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We had a well drilled on our plot a few years ago, and I saw firsthand how important it is to choose the location carefully. I agree with the recommendation about distances from contamination sources - it's really critical for water quality. But there's one thing that often gets overlooked: you need to consider where water from your roof will drain and where the groundwater flow originates on your property. If the well is downhill from your house or other structures, snowmelt in spring can seep through the soil and contaminate it directly.
Beyond elevation, pay attention to the geology of your plot. In some areas, groundwater is deeper, in others shallower, and it depends on the soil structure in your region. It's worth asking your neighbors about the depth of their wells or checking if the local administration has any information about the groundwater level. This affects not just the location, but also the drilling cost.
And one more thing - think about how easy it'll be for the drilling rig to access the site and whether you'll be able to service the well later without hassle. I think people often overlook this when they pick the furthest corner of the property. It's better to place it so water flows in the direction you need, but the equipment can still get there without any problems.
The main thing is to keep it far from the toilet, compost pit, and other pollution sources - at least 30-50 meters away :) It's best to place the well on higher ground so surface water doesn't run toward it, and away from the roots of large trees. If your property is on a slope, dig the well uphill relative to the house so groundwater flows away from it. And it's important to think about your neighbors too - the distance from their property should be decent so you don't end up with conflicts later.
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