Corroded pipes can contaminate your home pipes. But it can be hard to tell if your pipes are corroded, since they rarely leave a distinctive color when you take a shower or wash the dishes or your hands. One way to tell if your pipes need an inspection is to simply run a load of white laundry, like white towels and T-shirts, in the washing machine. Don't add any laundry detergent or bleach, and run it on the warm cycle so both cold and hot water are used. Then look at the clothes. Are there any new stains? Any discoloration (even the slightest) is a sign your pipes and water should be tested.