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Firstly, do a sanitary survey before siting the borehole and after construction. Sanitary surveys are a good way to engage the community.

Secondly, ensure adequate post construction disinfection.

Thirdly, consider third party testing, perhaps with the local District Water Officer. This would be a good hand-over check

Fourthly, leave a few copies of the sanitary survey forms for the users to check.

Lastly, the most expensive part of the water testing is not the kit! It's qualified staff and the logistics of getting there! Use a good kit but this is just QA for the sanitary surveys