A boil water advisory is still in effect for some areas of Delaware County, Pennsylvania, following a water main break in Upper Chichester. The advisory was issued after the break disrupted water service, and officials are keeping it in place as a precaution to ensure water safety. Residents are advised to boil their water before drinking, cooking, brushing teeth, and washing dishes to eliminate any potential contaminants. Bringing water to a rolling boil for at least one minute will kill most harmful bacteria and viruses.