Difference between drains and sewers
A drain is a pipe that serves only one building, conveying water and waste water away to a sewer. A lateral drain is a section of drain positioned outside the boundary of a building, connecting with the drains from other buildings to become a sewer.
Sewers (sewerage), are the underground networks of pipes that carry sewage (waste water and excrement), waste water and surface water run-off, from drains to treatment facilities or disposal points.
Property owners are responsible for the maintenance and repair of drains inside the boundaries of their property (unless the drains of other properties run through their property).
Since 2010, most private sewers and lateral drains that connect to the public sewer network are owned by the regulated sewerage companies.
Some buildings have drains that connect to a cesspool, septic tank or treatment plant rather than a sewer.
[edit] Related articles on Designing Buildings Wiki
- Cesspool.
- Drainage.
- Drains.
- Groundwater control in urban areas.
- Lateral drain.
- Maintenance of drainage systems to prevent flooding and water pollution.
- Manhole.
- Pipework.
- Private sewer.
- Public sewer.
- Rain gutter.
- Rainwater downpipe.
- Safe working in drains and sewers.
- Sewer construction.
- Sewerage.
- Sewerage company.
- Stink pipes.
- Sustainable urban drainage systems SUDS.
- Waste water.
- Water transfers and interconnections.
Featured articles and news
CIAT May 2026 briefing.
From medieval scribes to modern word art.
ECA welcomes crackdown on late payment and push for clean energy, whilst CIOB seek fixed cladding removal timeframes.
Cyber Security in the Built Environment
Protecting projects, data, and digital assets: A CIOB Academy TIS.
Managing competence in the built environment
ITFG publishes new industry guide on how to meet the ICC principles.
The UK's campaign to reduce noise pollution: Mythbusting, articles and topic guides.
Setting Expectations on Competence Management
Industry Competence Committee.
New Scottish and Welsh governments
CIOB stresses importance of construction after new parliament elections.
The sad story of Derby Hippodrome
An historic building left to decay.
ECA, JIB and JTL back Fabian Society call to invest in skills for a stronger built environment workforce.
Women's Contributions to the Built Environment.
Calls for the delayed Circular Economy Strategy
Over 50 leading businesses, trade associations and professional bodies, including CIAT, and UKGBC sign open letter.
The future workforce: culture change and skill
Under the spotlight at UK Construction Week London.
A landmark moment for postmodern heritage.



















