Environmental Surveillance, Sampling, Monitoring and Auditing for Infection Prevention and Control

Dr Chantel Swart (PhD)

Quality Manager – Test It LAB

Test It LAB

We are a water testing laboratory offering water analysis according to SANS241:2015 requirements. We pride ourselves in not only providing an analytical service but also engaging with our clients to advise them of possible risks and helping them find the best way to treat and use their water

Question

How can Environmental Health Practitioners use environmental surveillance, sampling and auditing to verify that IPC measures are effective and protect patients from environmental sources of infection?

Think beyond compliance: how do we know the control measure is actually working?

Monitoring, surveillance, inspection and audit

MONITORING

Routine observation or measurement of a specific parameter

SURVEILLANCE

Information collected over time, analysed, interpreted, reported and acted upon

INSPECTION

Identifies current conditions and deficiencies

AUDIT

Evaluates compliance with standards and whether systems are effective

Monitoring, surveillance, inspection and audit

• Four tools answer different questions

• Use each tool for the decision it can actually support

MONITOR

What is happening now?

Chlorine, temperature, turbidity or pressure

SURVEIL

What is changing over time?

Water-quality trends, interruptions and response

INSPECT

What condition exists?

Storage tanks, showers, taps or treatment areas

AUDIT

Does the system comply — and work?

Evaluate the Water Safety Programme and records

Monitoring

MONITORING

Routine observation or measurement of a specific parameter

• Monitoring starts with having a plan

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• What should be monitored – based on risk and compliance standards
• What should be tested – which tests should be conducted on samples
• When should it be monitored – determine a schedule for sampling
• How should it be monitored – which sampling methods should be used

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Sampling

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Sampling

• Environmental sampling is a monitoring and surveillance tool
• It should answer a specific question
• Before sampling, ask: what questions are we trying to answer?

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What environmental sampling is – and what it is not

• Planned collection of environmental specimens to assess IPC controls or investigate a potential environmental source of infection
• Should be used as part of a risk assessment, outbreak investigation, verification activity, corrective-action evaluation, investigation of unusual findings or as part of a routine monitoring plan (should have an objective)
• Should never replace routine cleaning, maintenance or good IPC practices
• Routine sampling without a clear objective is generally discouraged

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When may environmental sampling be appropriate?

• As part of routine monitoring (should have an objective)
• When a healthcare-associated outbreak is suspected
• When water contamination is suspected
• When repeated environmental failures occur
• When a new healthcare facility is commissioned
• When major renovations have been completed
• If engineering systems have failed
• When water interruptions have occurred
• When a monitoring programme requires verification

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Sampling principles

• Clearly defined objectives
• Appropriate sampling methods
• Correct sampling equipment
• Proper specimen handling
• Chain of custody where applicable
• Laboratory support
• Interpretation within the context of the risk assessment

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Sampling results should never be interpreted in isolation

The method must fit the question, the environment and the decision that will follow

Surface sampling

• May be used to assess high-touch surfaces, cleaning effectiveness, environmental contamination and outbreaks
• High-touch examples include bed rails, door handles, light switches, nurse call buttons, workstations, treatment trolleys, infusion pump controls and touch screens
• Sampling should focus on areas presenting the greatest risk to patients

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ATP monitoring: useful, but know its limitations

• Advantages: immediate results, rapid feedback, objective measurement, useful for staff education
• Limitations: does not identify microorganisms; low ATP does not guarantee sterility
• Best used as a quality-improvement tool alongside cleaning audits and visual inspection

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ATP measures organic material remaining on a surface after cleaning

Microbiological surface sampling

• May be appropriate during outbreak investigations
• May support validation of cleaning procedures
• May investigate persistent contamination
• May verify specialised decontamination processes
• Environmental Health Practitioners should work closely with microbiology laboratories when microbiological sampling is required

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Water sampling

• Supports Water Safety Management Programmes
• May include drinking water, storage tanks and high-risk clinical areas
• Other examples include dialysis systems, showers, ice machines, cooling systems and decorative water features
• Collection should follow documented procedures to minimise contamination

