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Agree on the point of the fact that the District would not want to fund the water for the garden as well as the hospital. Actually at some point in the future a dual supply might be the answer.

However – on the water quality issue – just to say that there is no guarantee that the groundwater in the area will be safe, particularly if the area is peri-urban and a lot will depend on the likely local contamination sources and the local geology. Equally, I agree that a well designed and installed solar system has huge advantages, it is just my core plea to not underestimate the maintenance costs of these systems – they may appear low at first, but when something fails or gets stolen the cost is high and often catches a small institution with limited resources (and by this I mean the clinic or for that matter the District Health office) off guard.

Any technology creates a whole host of financial, capacity and technical dependencies. This assessment should also specifically look at the reliability of supply and quality of supply of the utility network. This will allow you to reach to most appropriate decision. You may have seen this already, but you might find this a good read on the overall issues with respect to WASH in Health Care Facilities: https://www.who.int/water_sanitation_health/publications/wash-health-care-facilities/en/