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Table 1

Risk score and bacteriological contamination before and after cleaning

Risk score of wells before (n = 2,348) and after cleaning (n = 2,380)
Bacteriological contamination
Low riskIntermediate riskHigh riskVery high riskNot contaminatedContaminated
Before cleaning 0% 2% 17% 81% 15% 85% 
After cleaning 88% 12% 0% 0% 80% 20% 
Risk score of wells before (n = 2,348) and after cleaning (n = 2,380)
Bacteriological contamination
Low riskIntermediate riskHigh riskVery high riskNot contaminatedContaminated
Before cleaning 0% 2% 17% 81% 15% 85% 
After cleaning 88% 12% 0% 0% 80% 20% 
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