Household Sewage Treatment Systems for any home that is not serviced by a public sanitary sewer/ Residents must connect to a sanitary sewer if one is to become available. Otherwise, residents must have a HSTS that is properly functioning and not creating a nuisance. Anyone working on an septic must be registered. The Environmental Division of The Carroll County General Health District is responsible for site evaluations for household sewage treatment systems and site evaluations for private water systems. We provide permits, approvals and inspection of the following