Understand the Terms. Protect Your Property.
At Kentucky Septic Professionals, we believe in transparency and education. Whether you’re buying a home, repairing a failed system, or scheduling a sewer scope inspection, it helps to understand the language used by inspectors and contractors. Below is a glossary of commonly used terms in the septic and sewer industry — explained in plain English.
Absorption Field (Drain Field)
A system of perforated pipes or chambers buried in the ground that disperse treated wastewater from the septic tank into the surrounding soil.
Aerobic Treatment Unit (ATU)
A type of septic system that introduces air into the treatment tank to promote the growth of oxygen-loving bacteria. These systems break down waste more efficiently and are often used where soil conditions are poor.
Baffle
A barrier inside the septic tank that directs the flow of wastewater and helps prevent solids from exiting the tank and entering the drain field.
Backflow
The unwanted reversal of wastewater flow, which can lead to sewage backing up into your home or property.
Camera (Sewer Scope) Inspection
A non-invasive method of inspecting underground sewer lines using a high-resolution camera. It helps identify clogs, cracks, root intrusion, and other issues inside pipes
Cesspool
An older wastewater system where sewage is stored in a pit and gradually seeps into the soil. These are outdated and no longer allowed in most areas.
Distribution Box (D-Box)
A small concrete or plastic box that evenly distributes effluent from the septic tank to the drain field lines.
Effluent
The liquid wastewater that flows out of the septic tank and into the drain field after solids have settled.
Float Switch
A device inside a pump tank or dosing tank that detects the water level and turns the pump on or off accordingly.
Grease Trap
A plumbing device used to capture grease and oil from kitchens before it enters the septic system. Typically found in commercial kitchens or food service operations.
Hydraulic Load
The amount of wastewater a septic system is expected to handle. Too much flow can overwhelm the system and cause backups or drain field failure.
Infiltrator Chambers
A type of modern drain field design that uses open-bottom plastic chambers instead of gravel-filled trenches, offering faster installation and efficient wastewater dispersion.
Lateral Lines
The pipes that extend from the distribution box into the drain field. These lines spread effluent evenly across the field for absorption.
Leach Field (Drain Field)
See: Absorption Field. It’s the final treatment and dispersal point for septic system effluent.
Manhole Cover
A removable cover on top of a septic tank that allows for pumping, inspection, and maintenance access.
Percolation Test (Perc Test)
A soil test performed to determine how quickly water drains through the soil. It’s required before installing a septic system.
Root Intrusion
The invasion of tree or plant roots into sewer or septic lines, which can cause cracks, clogs, and backups.
Scum Layer
The layer of grease, fats, and lighter materials that float to the top of the septic tank.
Sediment
Solid particles that settle at the bottom of a septic tank or sewer line. Excess sediment can lead to clogs or reduce system efficiency.
Septic Tank
A watertight, underground container that holds wastewater long enough for solids to settle and scum to float, before releasing liquid effluent to the drain field.
Septic Pump
A motorized pump used to move effluent from a septic tank to a higher elevation or a mound system, especially in areas with poor gravity flow.
Sewer Cleanout
An access point in a sewer line (usually near the house) that allows plumbers to remove blockages or perform inspections.
Sewer Gas
A mixture of gases produced by decomposing waste in sewer or septic systems. Smells foul and may be dangerous if leaking indoors.
Sewer Scope Inspection
A diagnostic inspection using a camera to visually assess the condition of the main sewer line from the house to the city connection or septic system.
Sludge
The solid waste that settles at the bottom of a septic tank. This layer must be pumped out regularly to prevent tank overflow.
Sump Pump (Sewage Ejector Pump)
Used to pump wastewater from lower elevations to the septic or sewer line. Common in basements or low-lying areas.
Vent Stack
A vertical pipe that allows sewer gases to escape and air to enter the plumbing system to help drainage flow properly.
Tank Lid Riser
An extension that brings the septic tank lid to ground level, making pumping and inspection easier and safer.
Have More Questions?
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