How do I know if my house is on sewer or septic?

The Engineering Department maintains sewer maps which show the locations of Town sewer mains.  However, the maps do not show individual house connections.  The Building Department may have plans for your property which show the installation of sewer service.  Further, the Westchester County Department of Health maintains records of properties within the County which are on septic.  Contact the Department of Health at 914-813-5000 for confirmation for your property.