Environmental guidance for your business in Northern Ireland & Scotland

Excavating and installing pipework on a construction site

Installing pipework and sewage systems on construction sites

If your business installs and maintains sewerage systems such as sewers, drains and septic tanks, you may carry out activities such as excavating and installing pipework. These could have a significant impact on the environment.

What you must do

If your business installs septic tanks, cesspools or package treatment plants read the pollution prevention guidance on treatment and disposal of sewage where no public foul sewer is available (GPP 4).

GPP 4 provides guidance on:

  • selecting the best option for treatment and disposal
  • calculating the right size for the sewage treatment system
  • operating and maintaining the sewage treatment system
  • consent and land use planning requirements.

 GPP4 Disposal of sewage where no foul sewer is available

Read our guidance on installing septic tanks.

Septic Tanks

Further information

Northern Ireland Water: Sewer adoption (new development)

Scottish Water: Guide for obtaining new water and waste water services (Adobe PDF - 209KB)

In Scotland, you can also purchase the second edition of Sewers for Scotland. For further information, see the WRC website.

Scottish Water: Sewers for Scotland, third edition

Whats new on NetRegs

  • Waste – Duty of Care Roles and Responsibilities

    The Northern Ireland Environment Agency has published a short guide to the duty of care responsibilities including advice and information for waste producers, carriers and those accepting, storing and treating waste.



  • EIA (Agriculture) Regulations for Northern Ireland

    Any person intending to alter the use or management of areas of uncultivated or semi-natural land must obtain prior approval from the Department of Agriculture, Environment and Rural Affairs (DAERA).

    Read more on the DAERA website

  • Guidance from your environmental regulator

    Regulator logos

  • 9 NEW GPPs (Guidance for Pollution Prevention) available now

    The NetRegs team at SEPA, in partnership with The Northern Ireland Environment Agency, Natural Resources Wales and a number of industry bodies have produced 9 new GPPs to replace out of date PPGs. More are coming! Check the available topics

  • New guidance

    New guidance for Start-ups, charities and community projects


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