I am not a big supporter of those who think they can bug out to the country and live off the land. Here is another reason - acidic water that contains heavy metals. Here is a map of Colorado showing where it is located. http://geosurvey.state.co.us/water/Acid Water Natural/Pages/ImageGallery.aspx The heavy metals in the water is naturally occurring and you can not filter them out. More info here http://www.freedrinkingwater.com/water-education/quality-water-ph-page2.htm What you need to do is test the water with this. [ame="http://www.amazon.com/ColorpHast-9578-0001-Test-Strips-2-9-0/dp/B003TV3GNK/ref=sr_1_2?s=industrial&ie=UTF8&qid=1340238147&sr=1-2"]Amazon.com: ColorpHast 9578-0001 Test Strips, 2-9.0 pH (Box of 100): Industrial & Scientific@@AMEPARAM@@http://ecx.images-amazon.com/images/I/51BDEA5FcZL.@@AMEPARAM@@51BDEA5FcZL[/ame] If lower then 6.5 or higher then 8.5 - do not drink the water.