I've been having similar questions regarding water reports: I went to the Fort Worth, Tx City's website and viewed the annual water report. They have not posted 2010 or 2011 yet. They have posted 2009 and earlier. So, I have a couple of questions: Can you assume that the water is relatively consistent from year to year? Second, the water report lists ranges: Bicarb 95-117, Mg: 3-10, Ca: 139-156, Alkalinity as CaCO3: 95-119, Hardness as CaCO3: 90-169. Can you adequately adjust your water based on these ranges?