Louisville Water Company has issued a Boil Water Advisory for approximately 330 customers in the southern part of Jefferson County and parts of Bullitt County who are served by the Jefferson Memorial and Martin Hill elevated tanks.The advisory comes after a drop in pressure. Customers should bring all water used for drinking, food preparation and cooking to a rolling boil for three minutes before consuming.Don't use chilled water lines on refrigerators or ice from automatic ice machines.A map of the affected area ishere.