Waterborne(2005)

Heera Bhatti, an American-Sikh, runs a corner store in Los Angeles with the help of her son, Vikram, and Gulu. She does not approve of Vikram's Caucasian girlfriend, Lillian, and would prefer that Vikram marry a Punjabi girl, but Vikram has made up his mind. Then the lives of all Californians are turned upside down when one morning eight people are dead after drinking contaminated tap water.