© www.mitar.co.uk 2011 Rat, Mouse & Crawling Insect Risk Calculator Risk Level Probability Severity Unlikely to ever experience rat, mouse or crawling insect activity Some rat, mouse or crawling insect activity may be experienced Regular rat, mouse or crawling insect activity may be expected Extremely likely to experience considerable numbers of rat, mouse or crawling insect activity Regular rat, mouse or crawling insect activity highly likely 1. 5. 4. 3. 2. Virtually no impact on business, stock, building or staff May cause minor damage / contamination / distress / financial loss Likely to cause minor damage / contamination / distress / financial loss Likely to cause substantial damage / contamination / distress / financial loss Likely to cause great damage / contamination / distress / financial loss 5. 3. 4. 2. 1. To establish risk of rat, mouse and crawling insect activity on site, a rating between 1 - 5 should be decided for both the’probability’ and ‘severity’ as shown below Probability Severity 1. 2. 3. 4. 5. 2. 3. 4. 5. 8 15 12 9 6 10 8 6 4 25 20 15 10 20 16 12 The ‘Probability’ (1-5) should be multiplied by the ‘Severity’ (1-5) to give a score between 1 and 25. Risk Assessment Score Routine Visits per Annum QA Visits per Annum 1 - 5 0 12 - 24 16 - 25 11 - 15 8 6 4 6 - 10 0 - 4 0 - 4 0 - 1 The Risk Assessment score is a good indicator as to the ideal service frequency on site, although this can change quickly and so should be considered on an on-going basis.
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