according to the good folks in austin, each municapality has the authority to "make the water pottable". our water comes from lakes, and the lakes around here are very alkaline, in fact salty. we grow shrimp in them. and yes i have if the color is yellow it is good. i will test this evening and let you know what the readings are. this is west texas as close to the mexican border as you can get. water is not important as oil....and we have an abundant supply of it the refineries cannot take anymore so the wells for the most part are not producing right now.