Risk rating

LIKELIHOOD

Catastrophic

Critical

Major

Minor

Negligible

Very likely

1

1

2

3

3

Likely

1

1

3

4

4

Unlikely

2

2

4

4

4

Highly unlikely

3

3

4

5

5

1

Urgent - Hazard to be controlled within 24 hours

2

High - Hazard to be controlled within 1 week

3

Medium - Hazard to be controlled within 1 month

4

Low - Hazard to be controlled within 4 months

5

None - Hazard to be re-assessed within 6 months or when work environment, work task or plant changes.