Waste water treatment works: treatment, monitoring and compliance limits

Find out the compliance limits for waste water treatment works (WWTW), and how to treat and monitor discharges to meet permit conditions.



This guide is for operators of WWTW with environmental permits for water discharge activities or point source groundwater activities.

WWTW collect and treat sewage. This guide explains the:

  • level of treatment WWTW must provide
  • numeric compliance limits that define the treatment’s effectiveness
  • monitoring and reporting required to assess compliance with the limits

This guide sets out what you need to do to meet the requirements of the Urban Waste Water Treatment Regulations.

Published 8 May 2018