredited (or locally recognized) laboratory	Lab accreditation certificate verified and current	Water Hygiene Manager	Annually
55	6. Sampling, Analysis & Laboratory Compliance	Sample chain-of-custody documented from collection to lab receipt	Chain-of-custody form completed and retained	Water Hygiene Technician	Per sample
56	6. Sampling, Analysis & Laboratory Compliance	Action levels defined for Legionella count (e.g., >1000 cfu/L requires resample/remedial action)	Escalation matrix documented and results compared	Water Hygiene Manager	Per result
57	6. Sampling, Analysis & Laboratory Compliance	Positive Legionella results trigger immediate risk review and remedial action plan	Incident report with remedial action and re-sampling schedule	Water Hygiene Manager	On positive result
58	6. Sampling, Analysis & Laboratory Compliance	Sample results trended over time to identify recurring problem outlets	Trend analysis report reviewed at management meeting	Water Hygiene Manager	Quarterly
59	7. Building Services Water Systems (Domestic Hot/Cold)	Water meters and pressure checked to identify leaks affecting stagnation risk	Pressure/flow test record on file	Facilities Engineer	Quarterly
60	7. Building Services Water Systems (Domestic Hot/Cold)	Booster pump sets and pressure vessels inspected for hygiene and corrosion	Inspection report with corrosion/hygiene status	Facilities Engineer	Every 6 months
61	7. Building Services Water Systems (Domestic Hot/Cold)	Water softeners and filters serviced and backwashed as per manufacturer guidance	Service record with backwash date and filter change	Water Treatment Contractor	As per manufacturer schedule
62	7. Building Services Water Systems (Domestic Hot/Cold)	Point-of-use filters (where installed) changed per manufacturer schedule	Filter change log with date and batch reference	Facilities Technician	As per manufacturer schedule
63	7. Building Services Water Systems (Domestic Hot/Cold)	Cross-connection and backflow prevention devices tested	Backflow preventer test certificate current	Plumbing Engineer	Annually
64	7. Building Services Water Systems (Domestic Hot/Cold)	Insulation of hot and cold pipework verified intact to maintain temperature differential	Insulation condition survey completed	Facilities Engineer	Annually
65	8. Spa Pools, Decorative Fountains & Special Risk Systems	Spa pools/whirlpools tested for free chlorine/bromine and pH per schedule	Pool water test log within recommended chemical ranges	Pool Operator	Daily
66	8. Spa Pools, Decorative Fountains & Special Risk Systems	Spa pool filters backwashed and balance tanks drained/cleaned per schedule	Backwash and cleaning record maintained	Pool Maintenance Contractor	Weekly
67	8. Spa Pools, Decorative Fountains & Special Risk Systems	Decorative fountains/water features risk assessed for aerosol generation	Fountain-specific risk assessment on file	Water Hygiene Manager	Annually
68	8. Spa Pools, Decorative Fountains & Special Risk Systems	Emergency eyewash/safety showers included in water hygiene monitoring scope	Flushing and temperature log for eyewash/shower stations	Facilities Technician	Weekly
69	8. Spa Pools, Decorative Fountains & Special Risk Systems	Spa pool water fully drained, cleaned and disinfected per manufacturer/health authority schedule	Drain-clean-disinfect certificate on file	Pool Maintenance Contractor	Weekly
70	9. Documentation, Records & Regulatory Compliance	Written scheme of control retained on-site and available for inspection	Document available in facility management office/EAMS	Facilities Manager	Ongoing
71	9. Documentation, Records & Regulatory Compliance	Water hygiene records retained for minimum period per authority/insurer requirement	Record retention log confirms minimum 5-year archive	Document Controller	Ongoing
72	9. Documentation, Records & Regulatory Compliance	Compliance verified against Dubai Municipality / Abu Dhabi Department of Health water quality and Legionella control guidelines as applicable	Local authority circular reference cited in water safety plan	HSE Manager	Annually
73	9. Documentation, Records & Regulatory Compliance	Compliance verified against ESMA/UAE drinking water standards for potable water quality	ESMA standard reference number cited in test scope	Water Hygiene Manager	Annually
