These include: Sizing the tank Construction Inlet and Outlet Baffles Access Holes Holding Tanks Pumping Stations Sewage Pumps Pump Controls Soil Absorption Systems We specialize in Septic Inspections for Real Estate Transactions. The Groundwater Discharges Section maintains a list of approved septic system productsand lists approved innovative and alternative systems that might be usedwhere site constraints limit the ability to install conventional wastewater treatment systems. State Agencies An on-site wastewater treatment and disposal system - known commonly as a septic system - is a wastewater treatment facility located within your property boundaries that collects, treats and disposes of wastewater from your home or business.