Active Installers and Maintenance Providers


The active installers list shows the current list of installers with basic and/or combination licenses. A basic license is required to install a septic-tank system. A combination license is required to install an aerobic treatment unit (ATU).

Click here for the most current active installers list (updated May 12, 2023).

Any individual sewage treatment system requires proper routine maintenance. Your installer should provide you with a maintenance contract as part of your initial installation and homeowners are required to maintain their systems in perpetuity (for as long as they occupy the dwelling in question). LDH also maintains a list of installers with active endorsements from a system manufacturer. You should choose a maintenance provider who has an endorsement for the type of system that is installed at your residence.

Click here for the most current active maintenance providers list (updated May 12, 2023).