Generally speaking, if your water tastes good, it's fine for extract brewing.
So, if the water tastes foul, buy some bottled water. If it tastes great, use it. If it tastes good, but with chlorine, either boil it to get rid of the chlorine, or buy bottled water. Chloramines, which replace chlorine in many areas, don't boil off so you have to either treat the water with potassium metabisulfite, or buy bottled water.
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Broken Leg Brewery
Giving beer a leg to stand on since 2006
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