When I rub the balloon against my hair, the balloon becomes negatively charged on the side that was in contact with my hair. Water is a polar molecule, meaning that it has a negative side and a positive side. The oxygen side becomes more negative and the hydrogen becomes more positive. When the negatively charged balloon is brought near the stream of water, it deflects the negative side of the water molecules. These molecules are repelled causing the stream to deflect away from the balloon. The water also looks like it is attracted to the balloon at times and this is because the positive side of the water molecule is becoming attracted to the negative balloon. Opposites attract and likes repel.
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