It may be a Christian charity or have some kind of association with it...
The WaterAid organisation does not state that it is non-religious in its mission statement.
This is what is spotted on the company's faith groups page - Fundraising case studies include only Churches.
This certainly indicate something...
Answer
This charity does not help people dig wells and manage them: they influence local leaders and governments, provide management support and education. Check the site before you donate.
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