74	9. Documentation, Records & Regulatory Compliance	Third-party water hygiene audit conducted independent of routine contractor	Independent audit report with findings and closeout tracker	HSE Manager	Annually
75	9. Documentation, Records & Regulatory Compliance	Legionella outbreak/incident notification procedure aligned with public health authority reporting requirements	Notification procedure document references correct authority contact	HSE Manager	Per incident
76	9. Documentation, Records & Regulatory Compliance	Insurance/liability cover for water hygiene contractor confirmed adequate for scope	Insurance certificate reviewed and filed	Procurement/Facilities Manager	Annually
77	10. Training, Competency & Contractor Management	Water hygiene contractor holds valid trade license and relevant competency certification	License and certification verified before contract award	Procurement/Facilities Manager	Per contract
78	10. Training, Competency & Contractor Management	Facilities personnel trained in legionella awareness and safe flushing procedures	Training attendance record and certificates on file	HSE Officer	Annually
79	10. Training, Competency & Contractor Management	Method statement and risk assessment submitted by water hygiene contractor prior to works	MS/RA reviewed and approved before mobilisation	HSE Manager	Per task
80	10. Training, Competency & Contractor Management	Emergency contact list for water hygiene issues displayed and current	Contact list posted in plant room and control office	Facilities Manager	Annually
81	10. Training, Competency & Contractor Management	Contractor performance reviewed against KPIs for water hygiene programme	KPI scorecard completed and reviewed with contractor	Facilities Manager	Quarterly
82	11. New/Modified Systems & Commissioning	New water systems commissioned with disinfection prior to first use	Commissioning disinfection certificate on file	Commissioning Engineer	Pre-handover
83	11. New/Modified Systems & Commissioning	Pre-handover water sampling conducted and clear results obtained before occupation	Certificate of analysis clear of Legionella before handover	Water Hygiene Manager	Pre-handover
84	11. New/Modified Systems & Commissioning	Temporary water supplies during construction assessed for stagnation risk	Temporary supply risk assessment and flushing plan available	Site Engineer	Per project phase
85	11. New/Modified Systems & Commissioning	System modifications (pipework changes, new outlets) risk-assessed before commissioning	Modification risk assessment signed off prior to use	Water Hygiene Manager	Per modification
86	11. New/Modified Systems & Commissioning	As-built drawings updated and issued to facilities team post-commissioning	Updated drawings received and filed in O&M manual	Commissioning Engineer	Post-handover
87	12. Emergency Response & Outbreak Management	Legionella outbreak response plan documented with roles and escalation steps	Outbreak response plan available and communicated to key staff	Water Hygiene Manager	Annually
88	12. Emergency Response & Outbreak Management	Emergency shock chlorination/disinfection procedure available for rapid deployment	Procedure document with required materials and PPE listed	Water Hygiene Contractor	Annually
89	12. Emergency Response & Outbreak Management	Public health authority and occupier notification protocol established for suspected cases	Notification protocol with correct authority contact details	HSE Manager	Annually
90	12. Emergency Response & Outbreak Management	Post-incident review conducted with corrective/preventive actions tracked to closure	Post-incident report with CAPA closeout evidence	HSE Manager	Post-incident
91	12. Emergency Response & Outbreak Management	Communication plan for building occupants during remedial works established	Occupant notice/communication record on file	Facilities Manager	Per incident
92	12. Emergency Response & Outbreak Management	Standby/backup water hygiene contractor arrangement in place for emergency response	Standby contractor agreement or call-off contract available	Facilities Manager	Annually

Each checkpoint records Status (Yes / No / N/A), Comments, Corrective Action and Sign-off. Switch to Complete in-app to fill it here, or download the blank version to complete on site.

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