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To determine the passing mark for WSPs, a minimum score of 3 in all of the 28 output indicators was considered. The score of 3 means that the drinking-water service provider has completed the major requirements, but with errors in understanding minor concepts in any of the output indicators. This computation resulted in 60% as the minimum WSP Index needed for WSP acceptance. The robustness of this benchmark was tested using sensitivity analysis and it was found that a minimum benchmark of 74% for WSP acceptability is more realistic (Table 3).

Table 3

Simulating WSP Index by adjusting the scores of WSP steps

StageStepOutput indicatorMax scoreAssumption
12
1. Management support 
2. WSP team 
3. Stakeholders 
4. Users and uses 
5. Drinking water quality standards 
6. Schematic/flow diagrams 
7. System description 
8. Risk assessment methodology 
9. Hazardous events 
10. Raw risks 
11. Control measures 
12. Residual risks 
13. Significant risks 
14. Improvement plan link to risks 
15. Improvement plan details 
16. Operational monitoring plan 
17. Corrective action 
18. Compliance monitoring plan 
19. Internal auditing plan 
20. External auditing plan 
21. Consumer satisfaction monitoring plan 
22. SOPs – Normal 
23. SOPs – Incident 
24. SOPs – Emergency 
25. Supporting program description 
26. Supporting program plan 
10 27. Periodic review plan 
11 28. Revision plan 
WSP Index 60% 74% 
StageStepOutput indicatorMax scoreAssumption
12
1. Management support 
2. WSP team 
3. Stakeholders 
4. Users and uses 
5. Drinking water quality standards 
6. Schematic/flow diagrams 
7. System description 
8. Risk assessment methodology 
9. Hazardous events 
10. Raw risks 
11. Control measures 
12. Residual risks 
13. Significant risks 
14. Improvement plan link to risks 
15. Improvement plan details 
16. Operational monitoring plan 
17. Corrective action 
18. Compliance monitoring plan 
19. Internal auditing plan 
20. External auditing plan 
21. Consumer satisfaction monitoring plan 
22. SOPs – Normal 
23. SOPs – Incident 
24. SOPs – Emergency 
25. Supporting program description 
26. Supporting program plan 
10 27. Periodic review plan 
11 28. Revision plan 
WSP Index 60% 74% 

Note: Assumption 1 – All output indicators have a minimum score of 3.

Assumption 2 – All output indicators with readily available information were given a maximum possible score of 5.

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