[quote author=badbread link=topic=5618.msg70465#msg70465 date=1229642445]
Hrm, no idea. I think things like household piping, street piping, etc... may contribute to your TDS reading as well. Your welcome to borrow my meter if you'd like. Let me know.
[/quote]
That is HUGE factor depending on where you live in the city, how old the building is, how old the street system is, etc.