Necessary Coverage for Sewer & Septic Tank Installers | More than 21 million American households use septic tanks instead of public sewers, according to 2015 data from Circle of Blue. With that many people utilizing them, it’s important that they are designed, installed and maintained properly. And just like any other business, sewer and septic tank installers need coverage from the hazards in their field. Septic tanks are used to safely get rid of waste; those that install these tanks have to be certified professionals to do it with the right protections in place.