Regarding water, it is hard to study precipitation maps, etc and plan based on that with the new realities in unusual weather, droughts, floods etc attributed to climate change. What appears to be a perfect spot this year could be a disaster the next. Also, don't overlook govt, Corp, or military projects and instillations that could possibly have a negative impact or pollution issues: is there fracking nearby? Keystone Pipeline? Coal mining? SmartGrid infrastructure? It seems to be getting harder and harder to find land that won't be potentially ruined by something beyond your control.