Many people will have the question, do the three mean the same thing: sewer, sewerage and sewage? Professionals know the difference and how they are used in commercial and residential services. Most of the waste produced by humans on a daily basis actually needs to be treated and recycled. Our daily activities of bathing, brushing our teeth, watering plants, eating and drinking, etc. all produce waste. Septic tanks provide on-site wastewater treatment by allowing solids to settle and organic matter to undergo partial decomposition. The treated effluent typically flows to a soil absorption system or another approved treatment facility, while accumulated septage is periodically removed for appropriate treatment or disposal. Next you will learn the difference between the three types of sewer, sewerage and sewage.
What is sewer?
The sewage produced by our life is discharged into the sewer through pipes, which can be understood as sewer.
From an engineering perspective, the choice of Sewer material is critical for long-term durability. Sewer pipes can be constructed from materials such as HDPE, PVC, concrete, and ductile iron. Material selection depends on factors including chemical compatibility, operating pressure, structural loads, corrosion resistance, installation conditions, and expected service life. Proper material selection, joint design, installation, and maintenance help reduce leakage risks and protect surrounding soil and groundwater.
What Is sewage?
In earlier times, sewage was often discharged into rivers, lakes or oceans without water treatment, leaving the decomposition of human excrement to the ecosystem. Nowadays, the term “sewage” refers to the liquid or waste that is usually carried away by sewers.
Sewage is a type of wastewater that generally includes water and waste materials discharged from residential, commercial, and certain industrial sources. Although the terms sewage and wastewater are sometimes used interchangeably, wastewater is a broader term that also includes industrial process wastewater and other used water streams. Domestic wastewater refers mainly to wastewater from household activities, while municipal wastewater may include domestic, commercial, and permitted industrial discharges.
Wastewater usually enters the sewer from a pipe, takes it elsewhere, or enters an on-site wastewater treatment facility. Whether or not it combines with surface runoff in the sewer depends on the design of the sewer.
What Is sewerage?
The term “sewerage” refers to the provision of drainage through a sewer. Sewerage refers to the infrastructure used to collect and convey sewage, typically including sewer pipes, manholes, pumping stations, and related facilities. Depending on the system design, sanitary sewers carry wastewater, storm sewers carry stormwater runoff, and combined sewers carry both wastewater and stormwater through the same network. It includes components such as receiving drains, manholes, pumping stations, stormwater overflows and screening chambers for combined sewers or domestic sewers.
Sewage collected through a sewerage network is typically transported to a wastewater treatment plant, where pollutants are removed before the treated effluent is discharged or reused in accordance with applicable standards. A sewerage system may include pipes, inspection chambers, manholes, and pumping stations. In some definitions, the term also encompasses treatment and disposal facilities.
Difference Between Sewer, Sewage and Sewerage
| Term | Definition | Main Function |
| Sewer | A pipe or conduit designed to transport wastewater or stormwater | Conveys wastewater or runoff |
| Sewage | Wastewater and waste materials from domestic, commercial, and certain industrial sources | The waste stream being transported |
| Sewerage | The infrastructure used for sewage collection and conveyance, sometimes including treatment and disposal facilities | Collects and transports sewage for treatment or disposal |
Conclusion
In summary, a sewer is a pipe or conduit that carries wastewater, sewage is the wastewater and waste material being transported, and sewerage refers to the infrastructure used to collect and convey sewage. Understanding these differences helps clarify how wastewater moves from its source to treatment facilities. Proper wastewater management may involve solids separation, biological treatment, filtration, and disinfection, depending on the wastewater characteristics and treatment objectives.