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Water sampling

• Water is one part of a wider environment

• Water safety connects to the rest of the facility’s IPC system

WATER

quality • storage • interruptions

FOOD

kitchen hygiene • temperatures

CLEANING

high-touch surfaces • schedules

RISK WASTE

segregation • storage • contractors

LAUNDRY

dirty/clean separation • PPE

INDOOR AIR

ventilation • pressure • filters

PESTS

sightings • devices • conditions

Air sampling

• Not routinely required in every healthcare facility
• May be indicated during commissioning of specialised units
• May be appropriate after engineering failures, construction or renovation
• May support outbreak investigations or specialised high-risk clinical environments
• Environmental Health Practitioners should understand both indications and limitations

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Every method has a job — and a limit

WATER

Drinking water, tanks, showers, dialysis and ice

Collection must minimise contamination

SURFACE

High-touch surfaces and cleaning effectiveness

Selection and timing matter

ATP

Rapid feedback after cleaning

Measures organic material — not microorganisms

MICROBIOLOGY

Outbreaks, persistent contamination and validation

Needs laboratory support and interpretation

AIR

Specialised units, engineering failures and renovations

Not routinely required in every facility

Interpreting environmental results

• Interpret alongside patient surveillance data and clinical context
• Consider IPC findings, environmental inspections and maintenance records
• Review cleaning audits and water safety records where relevant
• A single abnormal result does not necessarily indicate a widespread environmental problem
• Trend analysis is often more valuable than isolated findings

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Context turns a result into evidence

Designing an environmental monitoring programme

WHAT

WHY

FREQUENCY

WHO

LIMIT

ACTION

RECORD

A well-designed programme defines what is monitored, why, frequency, responsible persons, acceptable limits, corrective actions and documentation requirements

Surveillance

SURVEILLANCE

Information collected over time, analysed, interpreted, reported and acted upon

What is environmental surveillance?

Continuous collection and interpretation of environmental information to identify hazards and support Infection Prevention and Control

Preventive

Evidence-based

Systematic

Risk-based

Continuous

Purpose: informed decision-making and continuous improvement

Why environmental surveillance matters

• Healthcare facilities implement many IPC control programmes
• Implementation alone does not guarantee effectiveness
• Environmental surveillance provides objective evidence that controls continue to function as intended
• It enables early hazard detection, trend analysis, evaluation of corrective actions and continuous quality improvement

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Decisions should be based on objective findings rather than assumptions

Environmental health surveillance areas

Water�quality • temperature • Legionella • tanks • interruptions

Food safety�kitchen hygiene • temperatures • HACCP • staff hygiene

Environmental cleaning�high-touch surfaces • cleaning compliance • documentation

Healthcare risk waste�segregation • storage • documentation • contractors

Laundry�dirty–clean separation • storage • workflow • PPE

Indoor air quality�ventilation • air exchanges • pressure • filter maintenance

Pest management�sightings • monitoring devices • contractor reports • conditions

Risk-based surveillance

• Not every area requires the same level of surveillance
• Higher-risk departments require more frequent or intensive monitoring
• The guideline identifies ICU, neonatal, burns, operating theatres, dialysis, isolation and oncology as examples of higher-risk areas
• Prioritisation should reflect patient vulnerability and environmental risk

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Discussion: Which environmental hazards would you prioritise in a neonatal unit? An operating theatre? A kitchen?

The surveillance cycle

Identify�Risks

Plan�Monitoring

Collect�Information

Analyse�Results

Implement�Actions

Evaluate�Improvement

Continue�Monitoring

Surveillance is a continuous improvement cycle — not a once-off inspection or test

Designing a surveillance programme

1

Identify key environmental risks

2

Select monitoring indicators

3

Determine sampling requirements

4

Set audit frequencies

5

Assign responsibilities

6

Define reporting pathways

7

Develop corrective actions

8

Set review dates

Inspection

INSPECTION

Identifies current conditions and deficiencies

What an inspection does

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• Examines the physical environment and current practices at a specific point in time
• Identifies visible hazards, deficiencies, damage, poor maintenance or unsafe conditions
• Uses direct observation and may include discussion with staff and review of relevant records
• Provides evidence for immediate correction and may identify issues requiring further monitoring, sampling or audit

Inspection asks: “What condition exists now?”�Audit asks: “Does the system comply and work effectively?”

