A boil water advisory is a public notice that the tap water has become unsafe to consume for a variety of reasons, including E. coli contaminations or burst water mains. Sometimes, it takes days for officials to notify the public that the water is unsafe. Notices are distributed in different ways, including a knock on the door or a phone call.

The following list only includes boil water advisories reported online by major media outlets. A lack of an advisory doesn’t mean your tap water is safe. There are all kinds of contaminants found widely in tap water, according to EPA data. Look up your tap water here.