So the TDS coming out of your tap must also depend on where its going between the plant and your faucet. How old and type of pipes your using must have a lot to do with it as well because the readings from house to house in the same areas are all a bit different.
I still have yet to ever test over 11 in my new condo but in my last place (only about 10 blocks away) the numbers were significantly higher (more in the 20's).
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