Audit

AUDIT

Evaluates compliance with standards and whether systems are effective

• Audits assess whether environmental health systems comply and function effectively

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What should an environmental audit evaluate?

• Policies and procedures
• Staff competency
• Infrastructure
• Documentation
• Monitoring records
• Corrective actions
• Compliance with legislation
• Quality improvement activities

Audits evaluate systems, not individuals

Audit planning and conduct

PLAN

Objectives

Scope

Applicable standards

Audit criteria

Audit team

Required documents

CONDUCT

Opening meeting

Document review

Facility inspection

Staff interviews

Observation of practices

Record review

Closing meeting

Audit procedure

1

Opening

meeting

2

Document

review

3

Facility

inspection

4

Staff

interviews

5

Observe

work

6

Review

records

7

Closing

meeting

Performance indicators and trend analysis

Water Safety: % compliant water quality samples

Food Safety: Kitchen inspection compliance score

Environmental Cleaning: High-touch surface audit compliance

Healthcare Risk Waste: Segregation compliance

Laundry: Clean linen quality score

Pest Management: Number of pest sightings

Indoor Air Quality: Ventilation maintenance compliance

Trend analysis identifies repeated deficiencies, seasonal patterns, emerging risks and improvement after interventions

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Reporting audit findings

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• Scope
• Findings and supporting evidence
• Risk rating
• Recommendations
• Responsible persons
• Timeframes
• Follow-up requirements

Recommendations should be practical and prioritised

Good reporting makes accountability and follow-up visible

Root cause analysis and corrective action

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Why did the problem occur?

What system failed?

Could the problem recur?

What preventive measures are needed?

Correct the system — not only the symptom

Then verify effectiveness through continued surveillance

Root cause analysis and corrective action

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• Example: repeated poor hand-hygiene facilities in outpatient clinics

SYMPTOM

Soap dispensers

keep failing

ROOT CAUSES

Procurement delays

No routine inspections

Poor interdepartmental communication

Root cause analysis and corrective action

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• The response is multidisciplinary and measurable

FINDINGS

Inconsistent high-touch cleaning

Delayed handwashing maintenance

Incomplete cleaning records

Poor communication

IMPROVEMENT PLAN

Refresher training

Revised schedules

Routine ATP monitoring

Monthly audits

Maintenance reporting

Quarterly reviews

SIX-MONTH RESULT

Better audit compliance

Fewer environmental deficiencies

Stronger communication

Lower HAI rate

Surveillance creates the evidence for targeted improvement

Governance, programme review and staff education

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• Surveillance programmes should be reviewed regularly for effectiveness, completion of corrective actions, risk reduction and emerging risks
• Findings should be reported into organisational governance structures such as IPC, Quality Improvement, Occupational Health and Safety, Executive Management and relevant technical committees
• Staff should understand why surveillance is conducted, how to report concerns, the importance of documentation and their role in improvement
• Feedback should be shared to promote learning

The Environmental Health Practitioner’s role

• Conduct inspections and audits
• Collect environmental information
• Analyse trends and interpret findings
• Advise management
• Monitor corrective actions
• Support IPC Committees and outbreak investigations
• Coordinate environmental surveillance programmes
• Drive evidence-based continuous quality improvement

Key take-home messages

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• Environmental surveillance is proactive and evidence-based
• Monitoring, sampling, inspection and auditing have distinct but complementary roles
• Environmental sampling should always have a clearly defined purpose
• Trend analysis is more valuable than isolated measurements
• Audit findings should drive system improvement rather than assign blame
• EHPs are central to surveillance, interpretation, corrective action and continuous quality improvement
• Effective surveillance strengthens IPC and improves patient safety

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